diff --git a/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/DemoTasks/KeepAliveMQTTExample.c b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/DemoTasks/KeepAliveMQTTExample.c
new file mode 100644
index 0000000000..d6df5f9227
--- /dev/null
+++ b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/DemoTasks/KeepAliveMQTTExample.c
@@ -0,0 +1,954 @@
+/*
+ * FreeRTOS Kernel V10.3.0
+ * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ */
+
+/*
+ * Demo for showing use of the managed MQTT API.
+ *
+ * The Example shown below uses this API to create MQTT messages and
+ * send them over the connection established using FreeRTOS sockets.
+ * The example is single threaded and uses statically allocated memory;
+ * it uses QOS0 and therefore does not implement any retransmission
+ * mechanism for Publish messages.
+ *
+ * !!! NOTE !!!
+ * This MQTT demo does not authenticate the server nor the client.
+ * Hence, this demo should not be used as production ready code.
+ */
+
+/* Standard includes. */
+#include <string.h>
+#include <stdio.h>
+
+/* Kernel includes. */
+#include "FreeRTOS.h"
+#include "task.h"
+
+/* FreeRTOS+TCP includes. */
+#include "FreeRTOS_IP.h"
+#include "FreeRTOS_Sockets.h"
+
+/* Demo Specific configs. */
+#include "demo_config.h"
+
+/* MQTT library includes. */
+#include "core_mqtt.h"
+
+/* Retry utilities include. */
+#include "retry_utils.h"
+
+/* Transport interface include. */
+#include "plaintext_freertos.h"
+
+/*-----------------------------------------------------------*/
+
+/* Compile time error for undefined configs. */
+#ifndef democonfigMQTT_BROKER_ENDPOINT
+ #error "Define the config democonfigMQTT_BROKER_ENDPOINT by following the instructions in file demo_config.h."
+#endif
+
+/*-----------------------------------------------------------*/
+
+/* Default values for configs. */
+#ifndef democonfigCLIENT_IDENTIFIER
+
+/**
+ * @brief The MQTT client identifier used in this example. Each client identifier
+ * must be unique so edit as required to ensure no two clients connecting to the
+ * same broker use the same client identifier.
+ *
+ * @note Appending __TIME__ to the client id string will reduce the possibility of a
+ * client id collision in the broker. Note that the appended time is the compilation
+ * time. This client id can cause collision, if more than one instance of the same
+ * binary is used at the same time to connect to the broker.
+ */
+ #define democonfigCLIENT_IDENTIFIER "testClient"__TIME__
+#endif
+
+#ifndef democonfigMQTT_BROKER_PORT
+
+/**
+ * @brief The port to use for the demo.
+ */
+ #define democonfigMQTT_BROKER_PORT ( 1883 )
+#endif
+
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Timeout for receiving CONNACK packet in milliseconds.
+ */
+#define mqttexampleCONNACK_RECV_TIMEOUT_MS ( 1000U )
+
+/**
+ * @brief The topic to subscribe and publish to in the example.
+ *
+ * The topic name starts with the client identifier to ensure that each demo
+ * interacts with a unique topic name.
+ */
+#define mqttexampleTOPIC democonfigCLIENT_IDENTIFIER "/example/topic"
+
+/**
+ * @brief The number of topic filters to subscribe.
+ */
+#define mqttexampleTOPIC_COUNT ( 1 )
+
+/**
+ * @brief The MQTT message published in this example.
+ */
+#define mqttexampleMESSAGE "Hello World!"
+
+/**
+ * @brief Dimensions a file scope buffer currently used to send and receive MQTT data
+ * from a socket.
+ */
+#define mqttexampleSHARED_BUFFER_SIZE ( 500U )
+
+/**
+ * @brief Time to wait between each cycle of the demo implemented by prvMQTTDemoTask().
+ */
+#define mqttexampleDELAY_BETWEEN_DEMO_ITERATIONS ( pdMS_TO_TICKS( 5000U ) )
+
+/**
+ * @brief Timeout for MQTT_ReceiveLoop in milliseconds.
+ */
+#define mqttexampleRECEIVE_LOOP_TIMEOUT_MS ( 500U )
+
+/**
+ * @brief Keep alive time reported to the broker while establishing an MQTT connection.
+ *
+ * It is the responsibility of the Client to ensure that the interval between
+ * Control Packets being sent does not exceed the this Keep Alive value. In the
+ * absence of sending any other Control Packets, the Client MUST send a
+ * PINGREQ Packet.
+ */
+#define mqttexampleKEEP_ALIVE_TIMEOUT_SECONDS ( 60U )
+
+/**
+ * @brief Time to wait before sending ping request to keep MQTT connection alive.
+ *
+ * A PINGREQ is attempted to be sent at every ( #mqttexampleKEEP_ALIVE_TIMEOUT_SECONDS / 4 )
+ * seconds. This is to make sure that a PINGREQ is always sent before the timeout
+ * expires in broker.
+ */
+#define mqttexampleKEEP_ALIVE_DELAY ( pdMS_TO_TICKS( ( ( mqttexampleKEEP_ALIVE_TIMEOUT_SECONDS / 4 ) * 1000 ) ) )
+
+/**
+ * @brief Delay between MQTT publishes. Note that the receive loop also has a
+ * timeout, so the total time between publishes is the sum of the two delays. The
+ * keep-alive delay is added here so the keep-alive timer callback executes.
+ */
+#define mqttexampleDELAY_BETWEEN_PUBLISHES ( mqttexampleKEEP_ALIVE_DELAY + pdMS_TO_TICKS( 500U ) )
+
+/**
+ * @brief Transport timeout in milliseconds for transport send and receive.
+ */
+#define mqttexampleTRANSPORT_SEND_RECV_TIMEOUT_MS ( 200U )
+
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief A PINGREQ packet is always 2 bytes in size, defined by MQTT 3.1.1 spec.
+ */
+#define MQTT_PACKET_PINGREQ_SIZE ( 2U )
+
+/*-----------------------------------------------------------*/
+
+#define _MILLISECONDS_PER_SECOND ( 1000U ) /**< @brief Milliseconds per second. */
+#define _MILLISECONDS_PER_TICK ( _MILLISECONDS_PER_SECOND / configTICK_RATE_HZ ) /**< Milliseconds per FreeRTOS tick. */
+
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief The task used to demonstrate the MQTT API.
+ *
+ * @param[in] pvParameters Parameters as passed at the time of task creation. Not
+ * used in this example.
+ */
+static void prvMQTTDemoTask( void * pvParameters );
+
+/**
+ * @brief Connect to MQTT broker with reconnection retries.
+ *
+ * If connection fails, retry is attempted after a timeout.
+ * Timeout value will exponentially increase until maximum
+ * timeout value is reached or the number of attempts are exhausted.
+ *
+ * @param pxNetworkContext The output parameter to return the created network context.
+ *
+ * @return The status of the final connection attempt.
+ */
+static PlaintextTransportStatus_t prvConnectToServerWithBackoffRetries( NetworkContext_t * pxNetworkContext );
+
+/**
+ * @brief Sends an MQTT Connect packet over the already connected TCP socket.
+ *
+ * @param pxMQTTContext MQTT context pointer.
+ * @param pxNetworkContext Network context.
+ *
+ */
+static void prvCreateMQTTConnectionWithBroker( MQTTContext_t * pxMQTTContext,
+ NetworkContext_t * pxNetworkContext );
+
+/**
+ * @brief Function to update variable #xGlobalSubAckStatus with status
+ * information from Subscribe ACK. Called by the event callback after processing
+ * an incoming SUBACK packet.
+ *
+ * @param Server response to the subscription request.
+ */
+static void prvUpdateSubAckStatus( MQTTPacketInfo_t * pxPacketInfo );
+
+/**
+ * @brief Subscribes to the topic as specified in mqttexampleTOPIC at the top of
+ * this file. In the case of a Subscribe ACK failure, then subscription is
+ * retried using an exponential backoff strategy with jitter.
+ *
+ * @param pxMQTTContext MQTT context pointer.
+ */
+static void prvMQTTSubscribeWithBackoffRetries( MQTTContext_t * pxMQTTContext );
+
+/**
+ * @brief Publishes a message mqttexampleMESSAGE on mqttexampleTOPIC topic.
+ *
+ * @param pxMQTTContext MQTT context pointer.
+ */
+static void prvMQTTPublishToTopic( MQTTContext_t * pxMQTTContext );
+
+/**
+ * @brief Unsubscribes from the previously subscribed topic as specified
+ * in mqttexampleTOPIC.
+ *
+ * @param pxMQTTContext MQTT context pointer.
+ */
+static void prvMQTTUnsubscribeFromTopic( MQTTContext_t * pxMQTTContext );
+
+/**
+ * @brief The timer query function provided to the MQTT context.
+ *
+ * @return Time in milliseconds.
+ */
+static uint32_t prvGetTimeMs( void );
+
+/**
+ * @brief Process a response or ack to an MQTT request (PING, SUBSCRIBE
+ * or UNSUBSCRIBE). This function processes PINGRESP, SUBACK, UNSUBACK
+ *
+ * @param pxIncomingPacket is a pointer to structure containing deserialized
+ * MQTT response.
+ * @param usPacketId is the packet identifier from the ack received.
+ */
+static void prvMQTTProcessResponse( MQTTPacketInfo_t * pxIncomingPacket,
+ uint16_t usPacketId );
+
+/**
+ * @brief Process incoming Publish message.
+ *
+ * @param pxPublishInfo is a pointer to structure containing deserialized
+ * Publish message.
+ */
+static void prvMQTTProcessIncomingPublish( MQTTPublishInfo_t * pxPublishInfo );
+
+/**
+ * @brief Check if the amount of time waiting for PINGRESP has exceeded
+ * the specified timeout, then reset the keep-alive timer.
+ *
+ * This should only be called after a control packet has been sent.
+ *
+ * @param pxTimer The auto-reload software timer for handling keep alive.
+ *
+ * @return The status returned by #xTimerReset.
+ */
+static BaseType_t prvCheckTimeoutThenResetTimer( TimerHandle_t pxTimer );
+
+/**
+ * @brief This callback is invoked through an auto-reload software timer.
+ *
+ * Its responsibility is to send a PINGREQ packet if a PINGRESP is not pending
+ * and no control packets have been sent after some given interval.
+ *
+ * @param pxTimer The auto-reload software timer for handling keep alive.
+ */
+static void prvKeepAliveTimerCallback( TimerHandle_t pxTimer );
+
+/**
+ * @brief The application callback function for getting the incoming publish
+ * and incoming acks reported from the MQTT library.
+ *
+ * @param pxMQTTContext MQTT context pointer.
+ * @param pxPacketInfo Packet Info pointer for the incoming packet.
+ * @param pxDeserializedInfo Deserialized information from the incoming packet.
+ */
+static void prvEventCallback( MQTTContext_t * pxMQTTContext,
+ MQTTPacketInfo_t * pxPacketInfo,
+ MQTTDeserializedInfo_t * pxDeserializedInfo );
+
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Static buffer used to hold MQTT messages being sent and received.
+ */
+static uint8_t ucSharedBuffer[ mqttexampleSHARED_BUFFER_SIZE ];
+
+/**
+ * @brief Static buffer used to hold PINGREQ messages to be sent.
+ */
+static uint8_t ucPingReqBuffer[ MQTT_PACKET_PINGREQ_SIZE ];
+
+/**
+ * @brief Global entry time into the application to use as a reference timestamp
+ * in the #prvGetTimeMs function. #prvGetTimeMs will always return the difference
+ * between the current time and the global entry time. This will reduce the chances
+ * of overflow for the 32 bit unsigned integer used for holding the timestamp.
+ */
+static uint32_t ulGlobalEntryTimeMs;
+
+/**
+ * @brief Packet Identifier generated when Subscribe request was sent to the broker;
+ * it is used to match received Subscribe ACK to the transmitted ACK.
+ */
+static uint16_t usSubscribePacketIdentifier;
+
+/**
+ * @brief Packet Identifier generated when Unsubscribe request was sent to the broker;
+ * it is used to match received Unsubscribe response to the transmitted unsubscribe
+ * request.
+ */
+static uint16_t usUnsubscribePacketIdentifier;
+
+/**
+ * @brief A pair containing a topic filter and its SUBACK status.
+ */
+typedef struct topicFilterContext
+{
+ const char * pcTopicFilter;
+ MQTTSubAckStatus_t xSubAckStatus;
+} topicFilterContext_t;
+
+/**
+ * @brief An array containing the context of a SUBACK; the SUBACK status
+ * of a filter is updated when the event callback processes a SUBACK.
+ */
+static topicFilterContext_t xTopicFilterContext[ mqttexampleTOPIC_COUNT ] =
+{
+ { mqttexampleTOPIC, MQTTSubAckFailure }
+};
+
+/**
+ * @brief Timer to handle the MQTT keep-alive mechanism.
+ */
+static TimerHandle_t xKeepAliveTimer;
+
+/**
+ * @brief Storage space for xKeepAliveTimer.
+ */
+static StaticTimer_t xKeepAliveTimerBuffer;
+
+/**
+ * @brief Set to true when PINGREQ is sent then false when PINGRESP is received.
+ */
+static volatile bool xWaitingForPingResp = false;
+
+/**
+ * @brief The last time when a PINGREQ was sent over the network.
+ */
+static uint32_t ulPingReqSendTimeMs;
+
+/**
+ * @brief Timeout for a pending PINGRESP from the MQTT broker.
+ */
+static uint32_t ulPingRespTimeoutMs = ( mqttexampleKEEP_ALIVE_TIMEOUT_SECONDS / 4 ) * _MILLISECONDS_PER_SECOND;
+
+/**
+ * @brief Static buffer used to hold an MQTT PINGREQ packet for keep-alive mechanism.
+ */
+const static MQTTFixedBuffer_t xPingReqBuffer =
+{
+ .pBuffer = ucPingReqBuffer,
+ .size = MQTT_PACKET_PINGREQ_SIZE
+};
+
+/** @brief Static buffer used to hold MQTT messages being sent and received. */
+static MQTTFixedBuffer_t xBuffer =
+{
+ .pBuffer = ucSharedBuffer,
+ .size = mqttexampleSHARED_BUFFER_SIZE
+};
+
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Create the task that demonstrates the Plain text MQTT API Demo.
+ */
+void vStartSimpleMQTTDemo( void )
+{
+ /* This example uses a single application task, which in turn is used to
+ * connect, subscribe, publish, unsubscribe and disconnect from the MQTT
+ * broker. */
+ xTaskCreate( prvMQTTDemoTask, /* Function that implements the task. */
+ "MQTTDemo", /* Text name for the task - only used for debugging. */
+ democonfigDEMO_STACKSIZE, /* Size of stack (in words, not bytes) to allocate for the task. */
+ NULL, /* Task parameter - not used in this case. */
+ tskIDLE_PRIORITY, /* Task priority, must be between 0 and configMAX_PRIORITIES - 1. */
+ NULL ); /* Used to pass out a handle to the created task - not used in this case. */
+}
+/*-----------------------------------------------------------*/
+
+static void prvMQTTDemoTask( void * pvParameters )
+{
+ uint32_t ulPublishCount = 0U, ulTopicCount = 0U;
+ const uint32_t ulMaxPublishCount = 5UL;
+ NetworkContext_t xNetworkContext = { 0 };
+ MQTTContext_t xMQTTContext;
+ MQTTStatus_t xMQTTStatus;
+ PlaintextTransportStatus_t xNetworkStatus;
+ BaseType_t xTimerStatus;
+
+ /* Remove compiler warnings about unused parameters. */
+ ( void ) pvParameters;
+
+ ulGlobalEntryTimeMs = prvGetTimeMs();
+
+ /* Serialize a PINGREQ packet to send upon invoking the keep-alive timer
+ * callback. */
+ xMQTTStatus = MQTT_SerializePingreq( &xPingReqBuffer );
+ configASSERT( xMQTTStatus == MQTTSuccess );
+
+ for( ; ; )
+ {
+ /****************************** Connect. ******************************/
+
+ /* Attempt to connect to the MQTT broker. If connection fails, retry after
+ * a timeout. Timeout value will be exponentially increased until the maximum
+ * number of attempts are reached or the maximum timeout value is reached.
+ * The function returns a failure status if the TCP connection cannot be
+ * established to the broker after the configured number of attempts. */
+ xNetworkStatus = prvConnectToServerWithBackoffRetries( &xNetworkContext );
+ configASSERT( xNetworkStatus == PLAINTEXT_TRANSPORT_SUCCESS );
+
+ /* Sends an MQTT Connect packet over the already connected TCP socket,
+ * and waits for connection acknowledgment (CONNACK) packet. */
+ LogInfo( ( "Creating an MQTT connection to %s.\r\n", democonfigMQTT_BROKER_ENDPOINT ) );
+ prvCreateMQTTConnectionWithBroker( &xMQTTContext, &xNetworkContext );
+
+ /* Create an auto-reload timer to handle keep-alive. */
+ xKeepAliveTimer = xTimerCreateStatic( "KeepAliveTimer",
+ mqttexampleKEEP_ALIVE_DELAY,
+ pdTRUE,
+ ( void * ) &xMQTTContext.transportInterface,
+ prvKeepAliveTimerCallback,
+ &xKeepAliveTimerBuffer );
+ configASSERT( xKeepAliveTimer );
+
+ /* Start the timer for keep alive. */
+ xTimerStatus = xTimerStart( xKeepAliveTimer, 0 );
+ configASSERT( xTimerStatus == pdPASS );
+
+ /**************************** Subscribe. ******************************/
+
+ /* If server rejected the subscription request, attempt to resubscribe to
+ * topic. Attempts are made according to the exponential backoff retry
+ * strategy implemented in retryUtils. */
+ prvMQTTSubscribeWithBackoffRetries( &xMQTTContext );
+
+ /********************* Publish and Receive Loop. **********************/
+ /* Publish messages with QOS0, send and process Keep alive messages. */
+ for( ulPublishCount = 0; ulPublishCount < ulMaxPublishCount; ulPublishCount++ )
+ {
+ LogInfo( ( "Publish to the MQTT topic %s.\r\n", mqttexampleTOPIC ) );
+ prvMQTTPublishToTopic( &xMQTTContext );
+
+ /* Process incoming publish echo, since application subscribed to the
+ * same topic the broker will send publish message back to the
+ * application. */
+ LogInfo( ( "Attempt to receive publish message from broker.\r\n" ) );
+ xMQTTStatus = MQTT_ReceiveLoop( &xMQTTContext, mqttexampleRECEIVE_LOOP_TIMEOUT_MS );
+ configASSERT( xMQTTStatus == MQTTSuccess );
+
+ /* Leave Connection Idle for some time. */
+ LogInfo( ( "Keeping Connection Idle...\r\n\r\n" ) );
+ vTaskDelay( mqttexampleDELAY_BETWEEN_PUBLISHES );
+ }
+
+ /******************** Unsubscribe from the topic. *********************/
+ LogInfo( ( "Unsubscribe from the MQTT topic %s.\r\n", mqttexampleTOPIC ) );
+ prvMQTTUnsubscribeFromTopic( &xMQTTContext );
+
+ /* Process Incoming packet from the broker. */
+ xMQTTStatus = MQTT_ReceiveLoop( &xMQTTContext, mqttexampleRECEIVE_LOOP_TIMEOUT_MS );
+ configASSERT( xMQTTStatus == MQTTSuccess );
+
+ /**************************** Disconnect. *****************************/
+
+ /* Send an MQTT Disconnect packet over the already connected TCP socket.
+ * There is no corresponding response for the disconnect packet. After
+ * sending disconnect, client must close the network connection. */
+ LogInfo( ( "Disconnecting the MQTT connection with %s.\r\n",
+ democonfigMQTT_BROKER_ENDPOINT ) );
+ xMQTTStatus = MQTT_Disconnect( &xMQTTContext );
+ configASSERT( xMQTTStatus == MQTTSuccess );
+
+ /* Stop the keep-alive timer for the next iteration. */
+ xTimerStatus = xTimerStop( xKeepAliveTimer, 0 );
+ configASSERT( xTimerStatus == pdPASS );
+
+ /* Close the network connection. */
+ xNetworkStatus = Plaintext_FreeRTOS_Disconnect( &xNetworkContext );
+ configASSERT( xNetworkStatus == PLAINTEXT_TRANSPORT_SUCCESS );
+
+ /* Reset SUBACK status for each topic filter after completion of subscription
+ * request cycle. */
+ for( ulTopicCount = 0; ulTopicCount < mqttexampleTOPIC_COUNT; ulTopicCount++ )
+ {
+ xTopicFilterContext[ ulTopicCount ].xSubAckStatus = MQTTSubAckFailure;
+ }
+
+ /* Wait for some time between two iterations to ensure that we do not
+ * bombard the broker. */
+ LogInfo( ( "prvMQTTDemoTask() completed an iteration successfully. "
+ "Total free heap is %u.\r\n",
+ xPortGetFreeHeapSize() ) );
+ LogInfo( ( "Demo completed successfully.\r\n" ) );
+ LogInfo( ( "Short delay before starting the next iteration.... \r\n\r\n" ) );
+ vTaskDelay( mqttexampleDELAY_BETWEEN_DEMO_ITERATIONS );
+ }
+}
+/*-----------------------------------------------------------*/
+
+static PlaintextTransportStatus_t prvConnectToServerWithBackoffRetries( NetworkContext_t * pxNetworkContext )
+{
+ PlaintextTransportStatus_t xNetworkStatus;
+ RetryUtilsStatus_t xRetryUtilsStatus = RetryUtilsSuccess;
+ RetryUtilsParams_t xReconnectParams;
+
+ /* Initialize reconnect attempts and interval. */
+ RetryUtils_ParamsReset( &xReconnectParams );
+ xReconnectParams.maxRetryAttempts = MAX_RETRY_ATTEMPTS;
+
+ /* Attempt to connect to MQTT broker. If connection fails, retry after
+ * a timeout. Timeout value will exponentially increase till maximum
+ * attempts are reached.
+ */
+ do
+ {
+ /* Establish a TCP connection with the MQTT broker. This example connects to
+ * the MQTT broker as specified in democonfigMQTT_BROKER_ENDPOINT and
+ * democonfigMQTT_BROKER_PORT at the top of this file. */
+ LogInfo( ( "Create a TCP connection to %s:%d.",
+ democonfigMQTT_BROKER_ENDPOINT,
+ democonfigMQTT_BROKER_PORT ) );
+ xNetworkStatus = Plaintext_FreeRTOS_Connect( pxNetworkContext,
+ democonfigMQTT_BROKER_ENDPOINT,
+ democonfigMQTT_BROKER_PORT,
+ mqttexampleTRANSPORT_SEND_RECV_TIMEOUT_MS,
+ mqttexampleTRANSPORT_SEND_RECV_TIMEOUT_MS );
+
+ if( xNetworkStatus != PLAINTEXT_TRANSPORT_SUCCESS )
+ {
+ LogWarn( ( "Connection to the broker failed. Retrying connection with backoff and jitter." ) );
+ xRetryUtilsStatus = RetryUtils_BackoffAndSleep( &xReconnectParams );
+ }
+
+ if( xRetryUtilsStatus == RetryUtilsRetriesExhausted )
+ {
+ LogError( ( "Connection to the broker failed, all attempts exhausted." ) );
+ xNetworkStatus = PLAINTEXT_TRANSPORT_CONNECT_FAILURE;
+ }
+ } while( ( xNetworkStatus != PLAINTEXT_TRANSPORT_SUCCESS ) && ( xRetryUtilsStatus == RetryUtilsSuccess ) );
+
+ return xNetworkStatus;
+}
+/*-----------------------------------------------------------*/
+
+static void prvCreateMQTTConnectionWithBroker( MQTTContext_t * pxMQTTContext,
+ NetworkContext_t * pxNetworkContext )
+{
+ MQTTStatus_t xResult;
+ MQTTConnectInfo_t xConnectInfo;
+ bool xSessionPresent;
+ TransportInterface_t xTransport;
+
+ /***
+ * For readability, error handling in this function is restricted to the use of
+ * asserts().
+ ***/
+
+ /* Fill in Transport Interface send and receive function pointers. */
+ xTransport.pNetworkContext = pxNetworkContext;
+ xTransport.send = Plaintext_FreeRTOS_send;
+ xTransport.recv = Plaintext_FreeRTOS_recv;
+
+ /* Initialize MQTT library. */
+ xResult = MQTT_Init( pxMQTTContext, &xTransport, prvGetTimeMs, prvEventCallback, &xBuffer );
+ configASSERT( xResult == MQTTSuccess );
+
+ /* Many fields not used in this demo so start with everything at 0. */
+ ( void ) memset( ( void * ) &xConnectInfo, 0x00, sizeof( xConnectInfo ) );
+
+ /* Start with a clean session i.e. direct the MQTT broker to discard any
+ * previous session data. Also, establishing a connection with clean session
+ * will ensure that the broker does not store any data when this client
+ * gets disconnected. */
+ xConnectInfo.cleanSession = true;
+
+ /* The client identifier is used to uniquely identify this MQTT client to
+ * the MQTT broker. In a production device the identifier can be something
+ * unique, such as a device serial number. */
+ xConnectInfo.pClientIdentifier = democonfigCLIENT_IDENTIFIER;
+ xConnectInfo.clientIdentifierLength = ( uint16_t ) strlen( democonfigCLIENT_IDENTIFIER );
+
+ /* Set MQTT keep-alive period. It is the responsibility of the application to ensure
+ * that the interval between Control Packets being sent does not exceed the Keep Alive value.
+ * In the absence of sending any other Control Packets, the Client MUST send a PINGREQ Packet. */
+ xConnectInfo.keepAliveSeconds = mqttexampleKEEP_ALIVE_TIMEOUT_SECONDS;
+
+ /* Send MQTT CONNECT packet to broker. LWT is not used in this demo, so it
+ * is passed as NULL. */
+ xResult = MQTT_Connect( pxMQTTContext,
+ &xConnectInfo,
+ NULL,
+ mqttexampleCONNACK_RECV_TIMEOUT_MS,
+ &xSessionPresent );
+ configASSERT( xResult == MQTTSuccess );
+}
+/*-----------------------------------------------------------*/
+
+static void prvUpdateSubAckStatus( MQTTPacketInfo_t * pxPacketInfo )
+{
+ MQTTStatus_t xResult = MQTTSuccess;
+ uint8_t * pucPayload = NULL;
+ size_t ulSize = 0;
+ uint32_t ulTopicCount = 0U;
+
+ xResult = MQTT_GetSubAckStatusCodes( pxPacketInfo, &pucPayload, &ulSize );
+
+ /* MQTT_GetSubAckStatusCodes always returns success if called with packet info
+ * from the event callback and non-NULL parameters. */
+ configASSERT( xResult == MQTTSuccess );
+
+ for( ulTopicCount = 0; ulTopicCount < ulSize; ulTopicCount++ )
+ {
+ xTopicFilterContext[ ulTopicCount ].xSubAckStatus = pucPayload[ ulTopicCount ];
+ }
+}
+/*-----------------------------------------------------------*/
+
+static void prvMQTTSubscribeWithBackoffRetries( MQTTContext_t * pxMQTTContext )
+{
+ MQTTStatus_t xResult = MQTTSuccess;
+ RetryUtilsStatus_t xRetryUtilsStatus = RetryUtilsSuccess;
+ RetryUtilsParams_t xRetryParams;
+ MQTTSubscribeInfo_t xMQTTSubscription[ mqttexampleTOPIC_COUNT ];
+ bool xFailedSubscribeToTopic = false;
+ uint32_t ulTopicCount = 0U;
+
+ /* Some fields not used by this demo so start with everything at 0. */
+ ( void ) memset( ( void * ) &xMQTTSubscription, 0x00, sizeof( xMQTTSubscription ) );
+
+ /* Get a unique packet id. */
+ usSubscribePacketIdentifier = MQTT_GetPacketId( pxMQTTContext );
+
+ /* Subscribe to the mqttexampleTOPIC topic filter. This example subscribes to
+ * only one topic and uses QoS0. */
+ xMQTTSubscription[ 0 ].qos = MQTTQoS0;
+ xMQTTSubscription[ 0 ].pTopicFilter = mqttexampleTOPIC;
+ xMQTTSubscription[ 0 ].topicFilterLength = ( uint16_t ) strlen( mqttexampleTOPIC );
+
+ /* Initialize retry attempts and interval. */
+ RetryUtils_ParamsReset( &xRetryParams );
+ xRetryParams.maxRetryAttempts = MAX_RETRY_ATTEMPTS;
+
+ do
+ {
+ /* The client is now connected to the broker. Subscribe to the topic
+ * as specified in mqttexampleTOPIC at the top of this file by sending a
+ * subscribe packet then waiting for a subscribe acknowledgment (SUBACK).
+ * This client will then publish to the same topic it subscribed to, so it
+ * will expect all the messages it sends to the broker to be sent back to it
+ * from the broker. This demo uses QOS0 in Subscribe, therefore, the Publish
+ * messages received from the broker will have QOS0. */
+ LogInfo( ( "Attempt to subscribe to the MQTT topic %s.\r\n", mqttexampleTOPIC ) );
+ xResult = MQTT_Subscribe( pxMQTTContext,
+ xMQTTSubscription,
+ sizeof( xMQTTSubscription ) / sizeof( MQTTSubscribeInfo_t ),
+ usSubscribePacketIdentifier );
+ configASSERT( xResult == MQTTSuccess );
+
+ LogInfo( ( "SUBSCRIBE sent for topic %s to broker.\n\n", mqttexampleTOPIC ) );
+
+ /* Process incoming packet from the broker. After sending the subscribe, the
+ * client may receive a publish before it receives a subscribe ack. Therefore,
+ * call generic incoming packet processing function. Since this demo is
+ * subscribing to the topic to which no one is publishing, probability of
+ * receiving Publish message before subscribe ack is zero; but application
+ * must be ready to receive any packet. This demo uses the generic packet
+ * processing function everywhere to highlight this fact. */
+ xResult = MQTT_ProcessLoop( pxMQTTContext, mqttexampleRECEIVE_LOOP_TIMEOUT_MS );
+ configASSERT( xResult == MQTTSuccess );
+
+ /* Check if recent subscription request has been rejected. #xTopicFilterContext is updated
+ * in the event callback to reflect the status of the SUBACK sent by the broker. It represents
+ * either the QoS level granted by the server upon subscription, or acknowledgement of
+ * server rejection of the subscription request. */
+ for( ulTopicCount = 0; ulTopicCount < mqttexampleTOPIC_COUNT; ulTopicCount++ )
+ {
+ if( xTopicFilterContext[ ulTopicCount ].xSubAckStatus == MQTTSubAckFailure )
+ {
+ LogWarn( ( "Server rejected subscription request. Attempting to re-subscribe to topic %s.",
+ xTopicFilterContext[ ulTopicCount ].pcTopicFilter ) );
+ xFailedSubscribeToTopic = true;
+ xRetryUtilsStatus = RetryUtils_BackoffAndSleep( &xRetryParams );
+ break;
+ }
+ }
+
+ configASSERT( xRetryUtilsStatus != RetryUtilsRetriesExhausted );
+ } while( ( xFailedSubscribeToTopic == true ) && ( xRetryUtilsStatus == RetryUtilsSuccess ) );
+}
+/*-----------------------------------------------------------*/
+
+static void prvMQTTPublishToTopic( MQTTContext_t * pxMQTTContext )
+{
+ MQTTStatus_t xResult;
+ MQTTPublishInfo_t xMQTTPublishInfo;
+ BaseType_t xTimerStatus;
+
+ /***
+ * For readability, error handling in this function is restricted to the use of
+ * asserts().
+ ***/
+
+ /* Some fields not used by this demo so start with everything at 0. */
+ ( void ) memset( ( void * ) &xMQTTPublishInfo, 0x00, sizeof( xMQTTPublishInfo ) );
+
+ /* This demo uses QoS0. */
+ xMQTTPublishInfo.qos = MQTTQoS0;
+ xMQTTPublishInfo.retain = false;
+ xMQTTPublishInfo.pTopicName = mqttexampleTOPIC;
+ xMQTTPublishInfo.topicNameLength = ( uint16_t ) strlen( mqttexampleTOPIC );
+ xMQTTPublishInfo.pPayload = mqttexampleMESSAGE;
+ xMQTTPublishInfo.payloadLength = strlen( mqttexampleMESSAGE );
+
+ /* Send PUBLISH packet. Packet ID is not used for a QoS0 publish. */
+ xResult = MQTT_Publish( pxMQTTContext, &xMQTTPublishInfo, 0U );
+ configASSERT( xResult == MQTTSuccess );
+
+ /* When a PUBLISH packet has been sent, the keep-alive timer can be reset. */
+ xTimerStatus = prvCheckTimeoutThenResetTimer( xKeepAliveTimer );
+ configASSERT( xTimerStatus == pdPASS );
+}
+/*-----------------------------------------------------------*/
+
+static void prvMQTTUnsubscribeFromTopic( MQTTContext_t * pxMQTTContext )
+{
+ MQTTStatus_t xResult;
+ MQTTSubscribeInfo_t xMQTTSubscription[ mqttexampleTOPIC_COUNT ];
+
+ /* Some fields not used by this demo so start with everything at 0. */
+ ( void ) memset( ( void * ) &xMQTTSubscription, 0x00, sizeof( xMQTTSubscription ) );
+
+ /* Get a unique packet id. */
+ usSubscribePacketIdentifier = MQTT_GetPacketId( pxMQTTContext );
+
+ /* Subscribe to the mqttexampleTOPIC topic filter. This example subscribes to
+ * only one topic and uses QoS0. */
+ xMQTTSubscription[ 0 ].qos = MQTTQoS0;
+ xMQTTSubscription[ 0 ].pTopicFilter = mqttexampleTOPIC;
+ xMQTTSubscription[ 0 ].topicFilterLength = ( uint16_t ) strlen( mqttexampleTOPIC );
+
+ /* Get next unique packet identifier. */
+ usUnsubscribePacketIdentifier = MQTT_GetPacketId( pxMQTTContext );
+
+ /* Send UNSUBSCRIBE packet. */
+ xResult = MQTT_Unsubscribe( pxMQTTContext,
+ xMQTTSubscription,
+ sizeof( xMQTTSubscription ) / sizeof( MQTTSubscribeInfo_t ),
+ usUnsubscribePacketIdentifier );
+
+ configASSERT( xResult == MQTTSuccess );
+}
+/*-----------------------------------------------------------*/
+
+static void prvMQTTProcessResponse( MQTTPacketInfo_t * pxIncomingPacket,
+ uint16_t usPacketId )
+{
+ uint32_t ulTopicCount = 0U;
+
+ switch( pxIncomingPacket->type )
+ {
+ case MQTT_PACKET_TYPE_SUBACK:
+
+ /* A SUBACK from the broker, containing the server response to our subscription request, has been received.
+ * It contains the status code indicating server approval/rejection for the subscription to the single topic
+ * requested. The SUBACK will be parsed to obtain the status code, and this status code will be stored in global
+ * variable #xTopicFilterContext. */
+ prvUpdateSubAckStatus( pxIncomingPacket );
+
+ for( ulTopicCount = 0; ulTopicCount < mqttexampleTOPIC_COUNT; ulTopicCount++ )
+ {
+ if( xTopicFilterContext[ ulTopicCount ].xSubAckStatus != MQTTSubAckFailure )
+ {
+ LogInfo( ( "Subscribed to the topic %s with maximum QoS %u.\r\n",
+ xTopicFilterContext[ ulTopicCount ].pcTopicFilter,
+ xTopicFilterContext[ ulTopicCount ].xSubAckStatus ) );
+ }
+ }
+
+ /* Make sure ACK packet identifier matches with Request packet identifier. */
+ configASSERT( usSubscribePacketIdentifier == usPacketId );
+ break;
+
+ case MQTT_PACKET_TYPE_UNSUBACK:
+ LogInfo( ( "Unsubscribed from the topic %s.\r\n", mqttexampleTOPIC ) );
+ /* Make sure ACK packet identifier matches with Request packet identifier. */
+ configASSERT( usUnsubscribePacketIdentifier == usPacketId );
+ break;
+
+ case MQTT_PACKET_TYPE_PINGRESP:
+ xWaitingForPingResp = false;
+ LogInfo( ( "Ping Response successfully received.\r\n" ) );
+ break;
+
+ /* Any other packet type is invalid. */
+ default:
+ LogWarn( ( "prvMQTTProcessResponse() called with unknown packet type:(%02X).\r\n",
+ pxIncomingPacket->type ) );
+ }
+}
+
+/*-----------------------------------------------------------*/
+
+static void prvMQTTProcessIncomingPublish( MQTTPublishInfo_t * pxPublishInfo )
+{
+ configASSERT( pxPublishInfo != NULL );
+
+ /* Process incoming Publish. */
+ LogInfo( ( "Incoming QoS : %d\n", pxPublishInfo->qos ) );
+
+ /* Verify the received publish is for the we have subscribed to. */
+ if( ( pxPublishInfo->topicNameLength == strlen( mqttexampleTOPIC ) ) &&
+ ( 0 == strncmp( mqttexampleTOPIC, pxPublishInfo->pTopicName, pxPublishInfo->topicNameLength ) ) )
+ {
+ LogInfo( ( "\r\nIncoming Publish Topic Name: %.*s matches subscribed topic.\r\n"
+ "Incoming Publish Message : %.*s\r\n",
+ pxPublishInfo->topicNameLength,
+ pxPublishInfo->pTopicName,
+ pxPublishInfo->payloadLength,
+ pxPublishInfo->pPayload ) );
+ }
+ else
+ {
+ LogInfo( ( "Incoming Publish Topic Name: %.*s does not match subscribed topic.\r\n",
+ pxPublishInfo->topicNameLength,
+ pxPublishInfo->pTopicName ) );
+ }
+}
+
+/*-----------------------------------------------------------*/
+
+static BaseType_t prvCheckTimeoutThenResetTimer( TimerHandle_t pxTimer )
+{
+ uint32_t now = 0U;
+
+ if( xWaitingForPingResp == true )
+ {
+ now = prvGetTimeMs();
+ /* Assert that the PINGRESP timeout has not expired. */
+ configASSERT( ( now - ulPingReqSendTimeMs ) <= ulPingRespTimeoutMs );
+ }
+
+ return xTimerReset( pxTimer, 0 );
+}
+
+/*-----------------------------------------------------------*/
+
+static void prvKeepAliveTimerCallback( TimerHandle_t pxTimer )
+{
+ TransportInterface_t * pxTransport;
+ int32_t xTransportStatus;
+ uint32_t now = 0U;
+
+ pxTransport = ( TransportInterface_t * ) pvTimerGetTimerID( pxTimer );
+
+ if( xWaitingForPingResp == true )
+ {
+ now = prvGetTimeMs();
+ /* Assert that the PINGRESP timeout has not expired. */
+ configASSERT( ( now - ulPingReqSendTimeMs ) <= ulPingRespTimeoutMs );
+ }
+ else
+ {
+ /* Send Ping Request to the broker. */
+ LogInfo( ( "Attempt to ping the MQTT broker.\r\n" ) );
+ xTransportStatus = pxTransport->send( pxTransport->pNetworkContext,
+ ( void * ) xPingReqBuffer.pBuffer,
+ xPingReqBuffer.size );
+ configASSERT( ( size_t ) xTransportStatus == xPingReqBuffer.size );
+
+ ulPingReqSendTimeMs = prvGetTimeMs();
+ xWaitingForPingResp = true;
+ }
+}
+
+/*-----------------------------------------------------------*/
+
+static void prvEventCallback( MQTTContext_t * pxMQTTContext,
+ MQTTPacketInfo_t * pxPacketInfo,
+ MQTTDeserializedInfo_t * pxDeserializedInfo )
+{
+ /* The MQTT context is not used for this demo. */
+ ( void ) pxMQTTContext;
+
+ if( ( pxPacketInfo->type & 0xF0U ) == MQTT_PACKET_TYPE_PUBLISH )
+ {
+ prvMQTTProcessIncomingPublish( pxDeserializedInfo->pPublishInfo );
+ }
+ else
+ {
+ prvMQTTProcessResponse( pxPacketInfo, pxDeserializedInfo->packetIdentifier );
+ }
+}
+
+/*-----------------------------------------------------------*/
+
+static uint32_t prvGetTimeMs( void )
+{
+ TickType_t xTickCount = 0;
+ uint32_t ulTimeMs = 0UL;
+
+ /* Get the current tick count. */
+ xTickCount = xTaskGetTickCount();
+
+ /* Convert the ticks to milliseconds. */
+ ulTimeMs = ( uint32_t ) xTickCount * _MILLISECONDS_PER_TICK;
+
+ /* Reduce ulGlobalEntryTimeMs from obtained time so as to always return the
+ * elapsed time in the application. */
+ ulTimeMs = ( uint32_t ) ( ulTimeMs - ulGlobalEntryTimeMs );
+
+ return ulTimeMs;
+}
+
+/*-----------------------------------------------------------*/
diff --git a/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/FreeRTOSConfig.h b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/FreeRTOSConfig.h
new file mode 100644
index 0000000000..06a0b50e27
--- /dev/null
+++ b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/FreeRTOSConfig.h
@@ -0,0 +1,216 @@
+/*
+ * FreeRTOS Kernel V10.3.0
+ * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+ */
+
+#ifndef FREERTOS_CONFIG_H
+#define FREERTOS_CONFIG_H
+
+/*-----------------------------------------------------------
+* Application specific definitions.
+*
+* These definitions should be adjusted for your particular hardware and
+* application requirements.
+*
+* THESE PARAMETERS ARE DESCRIBED WITHIN THE 'CONFIGURATION' SECTION OF THE
+* FreeRTOS API DOCUMENTATION AVAILABLE ON THE FreeRTOS.org WEB SITE.
+* http://www.freertos.org/a00110.html
+*
+* The bottom of this file contains some constants specific to running the UDP
+* stack in this demo. Constants specific to FreeRTOS+TCP itself (rather than
+* the demo) are contained in FreeRTOSIPConfig.h.
+*----------------------------------------------------------*/
+#define configUSE_PREEMPTION 1
+#define configUSE_PORT_OPTIMISED_TASK_SELECTION 1
+#define configMAX_PRIORITIES ( 7 )
+#define configTICK_RATE_HZ ( 1000 ) /* In this non-real time simulated environment the tick frequency has to be at least a multiple of the Win32 tick frequency, and therefore very slow. */
+#define configMINIMAL_STACK_SIZE ( ( unsigned short ) 60 ) /* In this simulated case, the stack only has to hold one small structure as the real stack is part of the Win32 thread. */
+#define configTOTAL_HEAP_SIZE ( ( size_t ) ( 2048U * 1024U ) )
+#define configMAX_TASK_NAME_LEN ( 15 )
+#define configUSE_TRACE_FACILITY 0
+#define configUSE_16_BIT_TICKS 0
+#define configIDLE_SHOULD_YIELD 1
+#define configUSE_CO_ROUTINES 0
+#define configUSE_MUTEXES 1
+#define configUSE_RECURSIVE_MUTEXES 1
+#define configQUEUE_REGISTRY_SIZE 0
+#define configUSE_APPLICATION_TASK_TAG 0
+#define configUSE_COUNTING_SEMAPHORES 1
+#define configUSE_ALTERNATIVE_API 0
+#define configNUM_THREAD_LOCAL_STORAGE_POINTERS 0
+#define configENABLE_BACKWARD_COMPATIBILITY 1
+#define configSUPPORT_STATIC_ALLOCATION 1
+
+/* Hook function related definitions. */
+#define configUSE_TICK_HOOK 0
+#define configUSE_IDLE_HOOK 0
+#define configUSE_MALLOC_FAILED_HOOK 0
+#define configCHECK_FOR_STACK_OVERFLOW 0 /* Not applicable to the Win32 port. */
+
+/* Software timer related definitions. */
+#define configUSE_TIMERS 1
+#define configTIMER_TASK_PRIORITY ( configMAX_PRIORITIES - 1 )
+#define configTIMER_QUEUE_LENGTH 5
+#define configTIMER_TASK_STACK_DEPTH ( configMINIMAL_STACK_SIZE * 2 )
+
+/* Event group related definitions. */
+#define configUSE_EVENT_GROUPS 1
+
+/* Run time stats gathering configuration options. */
+#define configGENERATE_RUN_TIME_STATS 0
+
+/* Co-routine definitions. */
+#define configUSE_CO_ROUTINES 0
+#define configMAX_CO_ROUTINE_PRIORITIES ( 2 )
+
+/* Set the following definitions to 1 to include the API function, or zero
+ * to exclude the API function. */
+#define INCLUDE_vTaskPrioritySet 1
+#define INCLUDE_uxTaskPriorityGet 1
+#define INCLUDE_vTaskDelete 1
+#define INCLUDE_vTaskCleanUpResources 0
+#define INCLUDE_vTaskSuspend 1
+#define INCLUDE_vTaskDelayUntil 1
+#define INCLUDE_vTaskDelay 1
+#define INCLUDE_uxTaskGetStackHighWaterMark 1
+#define INCLUDE_xTaskGetSchedulerState 1
+#define INCLUDE_xTimerGetTimerTaskHandle 0
+#define INCLUDE_xTaskGetIdleTaskHandle 0
+#define INCLUDE_xQueueGetMutexHolder 1
+#define INCLUDE_eTaskGetState 1
+#define INCLUDE_xEventGroupSetBitsFromISR 1
+#define INCLUDE_xTimerPendFunctionCall 1
+#define INCLUDE_pcTaskGetTaskName 1
+
+/* This demo makes use of one or more example stats formatting functions. These
+ * format the raw data provided by the uxTaskGetSystemState() function in to human
+ * readable ASCII form. See the notes in the implementation of vTaskList() within
+ * FreeRTOS/Source/tasks.c for limitations. configUSE_STATS_FORMATTING_FUNCTIONS
+ * is set to 2 so the formatting functions are included without the stdio.h being
+ * included in tasks.c. That is because this project defines its own sprintf()
+ * functions. */
+#define configUSE_STATS_FORMATTING_FUNCTIONS 1
+
+/* Assert call defined for debug builds. */
+#ifdef _DEBUG
+ extern void vAssertCalled( const char * pcFile,
+ uint32_t ulLine );
+ #define configASSERT( x ) if( ( x ) == 0 ) vAssertCalled( __FILE__, __LINE__ )
+#endif /* _DEBUG */
+
+
+
+/* Application specific definitions follow. **********************************/
+
+/* Only used when running in the FreeRTOS Windows simulator. Defines the
+ * priority of the task used to simulate Ethernet interrupts. */
+#define configMAC_ISR_SIMULATOR_PRIORITY ( configMAX_PRIORITIES - 1 )
+
+/* This demo creates a virtual network connection by accessing the raw Ethernet
+ * or WiFi data to and from a real network connection. Many computers have more
+ * than one real network port, and configNETWORK_INTERFACE_TO_USE is used to tell
+ * the demo which real port should be used to create the virtual port. The ports
+ * available are displayed on the console when the application is executed. For
+ * example, on my development laptop setting configNETWORK_INTERFACE_TO_USE to 4
+ * results in the wired network being used, while setting
+ * configNETWORK_INTERFACE_TO_USE to 2 results in the wireless network being
+ * used. */
+#define configNETWORK_INTERFACE_TO_USE 1L
+
+/* The address to which logging is sent should UDP logging be enabled. */
+#define configUDP_LOGGING_ADDR0 192
+#define configUDP_LOGGING_ADDR1 168
+#define configUDP_LOGGING_ADDR2 0
+#define configUDP_LOGGING_ADDR3 11
+
+/* Default MAC address configuration. The demo creates a virtual network
+ * connection that uses this MAC address by accessing the raw Ethernet/WiFi data
+ * to and from a real network connection on the host PC. See the
+ * configNETWORK_INTERFACE_TO_USE definition above for information on how to
+ * configure the real network connection to use. */
+#define configMAC_ADDR0 0x00
+#define configMAC_ADDR1 0x11
+#define configMAC_ADDR2 0x11
+#define configMAC_ADDR3 0x11
+#define configMAC_ADDR4 0x11
+#define configMAC_ADDR5 0x41
+
+/* Default IP address configuration. Used in ipconfigUSE_DNS is set to 0, or
+ * ipconfigUSE_DNS is set to 1 but a DNS server cannot be contacted. */
+#define configIP_ADDR0 10
+#define configIP_ADDR1 10
+#define configIP_ADDR2 10
+#define configIP_ADDR3 200
+
+/* Default gateway IP address configuration. Used in ipconfigUSE_DNS is set to
+ * 0, or ipconfigUSE_DNS is set to 1 but a DNS server cannot be contacted. */
+#define configGATEWAY_ADDR0 10
+#define configGATEWAY_ADDR1 10
+#define configGATEWAY_ADDR2 10
+#define configGATEWAY_ADDR3 1
+
+/* Default DNS server configuration. OpenDNS addresses are 208.67.222.222 and
+ * 208.67.220.220. Used in ipconfigUSE_DNS is set to 0, or ipconfigUSE_DNS is set
+ * to 1 but a DNS server cannot be contacted.*/
+#define configDNS_SERVER_ADDR0 208
+#define configDNS_SERVER_ADDR1 67
+#define configDNS_SERVER_ADDR2 222
+#define configDNS_SERVER_ADDR3 222
+
+/* Default netmask configuration. Used in ipconfigUSE_DNS is set to 0, or
+ * ipconfigUSE_DNS is set to 1 but a DNS server cannot be contacted. */
+#define configNET_MASK0 255
+#define configNET_MASK1 0
+#define configNET_MASK2 0
+#define configNET_MASK3 0
+
+/* The UDP port to which print messages are sent. */
+#define configPRINT_PORT ( 15000 )
+
+/* Task pool definitions for the demos of IoT Libraries. */
+#define configTASKPOOL_ENABLE_ASSERTS 1
+#define configTASKPOOL_NUMBER_OF_WORKERS 1
+#define configTASKPOOL_WORKER_PRIORITY tskIDLE_PRIORITY
+#define configTASKPOOL_WORKER_STACK_SIZE_BYTES 2048
+
+#if ( defined( _MSC_VER ) && ( _MSC_VER <= 1600 ) && !defined( snprintf ) )
+ /* Map to Windows names. */
+ #define snprintf _snprintf
+ #define vsnprintf _vsnprintf
+#endif
+
+/* Visual studio does not have an implementation of strcasecmp(). */
+#define strcasecmp _stricmp
+#define strncasecmp _strnicmp
+#define strcmpi _strcmpi
+
+/* Prototype for the function used to print out. In this case it prints to the
+ * console before the network is connected then a UDP port after the network has
+ * connected. */
+extern void vLoggingPrintf( const char * pcFormatString,
+ ... );
+#define configPRINTF( X ) vLoggingPrintf X
+
+#endif /* FREERTOS_CONFIG_H */
diff --git a/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/FreeRTOSIPConfig.h b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/FreeRTOSIPConfig.h
new file mode 100644
index 0000000000..0c090966e3
--- /dev/null
+++ b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/FreeRTOSIPConfig.h
@@ -0,0 +1,311 @@
+/*
+ * FreeRTOS Kernel V10.3.0
+ * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+ */
+
+
+/*****************************************************************************
+*
+* See the following URL for configuration information.
+* http://www.freertos.org/FreeRTOS-Plus/FreeRTOS_Plus_TCP/TCP_IP_Configuration.html
+*
+*****************************************************************************/
+
+#ifndef FREERTOS_IP_CONFIG_H
+#define FREERTOS_IP_CONFIG_H
+
+/* Prototype for the function used to print out. In this case it prints to the
+ * console before the network is connected then a UDP port after the network has
+ * connected. */
+extern void vLoggingPrintf( const char * pcFormatString,
+ ... );
+
+/* Set to 1 to print out debug messages. If ipconfigHAS_DEBUG_PRINTF is set to
+ * 1 then FreeRTOS_debug_printf should be defined to the function used to print
+ * out the debugging messages. */
+#define ipconfigHAS_DEBUG_PRINTF 0
+#if ( ipconfigHAS_DEBUG_PRINTF == 1 )
+ #define FreeRTOS_debug_printf( X ) vLoggingPrintf X
+#endif
+
+/* Set to 1 to print out non debugging messages, for example the output of the
+ * FreeRTOS_netstat() command, and ping replies. If ipconfigHAS_PRINTF is set to 1
+ * then FreeRTOS_printf should be set to the function used to print out the
+ * messages. */
+#define ipconfigHAS_PRINTF 1
+#if ( ipconfigHAS_PRINTF == 1 )
+ #define FreeRTOS_printf( X ) vLoggingPrintf X
+#endif
+
+/* Define the byte order of the target MCU (the MCU FreeRTOS+TCP is executing
+ * on). Valid options are pdFREERTOS_BIG_ENDIAN and pdFREERTOS_LITTLE_ENDIAN. */
+#define ipconfigBYTE_ORDER pdFREERTOS_LITTLE_ENDIAN
+
+/* If the network card/driver includes checksum offloading (IP/TCP/UDP checksums)
+ * then set ipconfigDRIVER_INCLUDED_RX_IP_CHECKSUM to 1 to prevent the software
+ * stack repeating the checksum calculations. */
+#define ipconfigDRIVER_INCLUDED_RX_IP_CHECKSUM 1
+
+/* Several API's will block until the result is known, or the action has been
+ * performed, for example FreeRTOS_send() and FreeRTOS_recv(). The timeouts can be
+ * set per socket, using setsockopt(). If not set, the times below will be
+ * used as defaults. */
+#define ipconfigSOCK_DEFAULT_RECEIVE_BLOCK_TIME ( 2000 )
+#define ipconfigSOCK_DEFAULT_SEND_BLOCK_TIME ( 5000 )
+
+/* Include support for LLMNR: Link-local Multicast Name Resolution
+ * (non-Microsoft) */
+#define ipconfigUSE_LLMNR ( 0 )
+
+/* Include support for NBNS: NetBIOS Name Service (Microsoft) */
+#define ipconfigUSE_NBNS ( 0 )
+
+/* Include support for DNS caching. For TCP, having a small DNS cache is very
+ * useful. When a cache is present, ipconfigDNS_REQUEST_ATTEMPTS can be kept low
+ * and also DNS may use small timeouts. If a DNS reply comes in after the DNS
+ * socket has been destroyed, the result will be stored into the cache. The next
+ * call to FreeRTOS_gethostbyname() will return immediately, without even creating
+ * a socket. */
+#define ipconfigUSE_DNS_CACHE ( 1 )
+#define ipconfigDNS_CACHE_NAME_LENGTH ( 32 )
+#define ipconfigDNS_CACHE_ENTRIES ( 4 )
+#define ipconfigDNS_REQUEST_ATTEMPTS ( 2 )
+
+/* The IP stack executes it its own task (although any application task can make
+ * use of its services through the published sockets API). ipconfigUDP_TASK_PRIORITY
+ * sets the priority of the task that executes the IP stack. The priority is a
+ * standard FreeRTOS task priority so can take any value from 0 (the lowest
+ * priority) to (configMAX_PRIORITIES - 1) (the highest priority).
+ * configMAX_PRIORITIES is a standard FreeRTOS configuration parameter defined in
+ * FreeRTOSConfig.h, not FreeRTOSIPConfig.h. Consideration needs to be given as to
+ * the priority assigned to the task executing the IP stack relative to the
+ * priority assigned to tasks that use the IP stack. */
+#define ipconfigIP_TASK_PRIORITY ( configMAX_PRIORITIES - 2 )
+
+/* The size, in words (not bytes), of the stack allocated to the FreeRTOS+TCP
+ * task. This setting is less important when the FreeRTOS Win32 simulator is used
+ * as the Win32 simulator only stores a fixed amount of information on the task
+ * stack. FreeRTOS includes optional stack overflow detection, see:
+ * http://www.freertos.org/Stacks-and-stack-overflow-checking.html */
+#define ipconfigIP_TASK_STACK_SIZE_WORDS ( configMINIMAL_STACK_SIZE * 5 )
+
+/* ipconfigRAND32() is called by the IP stack to generate random numbers for
+ * things such as a DHCP transaction number or initial sequence number. Random
+ * number generation is performed via this macro to allow applications to use their
+ * own random number generation method. For example, it might be possible to
+ * generate a random number by sampling noise on an analogue input. */
+extern UBaseType_t uxRand();
+#define ipconfigRAND32() uxRand()
+
+/* If ipconfigUSE_NETWORK_EVENT_HOOK is set to 1 then FreeRTOS+TCP will call the
+ * network event hook at the appropriate times. If ipconfigUSE_NETWORK_EVENT_HOOK
+ * is not set to 1 then the network event hook will never be called. See
+ * http://www.FreeRTOS.org/FreeRTOS-Plus/FreeRTOS_Plus_UDP/API/vApplicationIPNetworkEventHook.shtml
+ */
+#define ipconfigUSE_NETWORK_EVENT_HOOK 1
+
+/* Sockets have a send block time attribute. If FreeRTOS_sendto() is called but
+ * a network buffer cannot be obtained then the calling task is held in the Blocked
+ * state (so other tasks can continue to executed) until either a network buffer
+ * becomes available or the send block time expires. If the send block time expires
+ * then the send operation is aborted. The maximum allowable send block time is
+ * capped to the value set by ipconfigMAX_SEND_BLOCK_TIME_TICKS. Capping the
+ * maximum allowable send block time prevents prevents a deadlock occurring when
+ * all the network buffers are in use and the tasks that process (and subsequently
+ * free) the network buffers are themselves blocked waiting for a network buffer.
+ * ipconfigMAX_SEND_BLOCK_TIME_TICKS is specified in RTOS ticks. A time in
+ * milliseconds can be converted to a time in ticks by dividing the time in
+ * milliseconds by portTICK_PERIOD_MS. */
+#define ipconfigUDP_MAX_SEND_BLOCK_TIME_TICKS ( 5000 / portTICK_PERIOD_MS )
+
+/* If ipconfigUSE_DHCP is 1 then FreeRTOS+TCP will attempt to retrieve an IP
+ * address, netmask, DNS server address and gateway address from a DHCP server. If
+ * ipconfigUSE_DHCP is 0 then FreeRTOS+TCP will use a static IP address. The
+ * stack will revert to using the static IP address even when ipconfigUSE_DHCP is
+ * set to 1 if a valid configuration cannot be obtained from a DHCP server for any
+ * reason. The static configuration used is that passed into the stack by the
+ * FreeRTOS_IPInit() function call. */
+#define ipconfigUSE_DHCP 1
+
+/* When ipconfigUSE_DHCP is set to 1, DHCP requests will be sent out at
+ * increasing time intervals until either a reply is received from a DHCP server
+ * and accepted, or the interval between transmissions reaches
+ * ipconfigMAXIMUM_DISCOVER_TX_PERIOD. The IP stack will revert to using the
+ * static IP address passed as a parameter to FreeRTOS_IPInit() if the
+ * re-transmission time interval reaches ipconfigMAXIMUM_DISCOVER_TX_PERIOD without
+ * a DHCP reply being received. */
+#define ipconfigMAXIMUM_DISCOVER_TX_PERIOD ( 120000 / portTICK_PERIOD_MS )
+
+/* The ARP cache is a table that maps IP addresses to MAC addresses. The IP
+ * stack can only send a UDP message to a remove IP address if it knowns the MAC
+ * address associated with the IP address, or the MAC address of the router used to
+ * contact the remote IP address. When a UDP message is received from a remote IP
+ * address the MAC address and IP address are added to the ARP cache. When a UDP
+ * message is sent to a remote IP address that does not already appear in the ARP
+ * cache then the UDP message is replaced by a ARP message that solicits the
+ * required MAC address information. ipconfigARP_CACHE_ENTRIES defines the maximum
+ * number of entries that can exist in the ARP table at any one time. */
+#define ipconfigARP_CACHE_ENTRIES 6
+
+/* ARP requests that do not result in an ARP response will be re-transmitted a
+ * maximum of ipconfigMAX_ARP_RETRANSMISSIONS times before the ARP request is
+ * aborted. */
+#define ipconfigMAX_ARP_RETRANSMISSIONS ( 5 )
+
+/* ipconfigMAX_ARP_AGE defines the maximum time between an entry in the ARP
+ * table being created or refreshed and the entry being removed because it is stale.
+ * New ARP requests are sent for ARP cache entries that are nearing their maximum
+ * age. ipconfigMAX_ARP_AGE is specified in tens of seconds, so a value of 150 is
+ * equal to 1500 seconds (or 25 minutes). */
+#define ipconfigMAX_ARP_AGE 150
+
+/* Implementing FreeRTOS_inet_addr() necessitates the use of string handling
+ * routines, which are relatively large. To save code space the full
+ * FreeRTOS_inet_addr() implementation is made optional, and a smaller and faster
+ * alternative called FreeRTOS_inet_addr_quick() is provided. FreeRTOS_inet_addr()
+ * takes an IP in decimal dot format (for example, "192.168.0.1") as its parameter.
+ * FreeRTOS_inet_addr_quick() takes an IP address as four separate numerical octets
+ * (for example, 192, 168, 0, 1) as its parameters. If
+ * ipconfigINCLUDE_FULL_INET_ADDR is set to 1 then both FreeRTOS_inet_addr() and
+ * FreeRTOS_indet_addr_quick() are available. If ipconfigINCLUDE_FULL_INET_ADDR is
+ * not set to 1 then only FreeRTOS_indet_addr_quick() is available. */
+#define ipconfigINCLUDE_FULL_INET_ADDR 1
+
+/* ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS defines the total number of network buffer that
+ * are available to the IP stack. The total number of network buffers is limited
+ * to ensure the total amount of RAM that can be consumed by the IP stack is capped
+ * to a pre-determinable value. */
+#define ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS 60
+
+/* A FreeRTOS queue is used to send events from application tasks to the IP
+ * stack. ipconfigEVENT_QUEUE_LENGTH sets the maximum number of events that can
+ * be queued for processing at any one time. The event queue must be a minimum of
+ * 5 greater than the total number of network buffers. */
+#define ipconfigEVENT_QUEUE_LENGTH ( ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS + 5 )
+
+/* The address of a socket is the combination of its IP address and its port
+ * number. FreeRTOS_bind() is used to manually allocate a port number to a socket
+ * (to 'bind' the socket to a port), but manual binding is not normally necessary
+ * for client sockets (those sockets that initiate outgoing connections rather than
+ * wait for incoming connections on a known port number). If
+ * ipconfigALLOW_SOCKET_SEND_WITHOUT_BIND is set to 1 then calling
+ * FreeRTOS_sendto() on a socket that has not yet been bound will result in the IP
+ * stack automatically binding the socket to a port number from the range
+ * socketAUTO_PORT_ALLOCATION_START_NUMBER to 0xffff. If
+ * ipconfigALLOW_SOCKET_SEND_WITHOUT_BIND is set to 0 then calling FreeRTOS_sendto()
+ * on a socket that has not yet been bound will result in the send operation being
+ * aborted. */
+#define ipconfigALLOW_SOCKET_SEND_WITHOUT_BIND 1
+
+/* Defines the Time To Live (TTL) values used in outgoing UDP packets. */
+#define ipconfigUDP_TIME_TO_LIVE 128
+#define ipconfigTCP_TIME_TO_LIVE 128 /* also defined in FreeRTOSIPConfigDefaults.h */
+
+/* USE_TCP: Use TCP and all its features */
+#define ipconfigUSE_TCP ( 1 )
+
+/* Use the TCP socket wake context with a callback. */
+#define ipconfigSOCKET_HAS_USER_WAKE_CALLBACK_WITH_CONTEXT ( 1 )
+
+/* USE_WIN: Let TCP use windowing mechanism. */
+#define ipconfigUSE_TCP_WIN ( 1 )
+
+/* The MTU is the maximum number of bytes the payload of a network frame can
+ * contain. For normal Ethernet V2 frames the maximum MTU is 1500. Setting a
+ * lower value can save RAM, depending on the buffer management scheme used. If
+ * ipconfigCAN_FRAGMENT_OUTGOING_PACKETS is 1 then (ipconfigNETWORK_MTU - 28) must
+ * be divisible by 8. */
+#define ipconfigNETWORK_MTU 1200
+
+/* Set ipconfigUSE_DNS to 1 to include a basic DNS client/resolver. DNS is used
+ * through the FreeRTOS_gethostbyname() API function. */
+#define ipconfigUSE_DNS 1
+
+/* If ipconfigREPLY_TO_INCOMING_PINGS is set to 1 then the IP stack will
+ * generate replies to incoming ICMP echo (ping) requests. */
+#define ipconfigREPLY_TO_INCOMING_PINGS 1
+
+/* If ipconfigSUPPORT_OUTGOING_PINGS is set to 1 then the
+ * FreeRTOS_SendPingRequest() API function is available. */
+#define ipconfigSUPPORT_OUTGOING_PINGS 0
+
+/* If ipconfigSUPPORT_SELECT_FUNCTION is set to 1 then the FreeRTOS_select()
+ * (and associated) API function is available. */
+#define ipconfigSUPPORT_SELECT_FUNCTION 1
+
+/* If ipconfigFILTER_OUT_NON_ETHERNET_II_FRAMES is set to 1 then Ethernet frames
+ * that are not in Ethernet II format will be dropped. This option is included for
+ * potential future IP stack developments. */
+#define ipconfigFILTER_OUT_NON_ETHERNET_II_FRAMES 1
+
+/* If ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES is set to 1 then it is the
+ * responsibility of the Ethernet interface to filter out packets that are of no
+ * interest. If the Ethernet interface does not implement this functionality, then
+ * set ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES to 0 to have the IP stack
+ * perform the filtering instead (it is much less efficient for the stack to do it
+ * because the packet will already have been passed into the stack). If the
+ * Ethernet driver does all the necessary filtering in hardware then software
+ * filtering can be removed by using a value other than 1 or 0. */
+#define ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES 1
+
+/* The windows simulator cannot really simulate MAC interrupts, and needs to
+ * block occasionally to allow other tasks to run. */
+#define configWINDOWS_MAC_INTERRUPT_SIMULATOR_DELAY ( 20 / portTICK_PERIOD_MS )
+
+/* Advanced only: in order to access 32-bit fields in the IP packets with
+ * 32-bit memory instructions, all packets will be stored 32-bit-aligned, plus 16-bits.
+ * This has to do with the contents of the IP-packets: all 32-bit fields are
+ * 32-bit-aligned, plus 16-bit(!) */
+#define ipconfigPACKET_FILLER_SIZE 2
+
+/* Define the size of the pool of TCP window descriptors. On the average, each
+ * TCP socket will use up to 2 x 6 descriptors, meaning that it can have 2 x 6
+ * outstanding packets (for Rx and Tx). When using up to 10 TP sockets
+ * simultaneously, one could define TCP_WIN_SEG_COUNT as 120. */
+#define ipconfigTCP_WIN_SEG_COUNT 240
+
+/* Each TCP socket has a circular buffers for Rx and Tx, which have a fixed
+ * maximum size. Define the size of Rx buffer for TCP sockets. */
+#define ipconfigTCP_RX_BUFFER_LENGTH ( 1000 )
+
+/* Define the size of Tx buffer for TCP sockets. */
+#define ipconfigTCP_TX_BUFFER_LENGTH ( 1000 )
+
+/* When using call-back handlers, the driver may check if the handler points to
+ * real program memory (RAM or flash) or just has a random non-zero value. */
+#define ipconfigIS_VALID_PROG_ADDRESS( x ) ( ( x ) != NULL )
+
+/* Include support for TCP hang protection. All sockets in a connecting or
+ * disconnecting stage will timeout after a period of non-activity. */
+#define ipconfigTCP_HANG_PROTECTION ( 1 )
+#define ipconfigTCP_HANG_PROTECTION_TIME ( 30 )
+
+/* Include support for TCP keep-alive messages. */
+#define ipconfigTCP_KEEP_ALIVE ( 1 )
+#define ipconfigTCP_KEEP_ALIVE_INTERVAL ( 20 ) /* in seconds */
+
+#define portINLINE __inline
+
+#endif /* FREERTOS_IP_CONFIG_H */
diff --git a/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/READ_ME_INSTRUCTIONS.url b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/READ_ME_INSTRUCTIONS.url
new file mode 100644
index 0000000000..cddcf75a4d
--- /dev/null
+++ b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/READ_ME_INSTRUCTIONS.url
@@ -0,0 +1,5 @@
+[{000214A0-0000-0000-C000-000000000046}]
+Prop3=19,11
+[InternetShortcut]
+IDList=
+URL=https://www.freertos.org/mqtt_lts/
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new file mode 100644
index 0000000000..56c2145598
--- /dev/null
+++ b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/WIN32.vcxproj
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+ <ItemGroup>
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+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\include\FreeRTOS.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\include\portable.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\include\projdefs.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\include\queue.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\include\semphr.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\include\task.h" />
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+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\portable\MSVC-MingW\portmacro.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOSIPConfigDefaults.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_ARP.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_DHCP.h" />
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+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_IP.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_IP_Private.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_Sockets.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_Stream_Buffer.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_TCP_IP.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_TCP_WIN.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_UDP_IP.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\IPTraceMacroDefaults.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\NetworkBufferManagement.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\NetworkInterface.h" />
+ <ClInclude Include="..\..\..\Source\Application-Protocols\platform\freertos\transport\include\plaintext_freertos.h" />
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+ <ClInclude Include="..\..\..\Source\Application-Protocols\coreMQTT\source\include\core_mqtt_serializer.h" />
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+ <ClInclude Include="..\..\..\Source\Application-Protocols\coreMQTT\source\include\core_mqtt.h" />
+ <ClInclude Include="demo_config.h" />
+ <ClInclude Include="FreeRTOSConfig.h" />
+ <ClInclude Include="FreeRTOSIPConfig.h" />
+ <ClInclude Include="core_mqtt_config.h" />
+ </ItemGroup>
+ <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+ <ImportGroup Label="ExtensionTargets">
+ </ImportGroup>
+</Project>
\ No newline at end of file
diff --git a/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/WIN32.vcxproj.filters b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/WIN32.vcxproj.filters
new file mode 100644
index 0000000000..60d0f1b635
--- /dev/null
+++ b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/WIN32.vcxproj.filters
@@ -0,0 +1,223 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+ <ItemGroup>
+ <Filter Include="FreeRTOS">
+ <UniqueIdentifier>{af3445a1-4908-4170-89ed-39345d90d30c}</UniqueIdentifier>
+ </Filter>
+ <Filter Include="FreeRTOS\Source">
+ <UniqueIdentifier>{f32be356-4763-4cae-9020-974a2638cb08}</UniqueIdentifier>
+ <Extensions>*.c</Extensions>
+ </Filter>
+ <Filter Include="FreeRTOS\Source\Portable">
+ <UniqueIdentifier>{88f409e6-d396-4ac5-94bd-7a99c914be46}</UniqueIdentifier>
+ </Filter>
+ <Filter Include="FreeRTOS+">
+ <UniqueIdentifier>{e5ad4ec7-23dc-4295-8add-2acaee488f5a}</UniqueIdentifier>
+ </Filter>
+ <Filter Include="FreeRTOS\Source\include">
+ <UniqueIdentifier>{d2dcd641-8d91-492b-852f-5563ffadaec6}</UniqueIdentifier>
+ </Filter>
+ <Filter Include="FreeRTOS+\FreeRTOS+TCP">
+ <UniqueIdentifier>{8672fa26-b119-481f-8b8d-086419c01a3e}</UniqueIdentifier>
+ </Filter>
+ <Filter Include="FreeRTOS+\FreeRTOS+TCP\portable">
+ <UniqueIdentifier>{4570be11-ec96-4b55-ac58-24b50ada980a}</UniqueIdentifier>
+ </Filter>
+ <Filter Include="FreeRTOS+\FreeRTOS+TCP\include">
+ <UniqueIdentifier>{5d93ed51-023a-41ad-9243-8d230165d34b}</UniqueIdentifier>
+ </Filter>
+ <Filter Include="DemoTasks">
+ <UniqueIdentifier>{b71e974a-9f28-4815-972b-d930ba8a34d0}</UniqueIdentifier>
+ </Filter>
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+ <UniqueIdentifier>{60717407-397f-4ea5-8492-3314acdd25f0}</UniqueIdentifier>
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+ </Filter>
+ </ItemGroup>
+ <ItemGroup>
+ <ClCompile Include="..\..\..\..\FreeRTOS\Source\portable\MSVC-MingW\port.c">
+ <Filter>FreeRTOS\Source\Portable</Filter>
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+ <Filter>FreeRTOS\Source</Filter>
+ </ClCompile>
+ <ClCompile Include="..\..\..\..\FreeRTOS\Source\list.c">
+ <Filter>FreeRTOS\Source</Filter>
+ </ClCompile>
+ <ClCompile Include="..\..\..\..\FreeRTOS\Source\queue.c">
+ <Filter>FreeRTOS\Source</Filter>
+ </ClCompile>
+ <ClCompile Include="..\..\..\..\FreeRTOS\Source\tasks.c">
+ <Filter>FreeRTOS\Source</Filter>
+ </ClCompile>
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+ <Filter>FreeRTOS+\FreeRTOS+TCP</Filter>
+ </ClCompile>
+ <ClCompile Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\FreeRTOS_DHCP.c">
+ <Filter>FreeRTOS+\FreeRTOS+TCP</Filter>
+ </ClCompile>
+ <ClCompile Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\FreeRTOS_DNS.c">
+ <Filter>FreeRTOS+\FreeRTOS+TCP</Filter>
+ </ClCompile>
+ <ClCompile Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\FreeRTOS_Sockets.c">
+ <Filter>FreeRTOS+\FreeRTOS+TCP</Filter>
+ </ClCompile>
+ <ClCompile Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\portable\BufferManagement\BufferAllocation_2.c">
+ <Filter>FreeRTOS+\FreeRTOS+TCP\portable</Filter>
+ </ClCompile>
+ <ClCompile Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\portable\NetworkInterface\WinPCap\NetworkInterface.c">
+ <Filter>FreeRTOS+\FreeRTOS+TCP\portable</Filter>
+ </ClCompile>
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+ <Filter>FreeRTOS+\FreeRTOS+TCP</Filter>
+ </ClCompile>
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+ <Filter>FreeRTOS+\FreeRTOS+TCP</Filter>
+ </ClCompile>
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+ <Filter>FreeRTOS+\FreeRTOS+TCP</Filter>
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+ <Filter>FreeRTOS\Source</Filter>
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+ <Filter>FreeRTOS\Source\Portable</Filter>
+ </ClCompile>
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+ <Filter>FreeRTOS+\FreeRTOS+TCP</Filter>
+ </ClCompile>
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+ <Filter>FreeRTOS\Source</Filter>
+ </ClCompile>
+ <ClCompile Include="..\Common\demo_logging.c" />
+ <ClCompile Include="..\Common\main.c" />
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+ <Filter>DemoTasks</Filter>
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+ </ClCompile>
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+ <Filter>FreeRTOS+\FreeRTOS IoT Libraries\platform</Filter>
+ </ClCompile>
+ </ItemGroup>
+ <ItemGroup>
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\NetworkInterface.h">
+ <Filter>FreeRTOS+\FreeRTOS+TCP\include</Filter>
+ </ClInclude>
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+ <Filter>FreeRTOS+\FreeRTOS+TCP\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_Sockets.h">
+ <Filter>FreeRTOS+\FreeRTOS+TCP\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_UDP_IP.h">
+ <Filter>FreeRTOS+\FreeRTOS+TCP\include</Filter>
+ </ClInclude>
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+ <Filter>FreeRTOS\Source\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\include\event_groups.h">
+ <Filter>FreeRTOS\Source\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\include\FreeRTOS.h">
+ <Filter>FreeRTOS\Source\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\include\queue.h">
+ <Filter>FreeRTOS\Source\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\include\semphr.h">
+ <Filter>FreeRTOS\Source\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\include\task.h">
+ <Filter>FreeRTOS\Source\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\portable\MSVC-MingW\portmacro.h">
+ <Filter>FreeRTOS\Source\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_IP_Private.h">
+ <Filter>FreeRTOS+\FreeRTOS+TCP\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\NetworkBufferManagement.h">
+ <Filter>FreeRTOS+\FreeRTOS+TCP\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_ARP.h">
+ <Filter>FreeRTOS+\FreeRTOS+TCP\include</Filter>
+ </ClInclude>
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+ <Filter>FreeRTOS+\FreeRTOS+TCP\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_IP.h">
+ <Filter>FreeRTOS+\FreeRTOS+TCP\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_TCP_IP.h">
+ <Filter>FreeRTOS+\FreeRTOS+TCP\include</Filter>
+ </ClInclude>
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+ <Filter>FreeRTOS+\FreeRTOS+TCP\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOSIPConfigDefaults.h">
+ <Filter>FreeRTOS+\FreeRTOS+TCP\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\IPTraceMacroDefaults.h">
+ <Filter>FreeRTOS+\FreeRTOS+TCP\include</Filter>
+ </ClInclude>
+ <ClInclude Include="FreeRTOSConfig.h" />
+ <ClInclude Include="FreeRTOSIPConfig.h" />
+ <ClInclude Include="..\..\..\..\FreeRTOS-Plus\Source\FreeRTOS-Plus-TCP\include\FreeRTOS_Stream_Buffer.h">
+ <Filter>FreeRTOS+\FreeRTOS+TCP\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\include\portable.h">
+ <Filter>FreeRTOS\Source\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\..\FreeRTOS\Source\include\projdefs.h">
+ <Filter>FreeRTOS\Source\include</Filter>
+ </ClInclude>
+ <ClInclude Include="demo_config.h" />
+ <ClInclude Include="..\..\..\Source\Application-Protocols\coreMQTT\source\include\core_mqtt_serializer.h">
+ <Filter>FreeRTOS+\FreeRTOS IoT Libraries\standard\coreMQTT\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\Source\Application-Protocols\coreMQTT\source\include\core_mqtt_state.h">
+ <Filter>FreeRTOS+\FreeRTOS IoT Libraries\standard\coreMQTT\include</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\Source\Application-Protocols\coreMQTT\source\include\core_mqtt.h">
+ <Filter>FreeRTOS+\FreeRTOS IoT Libraries\standard\coreMQTT\include</Filter>
+ </ClInclude>
+ <ClInclude Include="core_mqtt_config.h" />
+ <ClInclude Include="..\..\..\Source\Application-Protocols\platform\freertos\transport\include\plaintext_freertos.h">
+ <Filter>FreeRTOS+\FreeRTOS IoT Libraries\platform</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\Source\Application-Protocols\platform\include\transport_interface.h">
+ <Filter>FreeRTOS+\FreeRTOS IoT Libraries\platform</Filter>
+ </ClInclude>
+ <ClInclude Include="..\..\..\Source\Application-Protocols\platform\include\retry_utils.h">
+ <Filter>FreeRTOS+\FreeRTOS IoT Libraries\platform</Filter>
+ </ClInclude>
+ </ItemGroup>
+</Project>
diff --git a/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/core_mqtt_config.h b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/core_mqtt_config.h
new file mode 100644
index 0000000000..acd95955da
--- /dev/null
+++ b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/core_mqtt_config.h
@@ -0,0 +1,67 @@
+/*
+ * FreeRTOS Kernel V10.3.0
+ * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+ */
+#ifndef CORE_MQTT_CONFIG_H
+#define CORE_MQTT_CONFIG_H
+
+/**************************************************/
+/******* DO NOT CHANGE the following order ********/
+/**************************************************/
+
+/* Include logging header files and define logging macros in the following order:
+ * 1. Include the header file "logging_levels.h".
+ * 2. Define the LIBRARY_LOG_NAME and LIBRARY_LOG_LEVEL macros depending on
+ * the logging configuration for MQTT.
+ * 3. Include the header file "logging_stack.h", if logging is enabled for MQTT.
+ */
+
+#include "logging_levels.h"
+
+/* Logging configuration for the MQTT library. */
+#ifndef LIBRARY_LOG_NAME
+ #define LIBRARY_LOG_NAME "MQTT"
+#endif
+
+#ifndef LIBRARY_LOG_LEVEL
+ #define LIBRARY_LOG_LEVEL LOG_NONE
+#endif
+
+#include "logging_stack.h"
+/************ End of logging configuration ****************/
+
+/**
+ * @brief The maximum number of MQTT PUBLISH messages that may be pending
+ * acknowledgement at any time.
+ *
+ * QoS 1 and 2 MQTT PUBLISHes require acknowledgment from the server before
+ * they can be completed. While they are awaiting the acknowledgment, the
+ * client must maintain information about their state. The value of this
+ * macro sets the limit on how many simultaneous PUBLISH states an MQTT
+ * context maintains.
+ */
+#define MQTT_STATE_ARRAY_MAX_COUNT 10U
+
+#endif /* ifndef CORE_MQTT_CONFIG_H */
diff --git a/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/demo_config.h b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/demo_config.h
new file mode 100644
index 0000000000..027ca8ad47
--- /dev/null
+++ b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/demo_config.h
@@ -0,0 +1,126 @@
+/*
+ * FreeRTOS Kernel V10.3.0
+ * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+ */
+
+#ifndef DEMO_CONFIG_H
+#define DEMO_CONFIG_H
+
+/**************************************************/
+/******* DO NOT CHANGE the following order ********/
+/**************************************************/
+
+/* Include logging header files and define logging macros in the following order:
+ * 1. Include the header file "logging_levels.h".
+ * 2. Define the LIBRARY_LOG_NAME and LIBRARY_LOG_LEVEL macros depending on
+ * the logging configuration for DEMO.
+ * 3. Include the header file "logging_stack.h", if logging is enabled for DEMO.
+ */
+
+#include "logging_levels.h"
+
+/* Logging configuration for the Demo. */
+#ifndef LIBRARY_LOG_NAME
+ #define LIBRARY_LOG_NAME "MQTTDemo"
+#endif
+
+#ifndef LIBRARY_LOG_LEVEL
+ #define LIBRARY_LOG_LEVEL LOG_INFO
+#endif
+#include "logging_stack.h"
+
+/************ End of logging configuration ****************/
+
+/**
+ * @brief The MQTT client identifier used in this example. Each client identifier
+ * must be unique so edit as required to ensure no two clients connecting to the
+ * same broker use the same client identifier.
+ *
+ * #define democonfigCLIENT_IDENTIFIER "insert here."
+ */
+
+
+/**
+ * @brief MQTT broker end point to connect to.
+ *
+ * @note For running this demo an MQTT broker, which can be run locally on
+ * the same host is recommended. Any MQTT broker, which can be run on a Windows
+ * host can be used for this demo. However, the instructions below are for
+ * setting up a local Mosquitto broker on a Windows host.
+ * 1. Download Mosquitto from https://mosquitto.org/download/
+ * 2. Install Mosquitto as a Windows service by running the installer.
+ * More details about installing as a Windows service can be found at
+ * https://github.com/eclipse/mosquitto/blob/master/readme-windows.txt and
+ * https://github.com/eclipse/mosquitto/blob/master/readme.md
+ * 3. Verify that Mosquitto server is running locally and listening on port
+ * 1883 by following the steps below.
+ * a. Open Power Shell.
+ * b. Type in command `netstat -a -p TCP | grep 1883` to check if there
+ * is an active connection listening on port 1883.
+ * c. Verify that there is an output as shown below
+ * `TCP 0.0.0.0:1883 <HOST-NAME>:0 LISTENING`
+ * d. If there is no output on step c,go through the Mosquitto documentation
+ * listed above to check if the installation was successful.
+ * 4. Make sure the Mosquitto broker is allowed to communicate through
+ * Windows Firewall. The instructions for allowing an application on Windows 10
+ * Defender Firewall can be found at the link below.
+ * https://support.microsoft.com/en-us/help/4558235/windows-10-allow-an-app-through-microsoft-defender-firewall
+ * After running this MQTT example, consider disabling the Mosquitto broker to
+ * communicate through Windows Firewall for avoiding unwanted network traffic
+ * to your machine.
+ * 5. After verifying that a Mosquitto broker is running successfully, update
+ * the config democonfigMQTT_BROKER_ENDPOINT to the local IP address of the
+ * Windows host machine. Please note that "localhost" or address "127.0.0.1"
+ * will not work as this example is running on a Windows Simulator and not on
+ * Windows host natively. Also note that, if the Windows host is using a
+ * Virtual Private Network(VPN), connection to the Mosquitto broker may not
+ * work.
+ *
+ * As an alternative option, a publicly hosted Mosquitto broker can also be
+ * used as an MQTT broker end point. This can be done by updating the config
+ * democonfigMQTT_BROKER_ENDPOINT to "test.mosquitto.org". However, this is not
+ * recommended due the possible downtimes of the broker as indicated by the
+ * documentation in https://test.mosquitto.org/.
+ *
+ * #define democonfigMQTT_BROKER_ENDPOINT "insert here."
+ */
+
+
+/**
+ * @brief The port to use for the demo.
+ *
+ * #define democonfigMQTT_BROKER_PORT ( insert here. )
+ */
+
+
+/**
+ * @brief Set the stack size of the main demo task.
+ *
+ * In the Windows port, this stack only holds a structure. The actual
+ * stack is created by an operating system thread.
+ */
+#define democonfigDEMO_STACKSIZE configMINIMAL_STACK_SIZE
+
+#endif /* DEMO_CONFIG_H */
diff --git a/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/mqtt_keep_alive_demo.sln b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/mqtt_keep_alive_demo.sln
new file mode 100644
index 0000000000..dcfc1fe098
--- /dev/null
+++ b/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTT_Keep_Alive/mqtt_keep_alive_demo.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29215.179
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "RTOSDemo", "WIN32.vcxproj", "{C686325E-3261-42F7-AEB1-DDE5280E1CEB}"
+EndProject
+Global
+ GlobalSection(SolutionConfigurationPlatforms) = preSolution
+ Debug|Win32 = Debug|Win32
+ EndGlobalSection
+ GlobalSection(ProjectConfigurationPlatforms) = postSolution
+ {C686325E-3261-42F7-AEB1-DDE5280E1CEB}.Debug|Win32.ActiveCfg = Debug|Win32
+ {C686325E-3261-42F7-AEB1-DDE5280E1CEB}.Debug|Win32.Build.0 = Debug|Win32
+ EndGlobalSection
+ GlobalSection(SolutionProperties) = preSolution
+ HideSolutionNode = FALSE
+ EndGlobalSection
+ GlobalSection(ExtensibilityGlobals) = postSolution
+ SolutionGuid = {150F08BF-9D61-4CC2-8DBF-1335172A1EA4}
+ EndGlobalSection
+ GlobalSection(TestCaseManagementSettings) = postSolution
+ CategoryFile = FreeRTOS_Plus_TCP_Minimal.vsmdi
+ EndGlobalSection
+EndGlobal