diff --git a/examples/coap_server/Makefile b/examples/coap_server/Makefile
new file mode 100644
index 00000000..0051878b
--- /dev/null
+++ b/examples/coap_server/Makefile
@@ -0,0 +1,126 @@
+#############################################################
+# Required variables for each makefile
+# Discard this section from all parent makefiles
+# Expected variables (with automatic defaults):
+#   CSRCS (all "C" files in the dir)
+#   SUBDIRS (all subdirs with a Makefile)
+#   GEN_LIBS - list of libs to be generated ()
+#   GEN_IMAGES - list of object file images to be generated ()
+#   GEN_BINS - list of binaries to be generated ()
+#   COMPONENTS_xxx - a list of libs/objs in the form
+#     subdir/lib to be extracted and rolled up into
+#     a generated lib/image xxx.a ()
+#
+TARGET = eagle
+#FLAVOR = release
+FLAVOR = debug
+
+#EXTRA_CCFLAGS += -u
+
+ifndef PDIR # {
+GEN_IMAGES= eagle.app.v6.out
+GEN_BINS= eagle.app.v6.bin
+SPECIAL_MKTARGETS=$(APP_MKTARGETS)
+SUBDIRS=    \
+    user
+
+endif # } PDIR
+
+LDDIR = $(SDK_PATH)/ld
+
+CCFLAGS += -Os
+
+TARGET_LDFLAGS =		\
+	-nostdlib		\
+	-Wl,-EL \
+	--longcalls \
+	--text-section-literals
+
+ifeq ($(FLAVOR),debug)
+    TARGET_LDFLAGS += -g -O2
+endif
+
+ifeq ($(FLAVOR),release)
+    TARGET_LDFLAGS += -g -O0
+endif
+
+COMPONENTS_eagle.app.v6 = \
+    user/libuser.a
+
+LINKFLAGS_eagle.app.v6 =    \
+    -L$(SDK_PATH)/lib       \
+    -Wl,--gc-sections       \
+    -nostdlib               \
+    -T$(LD_FILE)            \
+    -Wl,--no-check-sections \
+    -u call_user_start      \
+    -Wl,-static             \
+    -Wl,--start-group       \
+    -lcirom                 \
+    -lgcc                   \
+    -lhal                   \
+    -lcrypto                \
+    -lfreertos              \
+    -llwip                  \
+    -lmain                  \
+    -lnet80211              \
+    -lphy                   \
+    -lpp                    \
+    -lmbedtls               \
+    -lopenssl               \
+    -lcoap                  \
+    -lwpa                   \
+    $(DEP_LIBS_eagle.app.v6)\
+    -Wl,--end-group
+
+DEPENDS_eagle.app.v6 = \
+                $(LD_FILE) \
+                $(LDDIR)/eagle.rom.addr.v6.ld
+
+#############################################################
+# Configuration i.e. compile options etc.
+# Target specific stuff (defines etc.) goes in here!
+# Generally values applying to a tree are captured in the
+#   makefile at its root level - these are then overridden
+#   for a subtree within the makefile rooted therein
+#
+
+#UNIVERSAL_TARGET_DEFINES =		\
+
+# Other potential configuration flags include:
+#	-DTXRX_TXBUF_DEBUG
+#	-DTXRX_RXBUF_DEBUG
+#	-DWLAN_CONFIG_CCX
+#   -DMQTT_TASK: Define MQTT_TASK to enable MQTT start background
+#                thread for a client.
+CONFIGURATION_DEFINES =	-DICACHE_FLASH -DMQTT_TASK
+
+DEFINES +=				\
+	$(UNIVERSAL_TARGET_DEFINES)	\
+	$(CONFIGURATION_DEFINES)
+
+DDEFINES +=				\
+	$(UNIVERSAL_TARGET_DEFINES)	\
+	$(CONFIGURATION_DEFINES)
+
+
+#############################################################
+# Recursion Magic - Don't touch this!!
+#
+# Each subtree potentially has an include directory
+#   corresponding to the common APIs applicable to modules
+#   rooted at that subtree. Accordingly, the INCLUDE PATH
+#   of a module can only contain the include directories up
+#   its parent path, and not its siblings
+#
+# Required for each makefile to inherit from the parent
+#
+INCLUDES := $(INCLUDES) -I $(PDIR)include
+INCLUDES += -I $(SDK_PATH)/third_party/coap/platform/include
+INCLUDES += -I $(SDK_PATH)/third_party/coap/platform/include/coap
+INCLUDES += -I $(SDK_PATH)/third_party/coap/library/include/coap
+sinclude $(SDK_PATH)/Makefile
+
+.PHONY: FORCE
+FORCE:
+
diff --git a/examples/coap_server/gen_misc.sh b/examples/coap_server/gen_misc.sh
new file mode 100755
index 00000000..ced20a09
--- /dev/null
+++ b/examples/coap_server/gen_misc.sh
@@ -0,0 +1,192 @@
+#!/bin/bash
+
+:<<!
+******NOTICE******
+MUST set SDK_PATH & BIN_PATH firstly!!!
+example:
+export SDK_PATH=~/esp_iot_sdk_freertos
+export BIN_PATH=~/esp8266_bin
+!
+
+export SDK_PATH=$SDK_PATH
+export BIN_PATH=$BIN_PATH
+
+echo "gen_misc.sh version 20150911"
+echo ""
+
+if [ $SDK_PATH ]; then
+    echo "SDK_PATH:"
+    echo "$SDK_PATH"
+    echo ""
+else
+    echo "ERROR: Please export SDK_PATH in gen_misc.sh firstly, exit!!!"
+    exit
+fi
+
+if [ $BIN_PATH ]; then
+    echo "BIN_PATH:"
+    echo "$BIN_PATH"
+    echo ""
+else
+    echo "ERROR: Please export BIN_PATH in gen_misc.sh firstly, exit!!!"
+    exit
+fi
+
+echo "Please check SDK_PATH & BIN_PATH, enter (Y/y) to continue:"
+#read input
+input=y
+if [[ $input != Y ]] && [[ $input != y ]]; then
+    exit
+fi
+
+echo ""
+
+echo "Please follow below steps(1-5) to generate specific bin(s):"
+echo "STEP 1: use boot_v1.2+ by default"
+boot=new
+
+echo "boot mode: $boot"
+echo ""
+
+echo "STEP 2: choose bin generate(0=eagle.flash.bin+eagle.irom0text.bin, 1=user1.bin, 2=user2.bin)"
+echo "enter (0/1/2, default 0):"
+#read input
+input=1
+if [ -z "$input" ]; then
+    if [ $boot != none ]; then
+    	boot=none
+	echo "ignore boot"
+    fi
+    app=0
+    echo "generate bin: eagle.flash.bin+eagle.irom0text.bin"
+elif [ $input == 1 ]; then
+    if [ $boot == none ]; then
+    	app=0
+	echo "choose no boot before"
+	echo "generate bin: eagle.flash.bin+eagle.irom0text.bin"
+    else
+	app=1
+        echo "generate bin: user1.bin"
+    fi
+elif [ $input == 2 ]; then
+    if [ $boot == none ]; then
+    	app=0
+	echo "choose no boot before"
+	echo "generate bin: eagle.flash.bin+eagle.irom0text.bin"
+    else
+    	app=2
+    	echo "generate bin: user2.bin"
+    fi
+else
+    if [ $boot != none ]; then
+    	boot=none
+	echo "ignore boot"
+    fi
+    app=0
+    echo "generate bin: eagle.flash.bin+eagle.irom0text.bin"
+fi
+
+echo ""
+
+echo "STEP 3: choose spi speed(0=20MHz, 1=26.7MHz, 2=40MHz, 3=80MHz)"
+echo "enter (0/1/2/3, default 2):"
+#read input
+input=2
+if [ -z "$input" ]; then
+    spi_speed=40
+elif [ $input == 0 ]; then
+    spi_speed=20
+elif [ $input == 1 ]; then
+    spi_speed=26.7
+elif [ $input == 3 ]; then
+    spi_speed=80
+else
+    spi_speed=40
+fi
+
+echo "spi speed: $spi_speed MHz"
+echo ""
+
+echo "STEP 4: choose spi mode(0=QIO, 1=QOUT, 2=DIO, 3=DOUT)"
+echo "enter (0/1/2/3, default 0):"
+#read input
+input=0
+if [ -z "$input" ]; then
+    spi_mode=QIO
+elif [ $input == 1 ]; then
+    spi_mode=QOUT
+elif [ $input == 2 ]; then
+    spi_mode=DIO
+elif [ $input == 3 ]; then
+    spi_mode=DOUT
+else
+    spi_mode=QIO
+fi
+
+echo "spi mode: $spi_mode"
+echo ""
+
+echo "STEP 5: choose spi size and map"
+echo "    0= 512KB( 256KB+ 256KB)"
+echo "    2=1024KB( 512KB+ 512KB)"
+echo "    3=2048KB( 512KB+ 512KB)"
+echo "    4=4096KB( 512KB+ 512KB)"
+echo "    5=2048KB(1024KB+1024KB)"
+echo "    6=4096KB(1024KB+1024KB)"
+echo "    7=4096KB(2048KB+2048KB) not support ,just for compatible with nodeMCU board"
+echo "    8=8192KB(1024KB+1024KB)"
+echo "    9=16384KB(1024KB+1024KB)"
+echo "enter (0/2/3/4/5/6/7/8/9, default 0):"
+#read input
+input=5
+
+if [ -z "$input" ]; then
+    spi_size_map=0
+    echo "spi size: 512KB"
+    echo "spi ota map:  256KB + 256KB"
+elif [ $input == 2 ]; then
+    spi_size_map=2
+    echo "spi size: 1024KB"
+    echo "spi ota map:  512KB + 512KB"
+elif [ $input == 3 ]; then
+    spi_size_map=3
+    echo "spi size: 2048KB"
+    echo "spi ota map:  512KB + 512KB"
+elif [ $input == 4 ]; then
+    spi_size_map=4
+    echo "spi size: 4096KB"
+    echo "spi ota map:  512KB + 512KB"
+elif [ $input == 5 ]; then
+    spi_size_map=5
+    echo "spi size: 2048KB"
+    echo "spi ota map:  1024KB + 1024KB"
+elif [ $input == 6 ]; then
+    spi_size_map=6
+    echo "spi size: 4096KB"
+    echo "spi ota map:  1024KB + 1024KB"
+elif [ $input == 7 ]; then
+    spi_size_map=7
+    echo"not support ,just for compatible with nodeMCU board"
+    exit
+elif [ $input == 8 ]; then
+    spi_size_map=8
+    echo "spi size: 8192KB"
+    echo "spi ota map:  1024KB + 1024KB"
+elif [ $input == 9 ]; then
+    spi_size_map=9
+    echo "spi size: 16384KB"
+    echo "spi ota map:  1024KB + 1024KB"
+else
+    spi_size_map=0
+    echo "spi size: 512KB"
+    echo "spi ota map:  256KB + 256KB"
+fi
+
+echo ""
+
+echo "start..."
+echo ""
+
+make clean
+
+make BOOT=$boot APP=$app SPI_SPEED=$spi_speed SPI_MODE=$spi_mode SPI_SIZE_MAP=$spi_size_map
diff --git a/examples/coap_server/include/user_config.h b/examples/coap_server/include/user_config.h
new file mode 100644
index 00000000..543a5c78
--- /dev/null
+++ b/examples/coap_server/include/user_config.h
@@ -0,0 +1,32 @@
+/*
+ * ESPRESSIF MIT License
+ *
+ * Copyright (c) 2017 <ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD>
+ *
+ * Permission is hereby granted for use on ESPRESSIF SYSTEMS ESP8266 only, in which case,
+ * it is 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.
+ *
+ */
+
+#ifndef __USER_CONFIG_H__
+#define __USER_CONFIG_H__
+
+#define SSID         "BL_841R"        /* Wi-Fi SSID */
+#define PASSWORD     "1234567890"     /* Wi-Fi Password */
+
+#endif
+
diff --git a/examples/coap_server/user/Makefile b/examples/coap_server/user/Makefile
new file mode 100644
index 00000000..244e135d
--- /dev/null
+++ b/examples/coap_server/user/Makefile
@@ -0,0 +1,47 @@
+
+#############################################################
+# Required variables for each makefile
+# Discard this section from all parent makefiles
+# Expected variables (with automatic defaults):
+#   CSRCS (all "C" files in the dir)
+#   SUBDIRS (all subdirs with a Makefile)
+#   GEN_LIBS - list of libs to be generated ()
+#   GEN_IMAGES - list of images to be generated ()
+#   COMPONENTS_xxx - a list of libs/objs in the form
+#     subdir/lib to be extracted and rolled up into
+#     a generated lib/image xxx.a ()
+#
+ifndef PDIR
+GEN_LIBS = libuser.a
+endif
+
+
+#############################################################
+# Configuration i.e. compile options etc.
+# Target specific stuff (defines etc.) goes in here!
+# Generally values applying to a tree are captured in the
+#   makefile at its root level - these are then overridden
+#   for a subtree within the makefile rooted therein
+#
+#DEFINES += 
+DEFINES += -DWITH_POSIX
+#############################################################
+# Recursion Magic - Don't touch this!!
+#
+# Each subtree potentially has an include directory
+#   corresponding to the common APIs applicable to modules
+#   rooted at that subtree. Accordingly, the INCLUDE PATH
+#   of a module can only contain the include directories up
+#   its parent path, and not its siblings
+#
+# Required for each makefile to inherit from the parent
+#
+
+INCLUDES := $(INCLUDES) -I $(PDIR)include
+INCLUDES += -I $(SDK_PATH)/third_party/coap/platform/include
+INCLUDES += -I $(SDK_PATH)/third_party/coap/platform/include/coap
+INCLUDES += -I $(SDK_PATH)/third_party/coap/library/include/coap
+INCLUDES += -I ./
+PDIR := ../$(PDIR)
+sinclude $(PDIR)Makefile
+
diff --git a/examples/coap_server/user/coap_server_example_main.c b/examples/coap_server/user/coap_server_example_main.c
old mode 100644
new mode 100755
index d6b87cbe..65e47fd4
--- a/examples/coap_server/user/coap_server_example_main.c
+++ b/examples/coap_server/user/coap_server_example_main.c
@@ -12,37 +12,29 @@
 
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
-#include "freertos/event_groups.h"
 
-#include "esp_log.h"
 #include "esp_wifi.h"
-#include "esp_event_loop.h"
-
-#include "nvs_flash.h"
-
 #include "coap.h"
 
-/* The examples use simple WiFi configuration that you can set via
-   'make menuconfig'.
+// for libcirom.a
+int _getpid_r(struct _reent *r)
+{
+	return -1;
+ }
+int _kill_r(struct _reent *r, int pid, int sig)
+{
+ 	return -1;
+ }
 
-   If you'd rather not, just change the below entries to strings with
-   the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid"
-*/
-#define EXAMPLE_WIFI_SSID            CONFIG_WIFI_SSID
-#define EXAMPLE_WIFI_PASS            CONFIG_WIFI_PASSWORD
+#define COAP_SERVER_THREAD_NAME         "coap_server_thread"
+#define COAP_SERVER_THREAD_STACK_WORDS  2048
+#define COAP_SERVER_THREAD_PRIO         8
+
+LOCAL xTaskHandle coap_server_handle;
 
 #define COAP_DEFAULT_TIME_SEC 5
 #define COAP_DEFAULT_TIME_USEC 0
 
-static EventGroupHandle_t wifi_event_group;
-
-/* The event group allows multiple bits for each event,
-   but we only care about one event - are we connected
-   to the AP with an IP? */
-const static int CONNECTED_BIT = BIT0;
-
-const static char *TAG = "CoAP_server";
-
 static coap_async_state_t *async = NULL;
 
 static void
@@ -50,7 +42,7 @@ send_async_response(coap_context_t *ctx, const coap_endpoint_t *local_if)
 {
     coap_pdu_t *response;
     unsigned char buf[3];
-    const char* response_data     = "Hello World WTF!";
+    const char* response_data     = "Hello esp8266!";
     size_t size = sizeof(coap_hdr_t) + 20;
     response = coap_pdu_init(async->flags & COAP_MESSAGE_CON, COAP_RESPONSE_CODE(205), 0, size);
     response->hdr->id = coap_new_message_id(ctx);
@@ -90,13 +82,6 @@ static void coap_example_thread(void *p)
     int flags = 0;
 
     while (1) {
-        /* Wait for the callback to set the CONNECTED_BIT in the
-           event group.
-        */
-        xEventGroupWaitBits(wifi_event_group, CONNECTED_BIT,
-                            false, true, portMAX_DELAY);
-        ESP_LOGI(TAG, "Connected to AP");
-
         /* Prepare the CoAP server socket */
         coap_address_init(&serv_addr);
         serv_addr.addr.sin.sin_family      = AF_INET;
@@ -127,7 +112,7 @@ static void coap_example_thread(void *p)
                     } else if (result < 0){
                         break;
                     } else {
-                        ESP_LOGE(TAG, "select timeout");
+                        printf("select timeout\n");
                     }
 
                     if (async) {
@@ -143,50 +128,17 @@ static void coap_example_thread(void *p)
     vTaskDelete(NULL);
 }
 
-static esp_err_t wifi_event_handler(void *ctx, system_event_t *event)
+void user_conn_init(void)
 {
-    switch(event->event_id) {
-    case SYSTEM_EVENT_STA_START:
-        esp_wifi_connect();
-        break;
-    case SYSTEM_EVENT_STA_GOT_IP:
-        xEventGroupSetBits(wifi_event_group, CONNECTED_BIT);
-        break;
-    case SYSTEM_EVENT_STA_DISCONNECTED:
-        /* This is a workaround as ESP32 WiFi libs don't currently
-           auto-reassociate. */
-        esp_wifi_connect();
-        xEventGroupClearBits(wifi_event_group, CONNECTED_BIT);
-        break;
-    default:
-        break;
+    int ret;
+    ret = xTaskCreate(coap_example_thread,
+                      COAP_SERVER_THREAD_NAME,
+                      COAP_SERVER_THREAD_STACK_WORDS,
+                      NULL,
+                      COAP_SERVER_THREAD_PRIO,
+                      &coap_server_handle);
+
+    if (ret != pdPASS)  {
+        printf("create coap server thread %s failed\n", COAP_SERVER_THREAD_NAME);
     }
-    return ESP_OK;
-}
-
-static void wifi_conn_init(void)
-{
-    tcpip_adapter_init();
-    wifi_event_group = xEventGroupCreate();
-    ESP_ERROR_CHECK( esp_event_loop_init(wifi_event_handler, NULL) );
-    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
-    ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
-    ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
-    wifi_config_t wifi_config = {
-        .sta = {
-            .ssid = EXAMPLE_WIFI_SSID,
-            .password = EXAMPLE_WIFI_PASS,
-        },
-    };
-    ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
-    ESP_ERROR_CHECK( esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );
-    ESP_ERROR_CHECK( esp_wifi_start() );
-}
-
-void app_main(void)
-{
-    ESP_ERROR_CHECK( nvs_flash_init() );
-    wifi_conn_init();
-
-    xTaskCreate(coap_example_thread, "coap", 2048, NULL, 5, NULL);
 }
diff --git a/examples/coap_server/user/user_main.c b/examples/coap_server/user/user_main.c
new file mode 100644
index 00000000..3481bbc9
--- /dev/null
+++ b/examples/coap_server/user/user_main.c
@@ -0,0 +1,122 @@
+/*
+ * ESPRESSIF MIT License
+ *
+ * Copyright (c) 2015 <ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD>
+ *
+ * Permission is hereby granted for use on ESPRESSIF SYSTEMS ESP8266 only, in which case,
+ * it is 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.
+ *
+ */
+
+#include "esp_common.h"
+#include "user_config.h"
+
+/******************************************************************************
+ * FunctionName : user_rf_cal_sector_set
+ * Description  : SDK just reversed 4 sectors, used for rf init data and paramters.
+ *                We add this function to force users to set rf cal sector, since
+ *                we don't know which sector is free in user's application.
+ *                sector map for last several sectors : ABCCC
+ *                A : rf cal
+ *                B : rf init data
+ *                C : sdk parameters
+ * Parameters   : none
+ * Returns      : rf cal sector
+*******************************************************************************/
+uint32 user_rf_cal_sector_set(void)
+{
+    flash_size_map size_map = system_get_flash_size_map();
+    uint32 rf_cal_sec = 0;
+
+    switch (size_map) {
+        case FLASH_SIZE_4M_MAP_256_256:
+            rf_cal_sec = 128 - 5;
+            break;
+
+        case FLASH_SIZE_8M_MAP_512_512:
+            rf_cal_sec = 256 - 5;
+            break;
+
+        case FLASH_SIZE_16M_MAP_512_512:
+        case FLASH_SIZE_16M_MAP_1024_1024:
+            rf_cal_sec = 512 - 5;
+            break;
+
+        case FLASH_SIZE_32M_MAP_512_512:
+        case FLASH_SIZE_32M_MAP_1024_1024:
+            rf_cal_sec = 1024 - 5;
+            break;
+        case FLASH_SIZE_64M_MAP_1024_1024:
+            rf_cal_sec = 2048 - 5;
+            break;
+        case FLASH_SIZE_128M_MAP_1024_1024:
+            rf_cal_sec = 4096 - 5;
+            break;
+        default:
+            rf_cal_sec = 0;
+            break;
+    }
+
+    return rf_cal_sec;
+}
+
+void wifi_event_handler_cb(System_Event_t *event)
+{
+    if (event == NULL) {
+        return;
+    }
+
+    switch (event->event_id) {
+        case EVENT_STAMODE_GOT_IP:
+            os_printf("sta got ip ,create task and free heap size is %d\n", system_get_free_heap_size());
+            user_conn_init();
+            break;
+
+        case EVENT_STAMODE_CONNECTED:
+            os_printf("sta connected\n");
+            break;
+
+        case EVENT_STAMODE_DISCONNECTED:
+            wifi_station_connect();
+            break;
+
+        default:
+            break;
+    }
+}
+
+/******************************************************************************
+ * FunctionName : user_init
+ * Description  : entry of user application, init user function here
+ * Parameters   : none
+ * Returns      : none
+*******************************************************************************/
+void user_init(void)
+{
+    os_printf("SDK version:%s %d\n", system_get_sdk_version(), system_get_free_heap_size());
+    wifi_set_opmode(STATION_MODE);
+
+    struct station_config config;
+    bzero(&config, sizeof(struct station_config));
+    sprintf(config.ssid, SSID);
+    sprintf(config.password, PASSWORD);
+    wifi_station_set_config(&config);
+
+    wifi_set_event_handler_cb(wifi_event_handler_cb); 
+
+    wifi_station_connect();
+}
diff --git a/lib/libcoap.a b/lib/libcoap.a
index 027a49cc..a17da47d 100644
Binary files a/lib/libcoap.a and b/lib/libcoap.a differ
diff --git a/third_party/coap/library/Makefile b/third_party/coap/library/Makefile
index 10f4067c..3110901d 100644
--- a/third_party/coap/library/Makefile
+++ b/third_party/coap/library/Makefile
@@ -26,6 +26,7 @@ endif
 #   for a subtree within the makefile rooted therein
 #
 #DEFINES += 
+DEFINES += -DWITH_POSIX
 
 #############################################################
 # Recursion Magic - Don't touch this!!
diff --git a/third_party/coap/library/address.c b/third_party/coap/library/address.c
index bd72069b..15858537 100644
--- a/third_party/coap/library/address.c
+++ b/third_party/coap/library/address.c
@@ -12,6 +12,9 @@
 
 #include "address.h"
 
+#ifndef IN6_IS_ADDR_MULTICAST
+#define IN6_IS_ADDR_MULTICAST(a)    IN_MULTICAST(a)
+#endif
 int 
 coap_address_equals(const coap_address_t *a, const coap_address_t *b) {
   assert(a); assert(b);
diff --git a/third_party/coap/library/coap_time.c b/third_party/coap/library/coap_time.c
index 555a86e5..03bc1112 100644
--- a/third_party/coap/library/coap_time.c
+++ b/third_party/coap/library/coap_time.c
@@ -19,7 +19,7 @@ static coap_time_t coap_clock_offset = 0;
   /* _POSIX_TIMERS is > 0 when clock_gettime() is available */
 
   /* Use real-time clock for correct timestamps in coap_log(). */  
-#define COAP_CLOCK CLOCK_REALTIME
+//#define COAP_CLOCK CLOCK_REALTIME
 #endif
 
 void
diff --git a/third_party/coap/library/debug.c b/third_party/coap/library/debug.c
index d60adb47..da7b8977 100644
--- a/third_party/coap/library/debug.c
+++ b/third_party/coap/library/debug.c
@@ -154,6 +154,10 @@ print_readable( const unsigned char *data, unsigned int len,
 #define min(a,b) ((a) < (b) ? (a) : (b))
 #endif
 
+#ifndef inet_ntop
+#define inet_ntop(af,src,dst,size)     (((af) == AF_INET) ? ipaddr_ntoa_r((const ip_addr_t *)(src),(dst),(size)) : NULL)
+#endif
+
 size_t
 coap_print_addr(const struct coap_address_t *addr, unsigned char *buf, size_t len) {
 #ifdef HAVE_ARPA_INET_H
@@ -163,7 +167,7 @@ coap_print_addr(const struct coap_address_t *addr, unsigned char *buf, size_t le
 
   switch (addr->addr.sa.sa_family) {
   case AF_INET: 
-    addrptr = &addr->addr.sin.sin_addr;
+    addrptr = &addr->addr.sin.sin_addr.s_addr;
     port = ntohs(addr->addr.sin.sin_port);
     break;
   case AF_INET6:
diff --git a/third_party/coap/platform/Makefile b/third_party/coap/platform/Makefile
index 749b4787..e6dbca29 100644
--- a/third_party/coap/platform/Makefile
+++ b/third_party/coap/platform/Makefile
@@ -26,6 +26,7 @@ endif
 #   for a subtree within the makefile rooted therein
 #
 #DEFINES += 
+DEFINES += -DWITH_POSIX
 
 #############################################################
 # Recursion Magic - Don't touch this!!