diff --git a/components/lwip/port/esp8266/freertos/sys_arch.c b/components/lwip/port/esp8266/freertos/sys_arch.c
index 91fd6322..e3bc1b4c 100644
--- a/components/lwip/port/esp8266/freertos/sys_arch.c
+++ b/components/lwip/port/esp8266/freertos/sys_arch.c
@@ -59,6 +59,8 @@ struct timeoutlist {
 //static u16_t nextthread = 0;
 int intlevel = 0;
 
+static xTaskHandle s_tcpip_task_handle;
+
 /*-----------------------------------------------------------------------------------*/
 // Initialize sys arch
 void
@@ -365,18 +367,27 @@ sys_now(void)
 sys_thread_t
 sys_thread_new(const char *name, lwip_thread_fn thread, void *arg, int stacksize, int prio)
 {
-    xTaskHandle CreatedTask;
     portBASE_TYPE result;
 
-    result = xTaskCreate(thread, (const char *)name, stacksize, arg, prio, &CreatedTask);
+    result = xTaskCreate(thread, (const char *)name, stacksize, arg, prio, &s_tcpip_task_handle);
 
     if (result == pdPASS) {
-        return CreatedTask;
+        return s_tcpip_task_handle;
     } else {
         return NULL;
     }
 }
 
+int sys_current_task_is_tcpip(void)
+{
+    return xTaskGetCurrentTaskHandle() == s_tcpip_task_handle ? 1 : 0;
+}
+
+char *sys_current_task_name(void)
+{
+    return pcTaskGetTaskName(xTaskGetCurrentTaskHandle());
+}
+
 /*
   This optional function does a "fast" critical region protection and returns
   the previous protection level. This function is only called during very short
diff --git a/components/lwip/port/esp8266/freertos/udp_sync.c b/components/lwip/port/esp8266/freertos/udp_sync.c
index 71ec3e50..4a4039f3 100644
--- a/components/lwip/port/esp8266/freertos/udp_sync.c
+++ b/components/lwip/port/esp8266/freertos/udp_sync.c
@@ -127,9 +127,9 @@ void udp_sync_ack(void *in_msg)
 void udp_sync_set_ret(void *netif, int ret)
 {
     /* Only poll and regitser can set current message */
-    if (!s_cur_msg) {
+    if (!s_cur_msg || !sys_current_task_is_tcpip()) {
         /* You may use it to debug */
-        //ESP_LOGE(TAG, "UDP sync ack error, current message is NULL");
+        //ESP_LOGE(TAG, "UDP sync ack error, current message is %p, task name is %s", s_cur_msg, sys_current_task_name());
         return ;
     }
 
@@ -173,12 +173,29 @@ void udp_sync_proc(void)
             continue;
 
         udp_sync_send(s_udp_sync[i].msg);
-#if 0
-        //Todo: Add this later
-        if (s_udp_sync[i].ret != ERR_OK)
+
+        if (s_udp_sync[i].ret == ERR_MEM)
             break;
-#endif
     }
 }
 
+/*
+ * @brief NULL function and just as sync message
+ */
+static void udp_sync_trigger_null(void *p)
+{
+
+}
+
+/*
+ * @brief trigger a UDP sync process
+ */
+void udp_sync_trigger(void)
+{
+    if (!s_udp_sync_num)
+        return ;
+
+    tcpip_callback_with_block((tcpip_callback_fn)udp_sync_trigger_null, NULL, 0);
+}
+
 #endif /* ESP_UDP */
diff --git a/components/lwip/port/esp8266/include/arch/sys_arch.h b/components/lwip/port/esp8266/include/arch/sys_arch.h
index 8bf1b568..4b3bd8a8 100644
--- a/components/lwip/port/esp8266/include/arch/sys_arch.h
+++ b/components/lwip/port/esp8266/include/arch/sys_arch.h
@@ -57,6 +57,10 @@ void sys_thread_sem_deinit(void);
 sys_sem_t* sys_thread_sem_get(void);
 err_t sys_mutex_trylock(sys_mutex_t *pxMutex);
 
+int sys_current_task_is_tcpip(void);
+
+char *sys_current_task_name(void);
+
 #define LWIP_NETCONN_THREAD_SEM_ALLOC() sys_thread_sem_init()
 #define LWIP_NETCONN_THREAD_SEM_FREE()  sys_thread_sem_deinit()
 #define LWIP_NETCONN_THREAD_SEM_GET()   sys_thread_sem_get()
diff --git a/components/lwip/port/esp8266/include/udp_sync.h b/components/lwip/port/esp8266/include/udp_sync.h
index b1040d49..055361e3 100644
--- a/components/lwip/port/esp8266/include/udp_sync.h
+++ b/components/lwip/port/esp8266/include/udp_sync.h
@@ -52,6 +52,11 @@ void udp_sync_set_ret(void *netif, int ret);
  */
 void udp_sync_proc(void);
 
+/*
+ * @brief trigger a UDP sync process
+ */
+void udp_sync_trigger(void);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/components/lwip/port/esp8266/netif/ethernetif.c b/components/lwip/port/esp8266/netif/ethernetif.c
index 8ec20eca..1c3edf90 100644
--- a/components/lwip/port/esp8266/netif/ethernetif.c
+++ b/components/lwip/port/esp8266/netif/ethernetif.c
@@ -238,6 +238,8 @@ static int low_level_send_cb(esp_aio_t* aio)
 
     pbuf_free(pbuf);
 
+    udp_sync_trigger();
+
     return 0;
 }