add publish api

README.md

@@ -71,6 +71,18 @@ void user_init(void)
 	INFO("\r\nSystem started ...\r\n");
 }
 ```
+
+**Publish message**
+
+```c
+void MQTT_Publish(	MQTT_Client *client, 
+					const char* topic, 
+					const char* data, 
+					int data_length, 
+					int qos, 
+					int retain);
+```
+
 **Default configuration**
 See: *user_config.h* and *config.c*
 **Create SSL Self sign**

user/mqtt.c

@@ -377,9 +377,10 @@ mqtt_tcpclient_recon_cb(void *arg, sint8 errType)
 void ICACHE_FLASH_ATTR
 MQTT_Publish(MQTT_Client *client, const char* topic, const char* data, int data_length, int qos, int retain)
 {
-
-  INFO("MQTT: sending publish...\r\n");
-  client->mqtt_state.outbound_message = mqtt_msg_publish(&client->mqtt_state.mqtt_connection,
+	if(client->connState != MQTT_DATA)
+		return;
+	INFO("MQTT: sending publish...\r\n");
+	client->mqtt_state.outbound_message = mqtt_msg_publish(&client->mqtt_state.mqtt_connection,
                                                  topic, data, data_length,
                                                  qos, retain,
                                                  &client->mqtt_state.pending_msg_id);