Add option to offload decoding to an external gateway over MQTT. (#1216)

* Add option to offload decoding to an external gateway over MQTT.

* Change decode topic and add to config_bt

main/User_config.h

@@ -1,17 +1,17 @@
-/*  
-  OpenMQTTGateway  - ESP8266 or Arduino program for home automation 
+/*
+  OpenMQTTGateway  - ESP8266 or Arduino program for home automation
 
-   Act as a wifi or ethernet gateway between your 433mhz/infrared IR signal  and a MQTT broker 
+   Act as a wifi or ethernet gateway between your 433mhz/infrared IR signal  and a MQTT broker
    Send and receiving command by MQTT
- 
+
   This program enables to:
  - receive MQTT data from a topic and send signals corresponding to the received MQTT data
  - publish MQTT data to a different topic related to received signals
-  
+
     Copyright: (c)Florian ROBERT
-  
+
     This file is part of OpenMQTTGateway.
-    
+
     OpenMQTTGateway is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
@@ -41,11 +41,11 @@
  * - mqtt_pass
  * - mqtt_server
  * - mqtt_port
- * 
+ *
  * To completely disable WifiManager, define ESPWifiManualSetup.
  * If you do so, please don't forget to set these variables before compiling
- * 
- * Otherwise you can provide these credentials on the web interface after connecting 
+ *
+ * Otherwise you can provide these credentials on the web interface after connecting
  * to the access point with your password (SSID: WifiManager_ssid, password: WifiManager_password)
  */
 /*-------------DEFINE GATEWAY NAME BELOW IT CAN ALSO BE DEFINED IN platformio.ini----------------*/
@@ -172,6 +172,10 @@ const byte mac[] = {0xDE, 0xED, 0xBA, 0xFE, 0x54, 0x95}; //W5100 ethernet shield
 #endif
 
 #if defined(ESP8266) || defined(ESP32)
+// Uncomment to use a device running TheengsGateway to decode BLE data. (https://github.com/theengs/gateway)
+// Set the topic to the subscribe topic configured in the TheengGateway
+// #define MQTTDecodeTopic "MQTTDecode"
+
 // The root ca certificate used for validating the MQTT broker
 // The certificate must be in PEM ascii format
 const char* certificate PROGMEM = R"EOF("