differentiate receiving and publishing mqtt for the new json option in user_config.h

#318 so as to avoid user with non modified controllers to have regression on receiving (per default receiving is activated for both json and simple and prioritary analysed for json)

OpenMQTTGateway.ino

@@ -878,7 +878,7 @@ void receivingMQTT(char * topicOri, char * datacallback) {
    #ifdef ZgatewayPilight // ZgatewayPilight is only defined with json publishing
      MQTTtoPilight(topicOri, jsondata);
    #endif
-   #ifdef jsonPublishing
+   #ifdef jsonReceiving
     #ifdef ZgatewayRF
       MQTTtoRF(topicOri, jsondata);
     #endif
@@ -905,7 +905,7 @@ void receivingMQTT(char * topicOri, char * datacallback) {
       MQTTtoONOFF(topicOri, jsondata);
     #endif
   } else { // not a json object --> simple decoding
-   #ifdef simplePublishing
+   #ifdef simpleReceiving
       #ifdef ZgatewayRF
         MQTTtoRF(topicOri, datacallback);
       #endif