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)

ZgatewayRF.ino

@@ -97,7 +97,7 @@ void RFtoMQTTdiscovery(unsigned long MQTTvalue){//on the fly switch creation fro
 }
 #endif
 
-#ifdef simplePublishing
+#ifdef simpleReceiving
 void MQTTtoRF(char * topicOri, char * datacallback) {
 
   unsigned long data = strtoul(datacallback, NULL, 10); // we will not be able to pass values > 4294967295
@@ -153,7 +153,7 @@ void MQTTtoRF(char * topicOri, char * datacallback) {
 }
 #endif
 
-#ifdef jsonPublishing
+#ifdef jsonReceiving
   void MQTTtoRF(char * topicOri, JsonObject& RFdata) { // json object decoding
   
    if (strcmp(topicOri,subjectMQTTtoRF) == 0){