[SERIAL] Enable SERIAL to X communication (#2068)

Add Serial as a communication layer so as to transmit data to/from serial
Enable discovery of BT sensors through serial
Add serial heartbeat

Change discovery principle for interval and intervalacts, keep them always discovered and deactivate adaptivescan when changed. Instead of removing their discovery when adaptive scan is activated

Increase JSON_MSG_BUFFER_MAX as we are now using const char* and it requires more memory for Arduino Json Deserialization

Co-authored-by: Florian <1technophile@users.noreply.github.com>

main/ZgatewayRF.ino

@@ -106,7 +106,7 @@ void RFtoMQTTdiscovery(uint64_t MQTTvalue) {
 }
 #  endif
 
-void RFtoMQTT() {
+void RFtoX() {
   if (mySwitch.available()) {
     StaticJsonDocument<JSON_MSG_BUFFER> RFdataBuffer;
     JsonObject RFdata = RFdataBuffer.to<JsonObject>();
@@ -160,7 +160,7 @@ void RFtoMQTT() {
 }
 
 #  if simpleReceiving
-void MQTTtoRF(char* topicOri, char* datacallback) {
+void XtoRF(const char* topicOri, const char* datacallback) {
 #    ifdef ZradioCC1101 // set Receive off and Transmitt on
   disableCurrentReceiver();
   ELECHOUSE_cc1101.SetTx(RFConfig.frequency);
@@ -224,7 +224,7 @@ void MQTTtoRF(char* topicOri, char* datacallback) {
 #  endif
 
 #  if jsonReceiving
-void MQTTtoRF(char* topicOri, JsonObject& RFdata) { // json object decoding
+void XtoRF(const char* topicOri, JsonObject& RFdata) { // json object decoding
   if (cmpToMainTopic(topicOri, subjectMQTTtoRF)) {
     Log.trace(F("MQTTtoRF json" CR));
     uint64_t data = RFdata["value"];
@@ -252,7 +252,8 @@ void MQTTtoRF(char* topicOri, JsonObject& RFdata) { // json object decoding
       mySwitch.send(data, valueBITS);
       Log.notice(F("MQTTtoRF OK" CR));
       // we acknowledge the sending by publishing the value to an acknowledgement topic, for the moment even if it is a signal repetition we acknowledge also
-      pub(subjectGTWRFtoMQTT, RFdata);
+      RFdata["origin"] = subjectGTWRFtoMQTT;
+      enqueueJsonObject(RFdata);
       mySwitch.setRepeatTransmit(RF_EMITTER_REPEAT); // Restore the default value
     }