IR signal forwarding by MQTT

differentiate command subject so as to enable the repeat on another gateway
add doc info regarding raw forwarding

main/ZgatewayIR.ino

@@ -173,7 +173,7 @@ void IRtoMQTT() {
       storeValue(MQTTvalue);
       if (repeatIRwMQTT) {
         Log.trace(F("Pub. IR for rpt" CR));
-        pubMQTT(subjectMQTTtoIR, MQTTvalue);
+        pubMQTT(subjectForwardMQTTtoIR, MQTTvalue);
       }
     }
   }

main/config_IR.h

@@ -32,15 +32,16 @@ extern void MQTTtoIR(char* topicOri, char* datacallback);
 extern void MQTTtoIR(char* topicOri, JsonObject& RFdata);
 /*-------------------IR topics & parameters----------------------*/
 //IR MQTT Subjects
-#define subjectGTWIRtoMQTT "/IRtoMQTT"
-#define subjectIRtoMQTT    "/IRtoMQTT"
-#define subjectMQTTtoIR    "/commands/MQTTtoIR"
+#define subjectGTWIRtoMQTT     "/IRtoMQTT"
+#define subjectIRtoMQTT        "/IRtoMQTT"
+#define subjectMQTTtoIR        "/commands/MQTTtoIR"
+#define subjectForwardMQTTtoIR "home/gateway2/commands/MQTTtoIR"
 
 // subject monitored to listen traffic processed by other gateways to store data and avoid ntuple
 #define subjectMultiGTWIR "+/+/IRtoMQTT"
 #define IRbitsKey         "IRBITS_" // bits  will be defined if a subject contains IRbitsKey followed by a value of 2 digits
 #define IRRptKey          "RPT_" // repeats  will be defined if a subject contains IRRptKey followed by a value of 1 digit
-#define repeatIRwMQTT     false // do we repeat a received signal by using mqtt
+#define repeatIRwMQTT     false // do we repeat a received signal by using mqtt, we send a command signal to subjectForwardMQTTtoIR
 #define repeatIRwNumber   0 // default repeat of the signal
 //#define RawDirectForward false // direct repeat of IR signal with raw data
 #define RawFrequency 38 // raw frequency sending