[BT] Device Tracker sync across gateways (#2094)

Device Tracker sync across gateways - OpenMQTTGateway & Theengs Gateway

main/config_BT.h

@@ -40,6 +40,7 @@ extern String stateBTMeasures(bool);
 #define subjectBTtoMQTT    "/BTtoMQTT"
 #define subjectMQTTtoBTset "/commands/MQTTtoBT/config"
 #define subjectMQTTtoBT    "/commands/MQTTtoBT"
+#define subjectTrackerSync "internal/trackersync"
 // Uncomment to send undecoded device data to another gateway device for decoding
 // #define MQTTDecodeTopic    "undecoded"
 #ifndef UseExtDecoder
@@ -143,6 +144,10 @@ unsigned long scanCount = 0;
 #  define useBeaconUuidForTopic false // define true to use iBeacon UUID as topic, instead of sender (random) MAC address
 #endif
 
+#ifndef enableMultiGTWSync
+#  define enableMultiGTWSync true // //define true to use tracker and closest control devices sync across OpenMQTTGateway and Theengs Gateway gateways
+#endif
+
 /*--------------HOME ASSISTANT ROOM PRESENCE--------------*/
 #define subjectHomePresence "presence/" // will send Home Assistant room presence message to this topic (first part is same for all rooms, second is room name)