implement minimum rssi filtering (#482)

main/config_BT.h

@@ -33,6 +33,7 @@ extern void MQTTtoBT(char * topicOri, JsonObject& RFdata);
 #define subjectBTtoMQTT  Base_Topic Gateway_Name "/BTtoMQTT/"
 #define subjectMQTTtoBTset  Base_Topic Gateway_Name "/commands/MQTTtoBT/set"
 #define TimeBtw_Read 55555 //define default time between 2 scans
+#define MinimumRSSI -90 //default minimum rssi value, all the devices below -90 will not be reported
 #define Scan_duration 10 //define the time for a scan
 #define HM-10
 //#define HM-11 // uncomment this line if you use HM-11 and comment the line above
@@ -45,6 +46,7 @@ extern void MQTTtoBT(char * topicOri, JsonObject& RFdata);
 #define subjectHomePresence Base_Topic "home_presence/" Gateway_Name // will send Home Assistant room presence message to this topic (first part is same for all rooms, second is room name)
 
 unsigned int BLEinterval ; //time between 2 scans
+int Minrssi ; //minimum rssi value
 
 struct BLEdevice{
   char macAdr[13];