BT Watchdog Timer (#1590)

Implement a BLE scan watchdog to bypass the problem related to the BLE scan hang scan_evt timout

main/main.ino

@@ -1614,6 +1614,7 @@ void loop() {
         stateMeasures();
 #  ifdef ZgatewayBT
         stateBTMeasures(false);
+        btScanWDG();
 #  endif
 #  ifdef ZactuatorONOFF
         stateONOFFMeasures();