Add advised duration and time between reading (#1069)

platformio.ini

@@ -406,8 +406,9 @@ build_flags =
   '-DLED_SEND_RECEIVE_ON=0'
   '-DGateway_Name="OpenMQTTGateway_LOLIN32LITE_BLE"'
 ;; Low power parameters, uncomment and fill credentials
-;  '-DDEFAULT_LOW_POWER_MODE=0'
-;  '-DTimeBtwRead=550000'
+;  '-DDEFAULT_LOW_POWER_MODE=2'
+;  '-DTimeBtwRead=155000'
+;  '-DScan_duration=2000'
 ;  '-DAttemptBLECOnnect=false'
 ;  '-DActiveBLEScan=false'
 ;  '-DESPWifiManualSetup=true'