Update powerwall.sh

powerwall.sh

@@ -115,6 +115,7 @@ CHECKTEMPSENSOR(){
 	if [ "${PW_SENSOR_TYPE[${1}]}" == "mqtt" ]; then
 		mqtt_message=`${mqtt_conn} -t tele/${1}/SENSOR -C 1`
 		echo ${mqtt_message} | cut -d':' -f 6 | cut -d',' -f 1 | read temp_c
+		[ "${1}" == "ServerRoomTH" ] && temp_c=`echo "scale=1; ${temp_c}-4" | bc`
 		
 	elif [ "${PW_SENSOR_TYPE[${1}]}" == "system" ]; then
 		temp_c=$(vcgencmd measure_temp)