armMoistureSensor()
Enable RH or soil moisture monitoring, depending on the type of the sensor. To change thresholds, use
setMoistureSensorThresholds, which will call this method automatically if monitoring is not enabled.
Arguments
none.
Returns
If successful, will return a tag object with updated signal strength (
rssi), battery voltage,
txpwr, etc. If tag did not respond, will return null.