ChirpStack Network server supports periodically requesting the Device Status, using the
DevStatusReq mac-command specified by the LoRaWAN® protocol.
A device will respond to this request by sending its battery status
(if available) and its demodulation signal-to-noise ratio in dB
for the last successfully received request.
When the Device Status is available, it will be exposed to the application-server on each received uplink payload.
0 - The end-device is connected to an external power source1..254 - The battery level, 1 being at minimum and 254 being at maximum255 - The end-device was not able to measure the battery levelThe margin (Margin) is the demodulation signal-to-noise ratio in dB rounded to the nearest integer value for the last successfully received DevStatusReq command.