ChirpStack Network Server supports the synchronization of the internal device clock with the network using the
DeviceTimeReq mac-command. This is useful for devices that need to have an accurate time-source or devices implementing LoRaWAN® Class-B.
When possible, ChirpStack Network Server uses the RX timestamp provided by the gateway which results in the most accurate time. When this timestamp is not available (e.g. the gateway is not time synchronized), it will use the current server time. Please note that in this case the returned timestamp is less accurate as ChirpStack Network Server is not aware of the latency between the gateway and the network-server.