2 - Sending Messages
Messages sent from an end device to a network server via one or more nearby gateways are referred to as uplinks.
In this book, you learn the rules and best practices to follow when sending uplinks from your end device using the LoRaWAN® 1.0.4 specification.
Sending MAC Commands
End Device Time Request (DeviceTimeReq)
The DeviceTimeReq is sent by the end device to request the current network time from the network server. Syncing the device time with the network time can be used to accelerate beacon discovery when enabling Class B mode. Read more in section Request the Network Server Time of the Class B Book.