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
Create / Modify a Channel Answer (NewChannelAns)
The end device sends the NewChannelAns in response to the NewChannelReq command. The NewChannelReq command is sent by the network server to request the creation or modification of the definition of a bidirectional radio channel. The network server also uses the command to disable a radio channel.
The NewChannelAns is sent to indicate whether the command could be applied and identifies if the issue was with the data rate, or the frequency requested.
Note
The NewChannelReq and NewChannelAns commands need only be supported by end devices operating in a region with a dynamic channel plan. Check the channel plan type for the regions in which your end device will operate in Section 1.3, ‘Regional Parameters Summary Tables’ (page 24) of the RP002-1.0.4 LoRaWAN® Regional Parameters specification.
Learn more in Section 5.6, ‘Creation / Modification of a Channel’ (page 36) of the LoRaWAN Link Layer Specification v1.0.4.