ChirpStack Network Server supports the (re)configuration of the channels used by the device for uplink transmissions. This feature can be used to configure additional uplink channels (e.g. for the EU ISM band), or to enable only a sub-set of the uplink channels specified by the LoRaWAN® Regional Parameters. See also channel configuration.
For certain regions, ChirpStack Network Server supports configuring additional channels Please consult the LoRaWAN Regional Parameters to find out for which regions this applies.
When extra channels are configured, ChirpStack Network Server will configure the first 5 channels by using the OTAA join-accept
CFList field. Additional channels will be configured using the
NewChannelReq mac-command. This mac-command will also be used to push new or updated channel configuration to already activated devices and to (re)configure the min/max data-rate range for these extra channels.
ChirpStack Network Server will by default assume that all available uplink channels specified by the LoRaWAN Regional Parameters are active after an over-the-air activation. As certain regions have more uplink channels than supported by most gateways, it is possible to configure ChirpStack Network Server so that it will only enable a sub-set of the available uplink-channels. Using the
LinkADRReq mac-command it will then update the channelmask of the device.
Note: after changing this setting, ChirpStack Network Server will push these changes at the first opportunity to the already activated devices.