ChirpStack 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.
For certain regions, ChirpStack supports configuring additional channels Please consult the LoRaWAN Regional Parameters to find out for which regions this applies.
If extra channels are configured, ChirpStack 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
ChirpStack 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 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 will push these changes at the first opportunity to the already activated devices.