Multicast Downlink Data
When adding an MQTT topic for Multicast Downlink Data type, the gateway forwards downlink commands from the MQTT broker to a LoRaWAN® multicast group. This requires that Multicast Groups have been added.
Downlink
Example:
{
"multicastName": "Group1",
"fPort": 85,
"data": "/xD/" //base64 format
}