Downlink Data

When adding an MQTT topic for Downlink Data type, the gateway forwards the downlink commands from the MQTT broker to end devices. To send commands to a specific end device, add the wildcard $devEUI to the MQTT topic, then replace it with the device EUI when subscribing to this topic.

A downlink message is a JSON object containing the following fields:


Parameter	Type	Description
confirmed	boolean	Whether asking the end device to send a confirmed reply.
fPort	integer	Device application port. Range: 1-223.
data	string	Downlink payload in Base64 format.

Downlink Example

{
  "confirmed": false,
  "fPort": 85,
  "data": "/xD/"
}