How to send a message to particular client directly

[timepp]

Hi in our IOT case the server might send direct control message to client. Is that possible in Sedes?

This is how IBM MQ support it:

Do the task, Sending a message to an MQTT client using IBM MQ Explorer to send a message directly from IBM MQ to an MQTT client.

A message sent in this way to an MQTT client is called an unsolicited message. MQTT v3 clients receive unsolicited messages as publications with a topic name set. The telemetry (MQXR) service sets the topic name to the remote queue name.

One possible solution is that each client subscribe to a topic named by its own client ID, but I don't know if this is a good design.

[robertsLando]

You could try to do it as follow:

var client = broker.clients['clientId']

var packet = {
qos: 1,
retain: true,
topic: 'my/topic',
payload: 'Hello world'
}

client.publish(packet, cb)

[gnought]

@timepp can do, please checkout the client.publish method.
The deliverQoS is a internal method and may be changed, not to use it.

[robertsLando]

@gnought You right, I fixed my answer

[timepp]

Thanks!

[cybercoder]

You could try to do it as follow:

var client = broker.clients['clientId']

var packet = {
qos: 1,
retain: true,
topic: 'my/topic',
payload: 'Hello world'
}

client.publish(packet, cb)

There is no clients property.

[robertsLando]

@cybercoder It's there but not typed I think