Auto Discovery of MQTT Client Paho devices, topics and subscribe

[ashok athukuri]

Is there any way to auto discover mqtt devices know its capabilities and then subscribe to topics of that device? Not sure its a valid question But I have a working environment with statically subscribed devices. Looking for some kind of auto discovering thing.

Thanks,

Ashok

[Dougie Lawson]

If you create /etc/avahi/services/mqtt.service

<?xml version="1.0" standalone='no'?>
<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
<service-group>
 <name replace-wildcards="yes">MQTT on %h</name>
  <service>
   <type>_mqtt._tcp</type>
   <port>1883</port>
  </service>
</service-group>

Then the Avahi (Bonjour) daemon will announce your MQTT service for auto-configuration.

Regards, Dougie

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[shirou]

I think auto discovery is not in the MQTT specification, but you can use DNS.

For example, mosquitto client has an -S option to use SRV record to
determine which host to connect to.

If you want to know not only MQTT server hostname but also other
things like topics, you should create your own discovery service.

WAKAYAMA Shirou