mqtt.exchange - 1 or multiple exchanges per server/cluster?

[Petr N]

Hi,

I am wondering if it is possible to have on 1 server/cluster multiple MQTT exchanges specified in the rabbitmq-env.conf file?

I am trying different formats, but get no success

mqtt.exchange         = [TEST,amq.topic]

mqtt.exchange         = TEST,amq.topic

---

mqtt.exchange         = amq.topic

mqtt.exchange1         = TEST

---

If I specify either

mqtt.exchange         = amq.topic

or

mqtt.exchange        = TEST

everything works fine.

And another question related:

What makes me wonder about this is the fact, that e.g. with Java MQTT paho client I can not find any option where to specify a routing key (I just publish to an exchange, which as per above I can have only 1). So it seems to me, that if I can have only 1 Exchange and a Queue bound to it. Then basically for the MQMT protocol, all message will flow only through this 1 Exchange and Queue without any other routing possible.

Do I understand the concept correctly, or am I missing something?

Thank you very much.

[Petr N]

After some digging I found out how it works, maybe for future reference:

Using 1 Exchange for MQTT protocol

when sending a message with paho client the first parameter is the routing key like this: iMqttClient.publish(routingKey, msg);

As usually, multiple queues may be bound to the exchange.

Dne středa 27. dubna 2022 v 15:02:58 UTC+2 uživatel Petr N napsal: