expand command about mqtt-launcher HOT 4 CLOSED

I think we use exec() and not shell, so no, that wouldn't work.

If you'll pardon my question? What on earth are you doing? ;-) A subscribe when a publish occurs in order to publish it? I had to wrap my head around that one ...

What are you attempting to accomplish?

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@jpmens I can understand your confusion :-)
I have this setup:

remote clients -> remote broker 1 <--bridge--> local broker
remote clients -> remote broker 2 <--bridge--> local broker
remote clients -> remote broker 3 <--bridge--> local broker

The assumption is that I cannot query the remote brokers directly (nor do I want to since I would like the setup to be agnostic).

I need to know from my local broker how many clients are connected to each of my remote brokers.

With my "twisted" setup I issue a publish on my local broker which is bridged to all my remote brokers so that mqtt-launcher queries the remote brokers locally and publishes the results on an identifiable topic which is then bridged back to my local broker.

I tried configuring mqtt-launcher with a local payload that triggers a mosquitto_sub -t $SYS/broker/clients/connected on the remote broker and reading the output from the report topic on the local broker. But I have no way of associating the output to the remote broker.

I pretty new to MQTT so I'm sure there's a better way of doing this. Any suggestion would be much appreciated :-)

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My head hurts. :-)

I think this is the main sentence:

I need to know from my local broker how many clients are connected to each of my remote brokers.

What I'd do is brigde in the appropriate $SYS/ branch of the remote broker into a broker-specific branch on your local broker; you can then query the values locally. Look around this topic

$SYS/broker/clients/connected 751

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Ah, I totally overlooked topic remapping.
Thanks for the tip!

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