Settings for an infrequent bridge

Mosquitto MQTT Broker
1

I am looking for the proper mosquito.conf settings for an infrequent bridge connection. I have the bridge part down, but I’m wondering about timeouts, etc.

My situation is I have three brokers that talk to each other. They may do a few changes in an hour - and then none in a week or more. So having them ping each other every 60 seconds seems wrong.

I set the keepalive_interval to 3600, but then started getting problems. My guess is it is some sort of half open tcp connection? Or some other connection issue. When I restart the containers, all work again as planned.

Ideally, I’d like them to just close down the connection - either every time, or after say 5 minutes. The performance hit of reopening connections is unimportant to me.

Sorry if this is obvious but it’s hard to tell if my changes make sense.

2

Hi,

I would suggest using the lazy bridge start type. This only opens the bridge connection if there are messages ready to send to the remote side, then closes the bridge after a timeout.

connection lazybridge
address <host>:<port>
topic mytopic out
start_type lazy
threshold 1
idle_timeout 60

The caveat is that if you need to handle incoming messages then there is no easy way to deal with that.

Regards,

Roger

3

Full details on the options are in here: mosquitto.conf man page | Eclipse Mosquitto

4

That is exactly what I was hoping would exist! But your caveat is super helpfu. That would have bitten me for sure. I guess I need the constant pings to make sure the connection is bi-directional and the roundtrip is quick. Drat. Oh well - it’s only minimal bandwidth.

Thanks @roger.light

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