Mosquitto: An open-source MQTT broker

Re:Mosquitto: An open-source MQTT broker by pletnes on Wednesday September 29, 2021 @12:29PM (#28696011)

I take it mqtt was developed for embedded systems, microcontrollers etc to be lightweight. Can the broker also run in such and environment, or is that just the clients?

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Re:Mosquitto: An open-source MQTT broker by joezydeco on Wednesday September 29, 2021 @12:49PM (#28696329)

I'm running Mosquitto as the central messaging broker on an embedded Linux product right now. It's super lightweight.

Running the broker on the target has been a really great thing during development. I can run validation systems on other machines and inject messages over the wire, or I can actually run the UI on my dev machine and let the backend respond from a live target.

I also have a development team in Asia that can't get to the newest hardware, so I fire up a system here and open a port they can access. They love it.

That said, the bandwidth in MQTT is lightweight but you still need a TCP/IP stack on your system. That's typically more substantial of a footprint than Mosquitto will be at the end of the day.

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Re:Mosquitto: An open-source MQTT broker by ralight on Wednesday September 29, 2021 @04:31PM (#28699519)

The lowest spec device I've come across Mosquitto being used is a 180MHz MIPS processor on 32MB RAM, running Linux.

Someone has recently taken the RSMB broker (from IBM originally) and ported it to the ESP32: https://github.com/DynamicDevices/picobroker I can't comment on what the limitations of that are though.

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Re:Mosquitto: An open-source MQTT broker by zorr on Wednesday September 29, 2021 @12:35PM (#28696106)

Mosquitto is C/C++ without any crazy dependencies so you should be able to do that. I don't immediately see why you would do this though? Any specific use cases?

I haven't done this myself yet but I've seen a couple of production IoT setups with a local MQTT broker running on a RaspberryPi configured to relay all messages to a central broker running in the cloud.

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Re:Mosquitto: An open-source MQTT broker by jvanderbot on Wednesday September 29, 2021 @01:18PM (#28696824)

Pi is a far cry from "Microcontrollers".

MQTT requires a TCP stack, which limits to the higher end chips.

But, for embedded linux, you're probably golden.

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Re:Mosquitto: An open-source MQTT broker by joezydeco on Wednesday September 29, 2021 @05:53PM (#28700471)

MQTT is available via LWIP on STM32 parts that don't have an MMU.

I've tried it on the STM32F746 (Cortex-M7) and it works well, although there are other issues with networking on CubeMX that are open.

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Re:Mosquitto: An open-source MQTT broker by detaro on Wednesday September 29, 2021 @12:46PM (#28696289)

If you don't need it to scale crazily, yes. E.g. microcontrollers in nodes and then a local gateway as an embedded Linux system would not surprise me to see.

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