MQTT-SN RSMB Broker Install and Configuration

Important Note:

The RSMB broker is no longer being actively developed.

There is an MQTT-SN t MQTT Gateway available that is in active development and being supoorted by the original author or the RSMB broker (Ian Graggs).

This post contains the details as well as links to download the gateway and embedded C client.

You can download the RSMB ( Really small message broker here here. Unzip it.

When you unzip it you should see a directory structure like the one below:


Open the RSMB folder and go to the src folder:


In the src folder you will find the source files (.c and .h files), it also contains a Makefile that contains instructions to build the broker.

Navigate to this directory and run make to compile the broker.

Note: On Linux the compiler will already be installed and so this will work. However on Windows you will need the necessary software installed. I have only done this on Linux.

You get two brokers called broker and broker_mqtts.

The broker program only support MQTT over TCP.

The broker_mqtts is the one you need to run MQTT-SN.

I copied the broker files into a directory of their own and created a configuration file called text.txt.

In the configuration file I turned on detailed logging and set the broker port for 1884 just to test it. here is the file.


To run it at a command prompt type.

..broker_mqtts test.txt


Here is a quick getting started guide

64 bit Processors

If you want to run it on a 64 bit processor it may fail with a strange warning that it can’t find the file.

On Ubuntu you need to do the following:


Screen shot above taken from this forum post.

Related Tutorials and Resources:

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