MQTT ?

Has anyone looked at either porting or writing a MQTT client for RISC OS ?
Not for anything in particular, just interested…

I just did a quick port of Eclipse Mosquitto to see if it would work on RISC OS.

It’s command line only for subscribe and publish. The broker seems to work too. The ‘hello world’ test on the mosquitto gitbhub page worked to a broker running on RISC OS.

There’s a collection of code over on the mbed site.

Has anyone looked at either porting or writing a MQTT client for RISC OS ?

Not until I saw your post.

You can download mosquitto 2.0.11 for RISC OS from here.

It’s only had minimal testing but seems to work OK.

Update mosquitto.conf to set the listener.

listener <port> <ipaddress>

Also set ‘allow_anonymous false’ or create a password file with mosquitto_passwd and set,

password_file <path to password file>

To run the broker use e.g.,

mosquitto -c mosquitto.conf

To test it’s working,

mosquitto_sub -h <ipaddress> -t 'test/topic' -v
mosquitto_pub -h <ipaddress> -t 'test/topic' -m hello world'

You can download mosquitto 2.0.11 for RISC OS from here.

Fast work.

Probably unlikely to become an issue, but I think you need to include the source to match the terms of the licence.
It’s just a simple box ticking exercise, really.

Chris, did you build on RISC OS or cross compile ?

Chris, did you build on RISC OS or cross compile ?

I used the GCCSDK autobuilder to cross compile. The libmosquitto (C and C++) library and it’s dependencies will appear via PackMan soon. It will then be possible to create a RISC OS app that uses it without having to cross compile. There are also some examples in C and C++ included.

Probably unlikely to become an issue, but I think you need to include the source to match the terms of the licence.
It’s just a simple box ticking exercise, really.

The link to the source code is in RiscPkg.Copyright already.

Just to let you know that I have tested with my local MQTT server and have subscribed to both a test feed set up with the library and a “real” feed from my SMART meter.
Now I have to learn how to program in C to write an app for it…

I’ve been playing with MQTT on linux.. now I can play with it from RO too.

Another thing to add to my ever-increasing list of stuff.

Hmm.. I wonder if one of the python libs could be ported.

Finally got an app running using the library…
Many mistakes using “C” but got there in the end.
I have lots of items in my house that talk to an MQTT server on my “Windows 2016 Server Essentials” machine.
I then process them in Node Red and create a simple single MQTT feed .
I have a few shelly devices, mainly door/window2’s and I also get weather info from openweathermap.org. Also I have a Glow IHD with local MQTT send.
I then pick them up and feed into my RISC OS app.


This is just a sample of them!