If you have any suggestions on tutorials or videos then please ask using the comment form below


  1. Steve, thanks for all the great MQTT information. I have mosquito running in a couple places and bridging as well. Also have node-red doing cool stuff (bridging to websocket chat too).

    My question is how might you send big images on say a /bigImage topic, but let others subscribe to a /smallerImage topic? Does MQTT support this or would node-red be a good place to downsize?

    I’ll look for you book too.


  2. Can you please point us in the right direction to set up a working example showing the use of MQTT to receive public data by subscribing to it. Examples could be…
    Background radiation levels, Bus movements, flood warnings etc. Paul

    1. Hi
      I’m not aware of any. The bbc publish subtitles on topic bbc/#
      Hive have a short case study
      I would look for organisations that already make data sets available over http to be sending them over mqtt but I think it is still early days.

    2. Thank You. These commands and topics work for me…
      mosquitto_sub -h -t bbc/subtitles/bbc_one_london/raw
      mosquitto_sub -h -t bbc/subtitles/bbc_two_england/raw
      mosquitto_sub -h -t bbc/subtitles/bbc_news24/raw
      But I would still love to know where there can be found a directory service! Paul

      1. Paul
        There isn’t one. It is a bit like the early days of the internet and then cam Yahoo and then Google.
        As it stands there are no public MQTT content feeds.
        My belief is that in time things like airline,train,bus timetables/arrivals/departure will be published over MQTT as it is far more efficient than http for that kind of data.
        I did a tutorial and video on it.
        Once this happens then there will need to be some agreed topic structure for public data as mention at the bottom of this article

        It is still very early days so I think we have to be patient or inventive

  3. Thank you Steve, I cordially appreciate your efforts to educate us.
    Best regards,
    Sentekin Can, P.E.

  4. Hi Steve,
    First of all, thank you for the great videos you publish. Even though IoT is my daily activity… I learn every day from those videos.
    It would be great to provide some overview of UDP-based IoT protocols which still allow to provide end-to-end acknowledgement, like: MQTT-SN, CoAP, LwM2M, …
    The reason why this is of my interest is because I often use the SIM-based technology called NB-IoT (CAT-NB1). This protocol allows deep indoor penetration and low battery consumption (as long as EDRX and PSM are under control). Often TCP-based traffic is a bit too heavy for NB-IoT.

    1. Hi Steve, I recently discovered your blogs and it helps me a lot. Especially the combination of backgrounds / details and examples is certainly necessary for non-profesional people like me for whom reading the references parts of documentation is a bit too abstract.

      I don’t know if this fits in your scope. I am currently using the Arduino IDE for programming ESP32 and ESP8266 boards. In looking for learning stuff on this I did not yet find sources that combine references and examples in a balanced way. In the Arduino IDE the references part is not very readable. Discussions on practical examples in the community often lack focus and end without conclusions. I am looking for balanced documentation. I would appreciate if you had suggestions for this.

      1. Hi
        Sorry but I haven’t dug too deeply into arduino as I prefer node-red and python. I have a few arduinos just out of curiosity and I wanted too see if I could still program is C.
        I I come across any good material I will post it on the blog.

  5. Hi Steve
    Just wanted to say that I very much appreciate all your mqtt stuff. Great resource. Thank you!

  6. Hi Steve, you developed a great training program and examples on node-red. Thank you very much for sharing your knowledge!
    A subjec, which I feel could be of benefit to the community is,
    to show on node-red dashboards static pictures or icons as well as video clips in various formats, locally stored or externally available via internet or cloud.
    This could be may be combined with home security applications or elderly home care projects.
    What do you think?
    Thanks for your consideration and greeting from Switzerland

  7. Dear Steve,
    I’m very happy with your tutorials.
    What I like to suggest is to create some sort of overview.
    Now many pages have links in it. When I follow the links, I loose the overview.
    I don’t know if that’s possible.

    Kind regards,

  8. hi, steve, i wish for a good video that teaches us to capture adc-sensor readingsand sending them trough mqtt, the only ones i found where arduino’s in c, it would be great having one in python, cheers!

  9. Hello Steve,
    first off, thank you so much providing great content on MQTT, probably the best guide on the net.

    platformIO is another great topic for 2020. It is gaining a lot of popularity as a Arduino IDE on steroids!

    Wishing you the best of 2020!

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