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mallikarjun-kamanakeri
Visitor II
November 11, 2025
Question

Implementing Ethernet MQTT in STM32F407

  • November 11, 2025
  • 2 replies
  • 216 views

Hi Everyone,

I am working on the Project where STM32F407VET6 with External PHY. Configured the ETH and LWIP and I am able to get the IP address. Now I need implement the MQTT in the project. With MQTT command received some task will be performed by the STM MCU. Set up No RTOS used. Any Example of Ethernet MQTT will be Helpful. I think to use MQTT. Which library will be helpful.

Thanks and regards,
Mallikarjun

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    2 replies

    A
    Andrew Neil
    Super User
    November 11, 2025
    @mallikarjun-kamanakeri wrote:

     With MQTT command received some task will be performed by the STM MCU. 

    Not sure what you mean by that?

    "Command received" suggests that you're building a Broker (a "server") ?

    Lots of resources here: 

    https://mqtt.org/

    https://mqtt.org/software/

    M
    mallikarjun-kamanakeriAuthor
    Visitor II
    November 11, 2025

    Hey Andrew,
    Thanks for the reply.
    Command received here refers to that whenever the server publishes MCU should subscribe to that topic and do the task.
    Understand like server publishes the topic called "Trigger_relay". MCU should Subscribe to that topic and Relay should be turned on.
     

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      MStackDev_376
      Graduate
      November 11, 2025

      Hi Mallikarjun,
      I can help you with a suggestion of a baremetal MQTT example for your project.

      You can use the Mongoose Networking Library. It's a lightweight library for embedded systems that's a great fit for this, providing support for many high-level networking protocols, including MQTT. It has a simple, built-in MQTT client API, and it's well-documented here.

      To give you a practical starting point, I have put together a complete CubeIDE project for a very similar board (STM32F429) here. This example runs a simple MQTT client on a bare-metal system.

      A key feature of this project is that it uses Mongoose's own built-in TCP/IP stack, which is a simpler and more lightweight alternative to lwIP, making it ideal for baremetal applications. Since your F407 is very similar to the F429, you can use this project with the .ioc file as a known-good reference for the hardware setup.

      Heads up: I am part of the Mongoose development team. Hope this helps you get your project running.

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