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Shreayas_Acharaya
Graduate
January 3, 2025
Question

Inquiry on mbedTLS Handshake Time and Optimization for AWS MQTT on STM32

  • January 3, 2025
  • 1 reply
  • 951 views

Dear Community,

I am working with an STM32F407 development board, using an ESP32 as a Wi-Fi modem controlled through AT commands. I am attempting to perform an MQTT test with AWS IoT using mbedTLS for the TLS handshake.

I found the following mbedTLS implementation for STM32:
https://github.com/eziya/STM32F4_HAL_ETH_MBEDTLS.

Currently, I am observing that the mbedTLS handshake takes nearly 25 seconds. Can anyone share how much time the mbedTLS handshake typically takes with a server using this implementation or similar setups?

Additionally, I am currently stuck on configuring mbedTLS. Could anyone guide me on the minimal and fastest way to establish a TLS handshake with an AWS server? Any suggestions to optimize the process for MQTT communication would be highly appreciated.

Thank you in advance for your assistance.

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    1 reply

    G
    grd
    ST Employee
    February 12, 2025

    Hi,

    on an average STM32 MCU, the TLS handshake with AWS IoT Core can take a couple of seconds.

    It obviously also depends on the network link quality to the AWS broker.

     

    The X-CUBE-AWS* STM32Cube Expansion packs include application examples based on mbedTLS, which connect to AWS IoT Core. You may want to look at their MbedTLS configuration file.

    A possible reference is the 'aws_eth' example application of X-CUBE-AWS-H5.

     

     

     

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