DevHeads IoT Integration ServerDIIS
DevHeads IoT Integration Server•2y ago
Daniel kalu

How can I fix the CONNECTION_REFUSED error in my STM32 Nucleo H743ZI2 MQTT setup?

Hey guys could anyone assist me with setting up MQTT communication on my STM32 Nucleo H743ZI2? I need to establish MQTT communication over TCP/IP with another STM32 device. Currently, I am using the standard MQTT library from LWIP, but I am open to alternatives like the PAHO library or others. I can only achieve a TCP connection but get a CONNECTION_REFUSED error when attempting MQTT. I've verified network configurations and broker details. Any guidance or examples would be greatly appreciated.

@Middleware & OS
Solution
To resolve the CONNECTION_REFUSED error and establish MQTT communication:

  • Verify MQTT broker settings
  • Check network connectivity
  • Configure MQTT client correctly
  • Enable debugging for tracing
  • Update LWIP library if necessary
If issues persist, consider firewall/router configurations, broker settings, or network congestion.

Also make sure that the Ethernet port and cable are well appropriately put in place.
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