Hello everyone, I’m looking for some help getting an Ethernet TCP server running using LwIP with FreeRTOS on an STM32. Current status: Hardware: NUCLEO-H723ZG Stack: LwIP + FreeRTOS Development Environment: STM32CubeMX and STM32CubeIDE TCP client/monitor: Hercules v3.2.8 I can ping the board successfully every time (with Windows terminal and Hercules) However, I cannot establish a TCP connection when FreeRTOS is enabled What’s confusing me is that: If I disable FreeRTOS, I can successfully establish a TCP connection using the CubeMX example LwIP_TCP_Echo_Server Once FreeRTOS is enabled, the TCP connection attempt from Hercules fails (no connection established) What I’ve tried so far: Multiple CubeMX LwIP + FreeRTOS example configurations Both Netconn and Socket-style APIs Adjusting task priorities and stack sizes Verifying IP address, subnet, gateway, and port settings Confirmed Ethernet link is up and LwIP responds to ping At this point, it feels like I’m missing something fundamental about: LwIP threading model with FreeRTOS Proper placement of TCP server code (tcpip thread vs user task) FreeRTOS task priorities or blocking behavior affecting LwIP I’m still fairly new to STM32 development and the STM32Cube/HAL/LwIP ecosystem, so any guidance or common pitfalls would be greatly appreciated. I can provide: CubeMX configuration screenshots Relevant code snippets Hercules configuration screenshots Thanks in advance for any help or direction you can provide!

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Question

NUCLEO-H723ZG + LwIP + FreeRTOS: ping works; no TCP connect

Hello everyone,

I’m looking for some help getting an Ethernet TCP server running using LwIP with FreeRTOS on an STM32.

Current status:

Hardware: NUCLEO-H723ZG
Stack: LwIP + FreeRTOS
Development Environment: STM32CubeMX and STM32CubeIDE
TCP client/monitor: Hercules v3.2.8
I can ping the board successfully every time (with Windows terminal and Hercules)
However, I cannot establish a TCP connection when FreeRTOS is enabled

What’s confusing me is that:

If I disable FreeRTOS, I can successfully establish a TCP connection using the CubeMX example LwIP_TCP_Echo_Server
Once FreeRTOS is enabled, the TCP connection attempt from Hercules fails (no connection established)

What I’ve tried so far:

At this point, it feels like I’m missing something fundamental about:

I’m still fairly new to STM32 development and the STM32Cube/HAL/LwIP ecosystem, so any guidance or common pitfalls would be greatly appreciated.

I can provide:

Thanks in advance for any help or direction you can provide!

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