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