[lwip-users] LwIP app and multithreading

[Jonathan D]

Hello,

I'm using LwIP 2.1.2 with FreeRTOS on a STM32F777.

I added Websocket support to my device, thanks to this patch : https://savannah.nongnu.org/patch/?9525

In my implementation, when the device receives a message through Websocket, it copies the content for another thread. The other thread interprets the message and then call `http_write`. It works, but `http_write` is not called from the `tcpip_thread` (and ASSERT fails).

Is it OK to just surround the `http_write` caller by `(UN)LOCK_TCPIP_CORE` ?

If not, is there a dedicated function called in the `tcpip_thread` where the device can check if there is something to send ?

I've read about Netconn API but as the connection was not initiated by netconn_new but with `httpd_init`, I don't think that Netconn API can be used in this case.

Thank you for your help,

Jonathan D.