Network Related Crash on Long Running MQTT connections

I am seeing a crash on the Portenta C33 when using an MQTT client for a long duration (~15 minutes). The crash occurs within the delay call and occurs within the lwip_task of CNetIF.cpp. It certainly looks like we are seeing a memory management issue with the networking code.

We are using an SSL Client and certificates for our server authentication.

Start with CNetIF.cpp and trace the lwip_task path reached during delay on the Portenta C33. Reproduce the crash using a long-running MQTT connection with an SSL client and server certificates, then identify the networking memory-management failure. Done means the connection runs beyond the reported duration without crashing.

Written by the indexing model from the issue text.