Simultanous UDP and TCP Server

[ptschulik]

For an application I want the ESP32 to listen simultaniously to UDP and TCP messages, that should be progressed. My code worked fine with an ESP8286 with an Arduino where I used the CMUX functionality for that.
Now I try to port the code to the ESP32
I managed to complete the code for receiving and processing TCP requests to the ESP32 and the same for UDP.
But when I start the TCP server at port 80 and enable UDP listening at port XXXX only UDP works.

Any idea or suggestion that both functionalities are working parallel?

THANKS FOR YOUR HELP
ptschulik