How to properly setup/close TCP Communication between multiple send-and-recieve participants

[akraus53]

Hi all,
I'm new to Fast-DDS so please be nice if my mistakes seem obvious to you.

This is the setup:
I have four separate agents which each calculate a value and want to exchange it with each other. This should happen for many iterations, then the program stops. Each agent has its own participant with a publisher and a subscriber. In the UDP case, everything seems to work, but when using TCP I get two different errors: ERROR: AddressSanitizer: SEGV on unknown address and [RTCP Error] Cannot find an available logical port. -> Function prepare_send_check_logical_ports_req when one of the programs is done. This happens even if I let the thread sleep for a long time.

I'm wondering now if this happens because one agent, as he stops, closes the port which other agents are still trying to use. So my question is: How do I properly end a program in this case?

I've tried closing or deleting all DataWriters or DataReaders in different orders, using the Domain::stopAll() function or using nothing at all, nothing seems to work.

I'd be very very thankful if anyone could help me out with this. As far as I know there's no example for this case even though it seems pretty common to me.