issue 12009, need actual tcp margin value considering restransmission

[todo]

connectedhomeip/src/messaging/ExchangeContext.cpp

Lines 537 to 543 in 05cb801

	// TODO: issue 12009, need actual tcp margin value considering restransmission
	timeout = System::Clock::Seconds16(30);
	}
	return timeout;
	}
	} // namespace Messaging
	} // namespace chip

---

This issue was generated by todo based on a TODO comment in 05cb801 when #11795 was merged. cc @yunhanw-google.