[Feature Request]: Prevent Duplicate TCP connections

[jake-b]

Platform

ESP32, Cross-Platform, Linux Native

Description

The firmware allows multiple connections to its TCP socket, but the sockets are not partitioned with their own state. This causes connections from multiple devices to fight over the connection.

Two enhancements to mitigate this:

1. Gracefully stop advertising the node over mDNS when a TCP client connects. Ideally sending the proper goodbye packets (https://datatracker.ietf.org/doc/html/rfc6762#section-10.1). mDNS should begin advertising again when the connected TCP client disconnects.
2. If possible, the TCP listener should stop listening when there is an active connection and start listening again when the connection disconnects.

[garthvh]

@caveman99 identifying that a connection exists seems pretty important, I know there were some issues when MUI was launched in identifying other connections, we have added a heartbeat response which seems to help in keeping TCP going but still having trouble with serial and TCP stomping on existing connections, any ideas on how to improve this further?

[github-actions]

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