DataSource (C++):
- New optional config: MulticastGroup (e.g. "239.0.0.1") and DataPort
(default Port+1); when set, enables multicast mode; absent = unicast
- Control plane: BasicTCPSocket listener on Port; CONNECT received over
TCP triggers HandleTCPConnect() which sends CONFIG via the same TCP
connection
- Data plane: BasicUDPSocket aimed at MulticastGroup:DataPort; all DATA
fragments sent via dataSocket.Write() so any joined client receives them
- useMulticast is the single branch point; every unicast code path is
unchanged when MulticastGroup is absent
- New methods: HandleTCPConnect(), IsMulticast()
- 5 new unit tests (ports 44710-44729); all 38 tests passing
WebUI hub (Go):
- SourceConfig gains MulticastGroup and DataPort fields (JSON, optional)
- UDPClient gains multicastGroup/dataPort; Run() routes to new
runMulticastSession() when multicastGroup is non-empty
- runMulticastSession(): TCP dial for CONNECT/CONFIG, net.ListenMulticastUDP
for DATA, background goroutine watches TCP for DISCONNECT/close
- All existing sm.Add() call sites updated (unicast callers pass "", 0)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Martino Ferrari