Add TURN TCP transport#331
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This might kind of work, but there are a bunch of issues with the implementation.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
TCP TURN relay entries start in STANDBY when any UDP probe exists (STUN servers or UDP TURN). TCP activates only after all UDP probes have each retransmitted TURN_TCP_FALLBACK_RETRANSMISSIONS times without response, indicating UDP is globally blocked. If any UDP relay succeeds first, TCP is cancelled. - Add AGENT_STUN_ENTRY_STATE_STANDBY and is_tcp_fallback flag - Replace per-pair fallback_entry with global counter-based trigger (O(1) per probe, single O(n) activation scan when all probes report) - Add agent_conn_turn_tcp_state to handle TCP CONNECTED/FAILED callbacks and avoid log spam while waiting for TCP connection - Add juice_get_selected_relay_transport() public API - Expand test_turn_udp_preferred: two scenarios (STUN+TCP and STUN+UDP+TCP) verifying both SERVER and UDP RELAY entries participate in probe count Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Implement TURN relay over TCP (transport=TCP) as an alternative to the default UDP transport. This allows WebRTC connectivity in environments that block UDP entirely.