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RTCIceCandidate: tcpType property - Web APIs | MDN
If the protocoltcpType has one of the following values:
"active"
The transport will try to open an outbound connection but won't receive incoming connection requests.
"passive"
The transport will receive incoming connection requests but won't try to open an outbound connection.
"so"
The transport will try to open a connection simultaneously with its peer.
tcpType is null for UDP candidates.
In this example, the candidate's protocoltcpType are used to adjust the user interface for simultaneous-open TCP candidates.
if (candidate.protocol === "tcp" && candidate.tcpType === "so") {
adjustForSimultaneousOpen(candidate);
}
