RTCIceCandidate.tcpType

The RTCIceCandidate interface's read-only tcpType property is included on TCP candidates to provide additional details about the candidate type.

The tcpType field's value is set from the candidateInfo options object passed to the RTCIceCandidate() constructor. You can't specify the value of tcpType directly in the options object, but its value is automatically extracted from the object's candidate a-line, if it's formatted properly.

Syntax

var tcpType = RTCIceCandidate.tcpType;

Value

If the protocol is "tcp", tcpType 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.

Example

In this example, the candidate's protocol and tcpType are used to adjust the user interface for simultaneous-open TCP candidates.

if (candidate.protocol == "tcp" && candidate.tcpType == "so") {
    adjustForSimultaneousOpen(candidate);
}

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
tcpType
74
79
No
No
62
14.1
74
74
No
53
14.5
11.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/RTCIceCandidate/tcpType