WebRTC - RTCDataChannel APIs


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WebRTC is not only good at transferring audio and video streams, but any arbitrary data we might have. This is where the RTCDataChannel object comes into play.

RTCDataChannel API

Properties

  • RTCDataChannel.label (read only) − Returns a string containing the data channel name.

  • RTCDataChannel.ordered (read only) − Returns true if the order of delivery of the messages is guaranteed or false if it is not guaranteed.

  • RTCDataChannel.protocol (read only) − Returns a string containing subprotocol name used for this channel.

  • RTCDataChannel.id (read only) − Returns a unique id for the channel which is set at the creation of the RTCDataChannel object.

  • RTCDataChannel.readyState (read only) − Returns the RTCDataChannelState enum representing the state of the connection. The possible values −

    • connecting − Indicates that the connection is not yet active. This is the initial state.

    • open − Indicates that the connection is running.

    • closing − Indicates that the connection is in the process of shutting down. The cached messages are in the process of being sent or received, but no newly created task is accepting.

    • closed − Indicates that the connection could not be established or has been shut down.

  • RTCDataChannel.bufferedAmount (read only) − Returns the amount of bytes that have been queued for sending. This is the amount of data that has not been sent yet via RTCDataChannel.send().

  • RTCDataChannel.bufferedAmountLowThreshold − Returns the number of bytes at which the RTCDataChannel.bufferedAmount is taken up as low. When the RTCDataChannel.bufferedAmount decreases below this threshold, the bufferedamountlow event is fired.

  • RTCDataChannel.binaryType − Returns the type of the binary data transmitted by the connection. Can be “blob” or “arraybuffer”.

  • RTCDataChannel.maxPacketLifeType (read only) − Returns an unsigned short that indicates the length in milliseconds of the window in when messaging is going in unreliable mode.

  • RTCDataChannel.maxRetransmits (read only) − Returns an unsigned short that indicates the maximum number of times a channel will retransmit data if it is not delivered.

  • RTCDataChannel.negotiated (read only) − Returns a boolean that indicates if the channel has been negotiated by the user-agent, or by the application.

  • RTCDataChannel.reliable (read only) − Returns a boolean that indicates of the connection can send messages in unreliable mode.

  • RTCDataChannel.stream (read only) − Synonym for RTCDataChannel.id

Event Handlers

  • RTCDataChannel.onopen − This event handler is called when the open event is fired. This event is sent when the data connection has been established.

  • RTCDataChannel.onmessage − This event handler is called when the message event is fired. The event is sent when a message is available on the data channel.

  • RTCDataChannel.onbufferedamountlow − This event handler is called when the bufferedamoutlow event is fired. This event is sent when RTCDataChannel.bufferedAmount decreases below the RTCDataChannel.bufferedAmountLowThreshold property.

  • RTCDataChannel.onclose − This event handler is called when the close event is fired. This event is sent when the data connection has been closed.

  • RTCDataChannel.onerror − This event handler is called when the error event is fired. This event is sent when an error has been encountered.

Methods

  • RTCDataChannel.close() − Closes the data channel.

  • RTCDataChannel.send() − Sends the data in the parameter over the channel. The data can be a blob, a string, an ArrayBuffer or an ArrayBufferView.



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