Even when user agents share the same underlying library for handling Stream Control Transmission Protocol (SCTP) data, there can still be variations due to how the library is used. This can complicate things, since you don't necessarily know what the size limits are for various user agents, and how they respond when a larger message is sent or received. At the application level-that is, within the user agent's implementation of WebRTC on which your code is running-the WebRTC implementation implements features to support messages that are larger than the maximum packet size on the network's transport layer. At a fundamental level, the individual network packets can't be larger than a certain value (the exact number depends on the network and the transport layer being used). This makes it easy to write efficient routines that make sure there's always data ready to send without over-using memory or swamping the channel completely.įor any data being transmitted over a network, there are size restrictions. While there's no way to control the size of the buffer, you can learn how much data is currently buffered, and you can choose to be notified by an event when the buffer starts to run low on queued data. WebRTC data channels support buffering of outbound data. In this code snippet, the channel is created with negotiated set to true, then a function called requestRemoteChannel() is used to trigger negotiation, to create a remote channel with the same ID as the local channel.ĭoing this lets you create data channels with each peer using different properties, and to create channels declaratively by using the same value for id. createDataChannel ( "MyApp Channel", ) requestRemoteChannel (dataChannel. The RTCDataChannel object is returned immediately by createDataChannel() you can tell when the connection has been made successfully by watching for the open event to be sent to the RTCDataChannel. This will automatically trigger the RTCPeerConnection to handle the negotiations for you, causing the remote peer to create a data channel and linking the two together across the network. To do this, callĬreateDataChannel() without specifying a value for the negotiated property, or specifying the property with a value of false. Often, you can allow the peer connection to handle negotiating the RTCDataChannel connection for you. Let's look at each of these cases, starting with the first, which is the most common. Write your own code to negotiate the data transport and write your own code to signal to the other peer that it needs to connect to the new channel.This is the easy way, and works for a wide variety of use cases, but may not be flexible enough for your needs. Let WebRTC create the transport and announce it to the remote peer for you (by causing it to receive a datachannel event).The underlying data transport used by the RTCDataChannel can be created in one of two ways: Note: Since all WebRTC components are required to use encryption, any data transmitted on an RTCDataChannel is automatically secured using Datagram Transport Layer Security ( DTLS).
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