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RTCDataChannel: binaryType property - Web APIs | MDN
A string that can have one of these values:
"blob"
Received binary messages' contents will be contained in Blob
objects.
"arraybuffer"
Received binary messages' contents will be contained in ArrayBuffer
objects.
This code configures a data channel to receive binary data in
ArrayBuffer
objects, and establishes a listener for message
events which constructs a string representing the received data as a list of hexadecimal
byte values.
const dc = peerConnection.createDataChannel("Binary");
dc.binaryType = "arraybuffer";
dc.onmessage = (event) => {
const byteArray = new Uint8Array(event.data);
let hexString = "";
byteArray.forEach((byte) => {
hexString += `${byte.toString(16)} `;
});
};