Binary(fin: Boolean, data: ByteArray)
Binary(fin: Boolean, packet: ByteReadPacket)
Binary(fin: Boolean, buffer: ByteBuffer)
    fin: Boolean,
    data: ByteArray,
    rsv1: Boolean = false,
    rsv2: Boolean = false,
    rsv3: Boolean = false)

Represents an application level binary frame. In a RAW web socket session a big text frame could be fragmented (separated into several text frames so they have fin = false except the last one). Note that usually there is no need to handle fragments unless you have a RAW web socket session.