abstract fun writingFrameHandler(handler: Handler<Frame>): StompClientConnection
Configures a handler notified when a frame is going to be written on the wire. This handler can be used from logging, debugging. The handler can modify the received frame.
If a writing frame handler is set on the StompClient, it will be used by all clients connection, so calling this method is useless, except if you want to use a different handler.
Return
the current StompClientConnection