boolean belongsTo(StableWebSocket socket) {
   return this.socket.getId().equals(socket.getId());
 }
 public void send(JSONObject msg) throws IOException {
   msg.put("$dst", peerId);
   msg.put("$src", id);
   socket.sendMessage(msg.toJSONString());
 }
 public static String makeUniqueId(StableWebSocket socket, String id) {
   return id + "@" + socket.getId();
 }