code: public static void sendPing(final ByteBuffer[] data, final WebSocketChannel wsChannel, final WebSocketCallback<Void> callback) {
          sendInternal(mergeBuffers(data), WebSocketFrameType.PING, wsChannel, callback, null, -1);
      }
docs: Sends a complete ping message, invoking the callback when complete
  
  @param data The data to send
  @param wsChannel The web socket channel
  @param callback The callback to invoke on completion