code: public static <T> void sendPing(final ByteBuffer[] data, final WebSocketChannel wsChannel, final WebSocketCallback<T> callback, T context) {
          sendInternal(mergeBuffers(data), WebSocketFrameType.PING, wsChannel, callback, context, -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
  @param context The context object that will be passed to the callback on completion