PingPong Client feature

[osbarciela]

Pull Request Description

Summary

This Pull Request introduces improvements in WebSocket connection management on the ESP32 client. Functionalities have been added to handle receiving pongs from the server.

Changes Made

1. Added the onPong method in `WebSocketClient:

   • The onPong method has been declared and defined in WebSocketClient to handle receiving pongs from the server.
   • The onPongCallback callback signature has been corrected to match the lambda used.

2. Handling PONG frames in WebSocket::

   • In WebSocket.cpp, a case has been added to handle frames of type PONG_FRAME and call the _onPing callback.

Modified Files

• WebSocketClient.h:

  void onPong(const onPingCallback &);

• WebSocketClient.cpp:

  void WebSocketClient::onPong(const onPingCallback &callback) {
    _onPing = callback;
  }

• WebSocket.cpp:

  case Opcode::PONG_FRAME: {
    if (_onPing) {
      _onPing(*this, payload, header.length);
    }
    break;
  }

Tests Performed

• It has been verified that the client receives pongs from the server and calls the _onPing callback.