Minimal-Esp32-Client.ino

/****************************************************************************************************************************
  Minimal-ESP32-Client.ino
  For ESP32.

  Based on and modified from Gil Maimon's ArduinoWebsockets library https://github.com/gilmaimon/ArduinoWebsockets
  to support STM32F/L/H/G/WB/MP1, nRF52 and SAMD21/SAMD51 boards besides ESP8266 and ESP32


  The library provides simple and easy interface for websockets (Client and Server).

  Built by Khoi Hoang https://github.com/khoih-prog/Websockets2_Generic
  Licensed under MIT license

 *****************************************************************************************************************************/
/****************************************************************************************************************************
  ESP32-Minimal-Client: Minimal ESP32 Websockets Client

  This sketch:
        1. Connects to a WiFi network
        2. Connects to a Websockets server
        3. Sends the websockets server a message ("Hello to Server from ......")
        4. Sends the websocket server a "ping"
        5. Prints all incoming messages while the connection is open

    NOTE:
    The sketch dosen't check or indicate about errors while connecting to
    WiFi or to the websockets server. For full example you might want
    to try the example named "ESP32-Client".


  Hardware:
        For this sketch you only need an ESP32 board.

  Originally Created  : 15/02/2019
  Original Author     : By Gil Maimon
  Original Repository : https://github.com/gilmaimon/ArduinoWebsockets

*****************************************************************************************************************************/

#include "defines.h"

#include <WebSockets2_Generic.h>
#include <WiFi.h>

using namespace websockets2_generic;

void onMessageCallback(WebsocketsMessage message)
{
  Serial.print("Got Message: ");
  Serial.println(message.data());
}

void onEventsCallback(WebsocketsEvent event, String data)
{
  (void) data;

  if (event == WebsocketsEvent::ConnectionOpened)
  {
    Serial.println("Connnection Opened");
  }
  else if (event == WebsocketsEvent::ConnectionClosed)
  {
    Serial.println("Connnection Closed");
  }
  else if (event == WebsocketsEvent::GotPing)
  {
    Serial.println("Got a Ping!");
  }
  else if (event == WebsocketsEvent::GotPong)
  {
    Serial.println("Got a Pong!");
  }
}

WebsocketsClient client;

void setup()
{
  Serial.begin(115200);

  while (!Serial && millis() < 5000);

  Serial.print("\nStart Minimal-ESP32-Client on ");
  Serial.println(ARDUINO_BOARD);
  Serial.println(WEBSOCKETS2_GENERIC_VERSION);

  // Connect to wifi
  WiFi.begin(ssid, password);

  // Wait some time to connect to wifi
  for (int i = 0; i < 10 && WiFi.status() != WL_CONNECTED; i++)
  {
    Serial.print(".");
    delay(1000);
  }

  // Check if connected to wifi
  if (WiFi.status() != WL_CONNECTED)
  {
    Serial.println("No Wifi!");
    return;
  }

  Serial.print("Connected to Wifi, Connecting to WebSockets Server @");
  Serial.println(websockets_server_host);

  // run callback when messages are received
  client.onMessage(onMessageCallback);

  // run callback when events are occuring
  client.onEvent(onEventsCallback);

  // Connect to server
  bool connected = client.connect(websockets_server_host, websockets_server_port, "/");

  if (connected)
  {
    Serial.println("Connected!");

    String WS_msg = String("Hello to Server from ") + ARDUINO_BOARD;
    client.send(WS_msg);

    // Send a ping
    client.ping();
  }
  else
  {
    Serial.println("Not Connected!");
  }
}

void loop()
{
  client.poll();
}