SimpleWebSocket.ino

/****************************************************************************************************************************
  SimpleWebSocket.ino - Simple Arduino web server sample for Ethernet shield

  For STM32 with built-in Ethernet LAN8742A (Nucleo-144, DISCOVERY, etc) or W5x00/ENC28J60 shield/module

  EthernetWebServer_STM32 is a library for the STM32 running Ethernet WebServer

  Based on and modified from ESP8266 https://github.com/esp8266/Arduino/releases
  Built by Khoi Hoang https://github.com/khoih-prog/EthernetWebServer_STM32
  Licensed under MIT license
  Simple WebSocket client for HttpClient
  Connects to the WebSocket server, and sends a hello
  message every 5 seconds

  created 28 Jun 2016
  by Sandeep Mistry
  modified 22 Jan 2019
  by Tom Igoe
 *****************************************************************************************************************************/

#include "defines.h"

char serverAddress[] = "echo.websocket.org";  // server address
int port = 80;

EthernetClient  client;
EthernetWebSocketClient wsClient(client, serverAddress, port);

int count = 0;

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

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

  Serial.print("\nStarting SimpleWebSocket on " + String(BOARD_NAME));
  Serial.println(" with " + String(SHIELD_TYPE));

#if USE_ETHERNET_GENERIC
  Serial.println(ETHERNET_GENERIC_VERSION);
#endif

  Serial.println(ETHERNET_WEBSERVER_STM32_VERSION);

#if !(USE_BUILTIN_ETHERNET)
#if (USING_SPI2)
#if defined(CUR_PIN_MISO)
  ET_LOGWARN(F("Default SPI pinout:"));
  ET_LOGWARN1(F("MOSI:"), CUR_PIN_MOSI);
  ET_LOGWARN1(F("MISO:"), CUR_PIN_MISO);
  ET_LOGWARN1(F("SCK:"),  CUR_PIN_SCK);
  ET_LOGWARN1(F("SS:"),   CUR_PIN_SS);
  ET_LOGWARN(F("========================="));
#endif
#else
  ET_LOGWARN(F("Default SPI pinout:"));
  ET_LOGWARN1(F("MOSI:"), MOSI);
  ET_LOGWARN1(F("MISO:"), MISO);
  ET_LOGWARN1(F("SCK:"),  SCK);
  ET_LOGWARN1(F("SS:"),   SS);
  ET_LOGWARN(F("========================="));
#endif
#endif

#if !(USE_BUILTIN_ETHERNET || USE_UIP_ETHERNET)
  // For other boards, to change if necessary
#if ( USE_ETHERNET_GENERIC || USE_ETHERNET_ENC )
  Ethernet.init (USE_THIS_SS_PIN);

#elif USE_CUSTOM_ETHERNET
  // You have to add initialization for your Custom Ethernet here
  // This is just an example to setCSPin to USE_THIS_SS_PIN, and can be not correct and enough
  //Ethernet.init(USE_THIS_SS_PIN);

#endif  //( ( USE_ETHERNET_GENERIC || USE_ETHERNET_ENC )
#endif

  // start the ethernet connection and the server:
  // Use DHCP dynamic IP and random mac
  uint16_t index = millis() % NUMBER_OF_MAC;
  // Use Static IP
  //Ethernet.begin(mac[index], ip);
  Ethernet.begin(mac[index]);

  Serial.print(F("Connected! IP address: "));
  Serial.println(Ethernet.localIP());
}

void loop()
{
  Serial.println("starting WebSocket client");

  wsClient.begin();

  while (wsClient.connected())
  {
    Serial.print("Sending Hello ");
    Serial.println(count);

    // send a hello #
    wsClient.beginMessage(TYPE_TEXT);
    wsClient.print(count);
    String data = " => Hello from SimpleWebSocket on " + String(BOARD_NAME) + ", millis = " + String(millis());
    wsClient.print(data);
    wsClient.endMessage();

    // increment count for next message
    count++;

    // check if a message is available to be received
    int messageSize = wsClient.parseMessage();

    if (messageSize > 0)
    {
      Serial.println("Received a message:");
      Serial.println(wsClient.readString());
    }

    // wait 5 seconds
    delay(5000);
  }

  Serial.println("disconnected");
}