bbx10/ESPWebSock.ino

## ESPWebSock.ino
/*
 * ESP8266 Web server with Web Socket to control an LED.
 *
 * The web server keeps all clients' LED status up to date and any client may
 * turn the LED on or off.
 *
 * For example, clientA connects and turns the LED on. This changes the word
 * "LED" on the web page to the color red. When clientB connects, the word
 * "LED" will be red since the server knows the LED is on.  When clientB turns
 * the LED off, the word LED changes color to black on clientA and clientB web
 * pages.
 *
 * References:
 *
 * https://github.com/Links2004/arduinoWebSockets
 *
 */

#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <WebSocketsServer.h>
#include <Hash.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>

static const char ssid[] = "********";
static const char password[] = "***************";
MDNSResponder mdns;

static void writeLED(bool);

ESP8266WiFiMulti WiFiMulti;

ESP8266WebServer server(80);
WebSocketsServer webSocket = WebSocketsServer(81);

static const char PROGMEM INDEX_HTML[] = R"rawliteral(
<!DOCTYPE html>
<html>
<head>
<meta name = "viewport" content = "width = device-width, initial-scale = 1.0, maximum-scale = 1.0, user-scalable=0">
<title>ESP8266 WebSocket Demo</title>
<style>
"body { background-color: #808080; font-family: Arial, Helvetica, Sans-Serif; Color: #000000; }"
</style>
<script>
var websock;
function start() {
  websock = new WebSocket('ws://' + window.location.hostname + ':81/');
  websock.onopen = function(evt) { console.log('websock open'); };
  websock.onclose = function(evt) { console.log('websock close'); };
  websock.onerror = function(evt) { console.log(evt); };
  websock.onmessage = function(evt) {
    console.log(evt);
    var e = document.getElementById('ledstatus');
    if (evt.data === 'ledon') {
      e.style.color = 'red';
    }
    else if (evt.data === 'ledoff') {
      e.style.color = 'black';
    }
    else {
      console.log('unknown event');
    }
  };
}
function buttonclick(e) {
  websock.send(e.id);
}
</script>
</head>
<body onload="javascript:start();">
<h1>ESP8266 WebSocket Demo</h1>
<div id="ledstatus"><b>LED</b></div>
<button id="ledon"  type="button" onclick="buttonclick(this);">On</button>
<button id="ledoff" type="button" onclick="buttonclick(this);">Off</button>
</body>
</html>
)rawliteral";

// GPIO#0 is for Adafruit ESP8266 HUZZAH board. Your board LED might be on 13.
const int LEDPIN = 0;
// Current LED status
bool LEDStatus;

// Commands sent through Web Socket
const char LEDON[] = "ledon";
const char LEDOFF[] = "ledoff";

void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t length)
{
  Serial.printf("webSocketEvent(%d, %d, ...)\r\n", num, type);
  switch(type) {
    case WStype_DISCONNECTED:
      Serial.printf("[%u] Disconnected!\r\n", num);
      break;
    case WStype_CONNECTED:
      {
        IPAddress ip = webSocket.remoteIP(num);
        Serial.printf("[%u] Connected from %d.%d.%d.%d url: %s\r\n", num, ip[0], ip[1], ip[2], ip[3], payload);
        // Send the current LED status
        if (LEDStatus) {
          webSocket.sendTXT(num, LEDON, strlen(LEDON));
        }
        else {
          webSocket.sendTXT(num, LEDOFF, strlen(LEDOFF));
        }
      }
      break;
    case WStype_TEXT:
      Serial.printf("[%u] get Text: %s\r\n", num, payload);

      if (strcmp(LEDON, (const char *)payload) == 0) {
        writeLED(true);
      }
      else if (strcmp(LEDOFF, (const char *)payload) == 0) {
        writeLED(false);
      }
      else {
        Serial.println("Unknown command");
      }
      // send data to all connected clients
      webSocket.broadcastTXT(payload, length);
      break;
    case WStype_BIN:
      Serial.printf("[%u] get binary length: %u\r\n", num, length);
      hexdump(payload, length);

      // echo data back to browser
      webSocket.sendBIN(num, payload, length);
      break;
    default:
      Serial.printf("Invalid WStype [%d]\r\n", type);
      break;
  }
}

void handleRoot()
{
  server.send_P(200, "text/html", INDEX_HTML);
}

void handleNotFound()
{
  String message = "File Not Found\n\n";
  message += "URI: ";
  message += server.uri();
  message += "\nMethod: ";
  message += (server.method() == HTTP_GET)?"GET":"POST";
  message += "\nArguments: ";
  message += server.args();
  message += "\n";
  for (uint8_t i=0; i<server.args(); i++){
    message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
  }
  server.send(404, "text/plain", message);
}

static void writeLED(bool LEDon)
{
  LEDStatus = LEDon;
  // Note inverted logic for Adafruit HUZZAH board
  if (LEDon) {
    digitalWrite(LEDPIN, 0);
  }
  else {
    digitalWrite(LEDPIN, 1);
  }
}

void setup()
{
  pinMode(LEDPIN, OUTPUT);
  writeLED(false);

  Serial.begin(115200);

  //Serial.setDebugOutput(true);

  Serial.println();
  Serial.println();
  Serial.println();

  for(uint8_t t = 4; t > 0; t--) {
    Serial.printf("[SETUP] BOOT WAIT %d...\r\n", t);
    Serial.flush();
    delay(1000);
  }

  WiFiMulti.addAP(ssid, password);

  while(WiFiMulti.run() != WL_CONNECTED) {
    Serial.print(".");
    delay(100);
  }

  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  if (mdns.begin("espWebSock", WiFi.localIP())) {
    Serial.println("MDNS responder started");
    mdns.addService("http", "tcp", 80);
    mdns.addService("ws", "tcp", 81);
  }
  else {
    Serial.println("MDNS.begin failed");
  }
  Serial.print("Connect to http://espWebSock.local or http://");
  Serial.println(WiFi.localIP());

  server.on("/", handleRoot);
  server.onNotFound(handleNotFound);

  server.begin();

  webSocket.begin();
  webSocket.onEvent(webSocketEvent);
}

void loop()
{
  webSocket.loop();
  server.handleClient();
}
	/*
	* ESP8266 Web server with Web Socket to control an LED.
	*
	* The web server keeps all clients' LED status up to date and any client may
	* turn the LED on or off.
	*
	* For example, clientA connects and turns the LED on. This changes the word
	* "LED" on the web page to the color red. When clientB connects, the word
	* "LED" will be red since the server knows the LED is on. When clientB turns
	* the LED off, the word LED changes color to black on clientA and clientB web
	* pages.
	*
	* References:
	*
	* https://github.com/Links2004/arduinoWebSockets
	*
	*/

	#include <ESP8266WiFi.h>
	#include <ESP8266WiFiMulti.h>
	#include <WebSocketsServer.h>
	#include <Hash.h>
	#include <ESP8266WebServer.h>
	#include <ESP8266mDNS.h>

	static const char ssid[] = "********";
	static const char password[] = "***************";
	MDNSResponder mdns;

	static void writeLED(bool);

	ESP8266WiFiMulti WiFiMulti;

	ESP8266WebServer server(80);
	WebSocketsServer webSocket = WebSocketsServer(81);

	static const char PROGMEM INDEX_HTML[] = R"rawliteral(
	<!DOCTYPE html>
	<html>
	<head>
	<meta name = "viewport" content = "width = device-width, initial-scale = 1.0, maximum-scale = 1.0, user-scalable=0">
	<title>ESP8266 WebSocket Demo</title>
	<style>
	"body { background-color: #808080; font-family: Arial, Helvetica, Sans-Serif; Color: #000000; }"
	</style>
	<script>
	var websock;
	function start() {
	websock = new WebSocket('ws://' + window.location.hostname + ':81/');
	websock.onopen = function(evt) { console.log('websock open'); };
	websock.onclose = function(evt) { console.log('websock close'); };
	websock.onerror = function(evt) { console.log(evt); };
	websock.onmessage = function(evt) {
	console.log(evt);
	var e = document.getElementById('ledstatus');
	if (evt.data === 'ledon') {
	e.style.color = 'red';
	}
	else if (evt.data === 'ledoff') {
	e.style.color = 'black';
	}
	else {
	console.log('unknown event');
	}
	};
	}
	function buttonclick(e) {
	websock.send(e.id);
	}
	</script>
	</head>
	<body onload="javascript:start();">
	<h1>ESP8266 WebSocket Demo</h1>
	<div id="ledstatus"><b>LED</b></div>
	<button id="ledon" type="button" onclick="buttonclick(this);">On</button>
	<button id="ledoff" type="button" onclick="buttonclick(this);">Off</button>
	</body>
	</html>
	)rawliteral";

	// GPIO#0 is for Adafruit ESP8266 HUZZAH board. Your board LED might be on 13.
	const int LEDPIN = 0;
	// Current LED status
	bool LEDStatus;

	// Commands sent through Web Socket
	const char LEDON[] = "ledon";
	const char LEDOFF[] = "ledoff";

	void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t length)
	{
	Serial.printf("webSocketEvent(%d, %d, ...)\r\n", num, type);
	switch(type) {
	case WStype_DISCONNECTED:
	Serial.printf("[%u] Disconnected!\r\n", num);
	break;
	case WStype_CONNECTED:
	{
	IPAddress ip = webSocket.remoteIP(num);
	Serial.printf("[%u] Connected from %d.%d.%d.%d url: %s\r\n", num, ip[0], ip[1], ip[2], ip[3], payload);
	// Send the current LED status
	if (LEDStatus) {
	webSocket.sendTXT(num, LEDON, strlen(LEDON));
	}
	else {
	webSocket.sendTXT(num, LEDOFF, strlen(LEDOFF));
	}
	}
	break;
	case WStype_TEXT:
	Serial.printf("[%u] get Text: %s\r\n", num, payload);

	if (strcmp(LEDON, (const char *)payload) == 0) {
	writeLED(true);
	}
	else if (strcmp(LEDOFF, (const char *)payload) == 0) {
	writeLED(false);
	}
	else {
	Serial.println("Unknown command");
	}
	// send data to all connected clients
	webSocket.broadcastTXT(payload, length);
	break;
	case WStype_BIN:
	Serial.printf("[%u] get binary length: %u\r\n", num, length);
	hexdump(payload, length);

	// echo data back to browser
	webSocket.sendBIN(num, payload, length);
	break;
	default:
	Serial.printf("Invalid WStype [%d]\r\n", type);
	break;
	}
	}

	void handleRoot()
	{
	server.send_P(200, "text/html", INDEX_HTML);
	}

	void handleNotFound()
	{
	String message = "File Not Found\n\n";
	message += "URI: ";
	message += server.uri();
	message += "\nMethod: ";
	message += (server.method() == HTTP_GET)?"GET":"POST";
	message += "\nArguments: ";
	message += server.args();
	message += "\n";
	for (uint8_t i=0; i<server.args(); i++){
	message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
	}
	server.send(404, "text/plain", message);
	}

	static void writeLED(bool LEDon)
	{
	LEDStatus = LEDon;
	// Note inverted logic for Adafruit HUZZAH board
	if (LEDon) {
	digitalWrite(LEDPIN, 0);
	}
	else {
	digitalWrite(LEDPIN, 1);
	}
	}

	void setup()
	{
	pinMode(LEDPIN, OUTPUT);
	writeLED(false);

	Serial.begin(115200);

	//Serial.setDebugOutput(true);

	Serial.println();
	Serial.println();
	Serial.println();

	for(uint8_t t = 4; t > 0; t--) {
	Serial.printf("[SETUP] BOOT WAIT %d...\r\n", t);
	Serial.flush();
	delay(1000);
	}

	WiFiMulti.addAP(ssid, password);

	while(WiFiMulti.run() != WL_CONNECTED) {
	Serial.print(".");
	delay(100);
	}

	Serial.println("");
	Serial.print("Connected to ");
	Serial.println(ssid);
	Serial.print("IP address: ");
	Serial.println(WiFi.localIP());

	if (mdns.begin("espWebSock", WiFi.localIP())) {
	Serial.println("MDNS responder started");
	mdns.addService("http", "tcp", 80);
	mdns.addService("ws", "tcp", 81);
	}
	else {
	Serial.println("MDNS.begin failed");
	}
	Serial.print("Connect to http://espWebSock.local or http://");
	Serial.println(WiFi.localIP());

	server.on("/", handleRoot);
	server.onNotFound(handleNotFound);

	server.begin();

	webSocket.begin();
	webSocket.onEvent(webSocketEvent);
	}

	void loop()
	{
	webSocket.loop();
	server.handleClient();
	}