alex9ufo 聰明人求知心切: ESP32 Web Server & MQTT &Node-RED

ESP32 Web Server & MQTT &Node-RED

#include <WiFi.h>

//================MQTT=====================

#include <PubSubClient.h> //MQTT

// Replace with your network credentials

//const char* ssid = "REPLACE_WITH_YOUR_SSID";

//const char* password = "REPLACE_WITH_YOUR_PASSWORD";

const char* ssid = "TOTOLINK_A3002MU";

const char* password = "24063173";

//================MQTT=====================

const char* mqtt_server = "broker.mqtt-dashboard.com" ; //MQTT

// Set web server port number to 80

WiFiServer server(80);

// Variable to store the HTTP request

String header;

//================MQTT=====================

WiFiClient espClient;

PubSubClient client(espClient);

long lastMsg = 0;

char msg[50];

// Auxiliar variables to store the current output state

String output26State = "off";

String output27State = "off";

// Assign output variables to GPIO pins

const int output26 = 26;

const int output27 = 27;

// Current time

unsigned long currentTime = millis();

// Previous time

unsigned long previousTime = 0;

// Define timeout time in milliseconds (example: 2000ms = 2s)

const long timeoutTime = 2000;

//================MQTT=====================

void callback(char* topic, byte* message, unsigned int length) {

Serial.print("Message arrived on topic: ");

Serial.print(topic);

Serial.print(". Message: ");

String messageTemp;

for (int i = 0; i < length; i++) {

Serial.print((char)message[i]);

messageTemp += (char)message[i];

}

Serial.println();

// Feel free to add more if statements to control more GPIOs with MQTT

// If a message is received on the topic esp32/output, you check if the message is either "on" or "off".

// Changes the output state according to the message

if (String(topic) == "alex96ufo/esp32/input/26") {

Serial.print("Changing output to ");

if(messageTemp == "on"){

Serial.println("on");

output26State = "on";

digitalWrite(output26, HIGH);

}

else if(messageTemp == "off"){

Serial.println("off");

output26State = "off";

digitalWrite(output26, LOW);

}

if (String(topic) == "alex96ufo/esp32/input/27") {

Serial.print("Changing output to ");

if(messageTemp == "on"){

Serial.println("on");

output27State = "on";

digitalWrite(output27, HIGH);

}

else if(messageTemp == "off"){

Serial.println("off");

output27State = "off";

digitalWrite(output27, LOW);

}

loop_mqtt();

}

//================MQTT=====================

void reconnect() {

// Loop until we're reconnected

while (!client.connected()) {

Serial.print("Attempting MQTT connection...");

// Attempt to connect

if (client.connect("ESP32Client")) {

Serial.println("connected");

// Subscribe

client.subscribe("alex9ufo/esp32/input/26");

client.subscribe("alex9ufo/esp32/input/27");

} else {

Serial.print("failed, rc=");

Serial.print(client.state());

Serial.println(" try again in 5 seconds");

// Wait 5 seconds before retrying

delay(5000);

}

//================MQTT=====================

void loop_mqtt(){

if (!client.connected()) {

reconnect();

}

client.loop();

long now = millis();

if (now - lastMsg > 5000) {

lastMsg = now;

char tempString26[4];

char tempString27[4];

output26State.toCharArray(tempString26, 4);

output27State.toCharArray(tempString27, 4);

// Convert the value to a char array

client.publish("alex96ufo/esp32/output/26", tempString26);

client.publish("alex96ufo/esp32/output/27", tempString27);

}

//=========================================

void setup() {

Serial.begin(115200);

// Initialize the output variables as outputs

pinMode(output26, OUTPUT);

pinMode(output27, OUTPUT);

// Set outputs to LOW

digitalWrite(output26, LOW);

digitalWrite(output27, LOW);

// Connect to Wi-Fi network with SSID and password

Serial.print("Connecting to ");

Serial.println(ssid);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {

delay(500);

Serial.print(".");

}

// Print local IP address and start web server

Serial.println("");

Serial.println("WiFi connected.");

Serial.println("IP address: ");

Serial.println(WiFi.localIP());

server.begin();

//================MQTT=====================

client.setServer(mqtt_server, 1883);

client.setCallback(callback);

}

void loop(){

loop_mqtt();

WiFiClient client = server.available(); // Listen for incoming clients

if (client) { // If a new client connects,

currentTime = millis();

previousTime = currentTime;

Serial.println("New Client."); // print a message out in the serial port

String currentLine = ""; // make a String to hold incoming data from the client

while (client.connected() && currentTime - previousTime <= timeoutTime) { // loop while the client's connected

currentTime = millis();

if (client.available()) { // if there's bytes to read from the client,

char c = client.read(); // read a byte, then

Serial.write(c); // print it out the serial monitor

header += c;

if (c == '\n') { // if the byte is a newline character

// if the current line is blank, you got two newline characters in a row.

// that's the end of the client HTTP request, so send a response:

if (currentLine.length() == 0) {

// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)

// and a content-type so the client knows what's coming, then a blank line:

client.println("HTTP/1.1 200 OK");

client.println("Content-type:text/html");

client.println("Connection: close");

client.println();

// turns the GPIOs on and off

if (header.indexOf("GET /26/on") >= 0) {

Serial.println("GPIO 26 on");

output26State = "on";

digitalWrite(output26, HIGH);

} else if (header.indexOf("GET /26/off") >= 0) {

Serial.println("GPIO 26 off");

output26State = "off";

digitalWrite(output26, LOW);

} else if (header.indexOf("GET /27/on") >= 0) {

Serial.println("GPIO 27 on");

output27State = "on";

digitalWrite(output27, HIGH);

} else if (header.indexOf("GET /27/off") >= 0) {

Serial.println("GPIO 27 off");

output27State = "off";

digitalWrite(output27, LOW);

}

// Display the HTML web page

client.println("<!DOCTYPE html><html>");

client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");

client.println("<link rel=\"icon\" href=\"data:,\">");

// CSS to style the on/off buttons

// Feel free to change the background-color and font-size attributes to fit your preferences

client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");

client.println(".button { background-color: #4CAF50; border: none; color: white; padding: 16px 40px;");

client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");

client.println(".button2 {background-color: #555555;}</style></head>");

// Web Page Heading

client.println("<body><h1>ESP32 Web Server</h1>");

// Display current state, and ON/OFF buttons for GPIO 26

client.println("<p>GPIO 26 - State " + output26State + "</p>");

// If the output26State is off, it displays the ON button

if (output26State=="off") {

client.println("<p><a href=\"/26/on\"><button class=\"button\">ON</button></a></p>");

} else {

client.println("<p><a href=\"/26/off\"><button class=\"button button2\">OFF</button></a></p>");

}

// Display current state, and ON/OFF buttons for GPIO 27

client.println("<p>GPIO 27 - State " + output27State + "</p>");

// If the output27State is off, it displays the ON button

if (output27State=="off") {

client.println("<p><a href=\"/27/on\"><button class=\"button\">ON</button></a></p>");

} else {

client.println("<p><a href=\"/27/off\"><button class=\"button button2\">OFF</button></a></p>");

}

client.println("</body></html>");

// The HTTP response ends with another blank line

client.println();

// Break out of the while loop

break;

} else { // if you got a newline, then clear currentLine

currentLine = "";

}

} else if (c != '\r') { // if you got anything else but a carriage return character,

currentLine += c; // add it to the end of the currentLine

}

// Clear the header variable

header = "";

// Close the connection

client.stop();

Serial.println("Client disconnected.");

Serial.println("");

}

alex9ufo 聰明人求知心切

2021年12月27日星期一

ESP32 Web Server & MQTT &Node-RED

沒有留言:

張貼留言

2024_09 作業3 以Node-Red 為主

2021年12月27日 星期一

ESP32 Web Server & MQTT &Node-RED

沒有留言:

張貼留言

2024_09 作業3 以Node-Red 為主

2021年12月27日星期一