/* Lab Trial Test 1C
* Name: Guan Jinxiang
* Class:B
* Date: 05/Jul/2024
*/
#include <WiFi.h>
#include <WiFiClient.h>
#include <PubSubClient.h>
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* hostname = "broker.hivemq.com";
WiFiClient espClient;
PubSubClient client(espClient);
const char* espClientName = "IOT/s10245577";
int PORTNUM = 1883;
int LED = 18;
int RLED = 23;
int LEDState = 1;
long previousMillis = 0;
int interval = 1000;
int LEDStateR = 1;
long previousMillisR = 0;
int intervalR = 2000;
void setup_wifi()
{
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.print(".");
}
Serial.println();
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("Given IP by the router to ESP32 is ");
Serial.println(WiFi.localIP());
}
void connectMQTT()
{
while (!client.connected())
{
Serial.println("Connecting to MQTT ...");
if (client.connect(espClientName)) {
Serial.println("Connected");
MQTTSubscribe();
} else {
Serial.print("Failed with state ");
Serial.print(client.state());
delay(2000);
}
}
}
void callback(char* topic, byte* payload, unsigned int length)
{
String messageTemp;
Serial.print("Message received in topic: ");
Serial.print(topic);
Serial.print(" length is: ");
Serial.println(length);
Serial.print("Data received from broker: ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
messageTemp += (char)payload[i];
}
if (strcmp(topic, "IOT/s10245577") == 0)
{
Serial.print("Changing room LED to ");
if (messageTemp == "Off") {
Serial.println(" Off");
} else if (messageTemp == "On") {
Serial.println(" On");
}
}
}
void MQTTSubscribe()
{
}
void setup_MQTT()
{
client.setServer(hostname, PORTNUM);
client.setCallback(callback);
}
void setup()
{ Serial.begin(115200);
delay(5000);
pinMode(18, OUTPUT);
pinMode(23, OUTPUT);
setup_wifi();
setup_MQTT();
}
void loop()
{
if (!client.connected())
{
connectMQTT();
}
client.loop();
long currentMillis = millis();
if(currentMillis - previousMillis >= interval )
{
previousMillis = currentMillis;
if (LEDState == LOW)
{
LEDState = HIGH;
}
else
{
LEDState = LOW;
}
digitalWrite(18, LEDState);
}
if(currentMillis - previousMillisR >= intervalR )
{
previousMillisR = currentMillis;
if (LEDStateR == LOW)
{
LEDStateR = HIGH;
client.publish("IOT/s10245577", "Off");
}
else
{
LEDStateR = LOW;
client.publish("IOT/s10245577", "On");
}
digitalWrite(23, LEDStateR);
}
}