Home Automation

#include <ESP8266WiFi.h>
#include <PubSubClient.h>

// Update these with values suitable for your network.

const char* ssid = "Weems_2GHz";
const char* password = "1029384756";
const char* mqtt_server = "192.168.1.117"; // IP address of the Broker
uint8_t my_str[6]; // sting to store the incoming data from the publisher
String str;

WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;

void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  randomSeed(micros());

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
    my_str[i] = (char)payload[i];  // copies the payload to my_str
  }
  Serial.println();
  
  String str((char*)my_str); //convert to a string data type/////
  
  // Switch on the LED if an 1 was received as first character
  if ((char)payload[0] == '0') {
    digitalWrite(2, LOW);   // Turn the LED on (Note that LOW is the voltage level
    // but actually the LED is on; this is because
    // it is acive low on the ESP-01)
  } if ((char)payload[0] == '1') {
    digitalWrite(2, HIGH);   // Turn the LED off (Note that LOW is the voltage level
    // but actually the LED is on; this is because
    // it is acive low on the ESP-01)
  }

 if (str == "sprON"){
    digitalWrite(0, LOW); // turn on sprinkler
  }
 if (str == "sprOFF"){
    digitalWrite(0, HIGH); // turn off sprinkler
  }
  clearstring(); // clears the string
 
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP8266Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      client.publish("outTopic", "hello world");
      // ... and resubscribe
      client.subscribe("inTopic");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void setup() {
  pinMode(2, OUTPUT);     // Initialize the BUILTIN_LED pin as an output
  pinMode(0, OUTPUT);
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

void loop() {

  if (!client.connected()) {
    reconnect();
  }
  
  client.loop();
  
}
void clearstring() {
  //Serial.flush(); // clears the buffer, you dont need this
  for (int r=0; r<7; r++){
  my_str[r] = '\0'; // deletes each block
  }
//  my_str[0] = '\0';
//  my_str[1] = '\0';
//  my_str[2] = '\0';
//  my_str[3] = '\0';
//  my_str[4] = '\0';
//  my_str[5] = '\0';
//  my_str[6] = '\0';
}