ESP8266 MQTT keypad

gistfile1.txt

#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
#include <ArduinoOTA.h>
#include <PubSubClient.h>


const char* ssid = "yourwifiname";//put your wifi ssid here
const char* password = "yourwifipass";//put your wifi password here.
const char* mqtt_topic = "keypad";
const char* mqtt_server = "mqttserverhostname.example.com";
const char* HOSTNAME = "keypad";
const int pins[9] = {D0,D1,D2,A0,10,D5,D6,D7,D8};
int keepAlive = 0;

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

void setup_wifi() {
  delay(10);
  WiFi.mode(WIFI_STA);
  // Advertise the hostname to the DHCP server
  WiFi.hostname(HOSTNAME);
  WiFi.begin(ssid, password);
  while (WiFi.waitForConnectResult() != WL_CONNECTED) {
    Serial.println("Connection Failed! Rebooting...");
    delay(5000);
    ESP.restart();
  }
  //Setup OTA
  ArduinoOTA.setHostname(HOSTNAME);
  // No authentication by default
  // ArduinoOTA.setPassword((const char *)"123");

  ArduinoOTA.onStart([]() {
    Serial.println("Start");
  });
  ArduinoOTA.onEnd([]() {
    Serial.println("\nEnd");
  });
  ArduinoOTA.onProgress([](unsigned int progress, unsigned int total) {
    Serial.printf("Progress: %u%%\r", (progress / (total / 100)));
  });
  ArduinoOTA.onError([](ota_error_t error) {
    Serial.printf("Error[%u]: ", error);
    if (error == OTA_AUTH_ERROR) Serial.println("Auth Failed");
    else if (error == OTA_BEGIN_ERROR) Serial.println("Begin Failed");
    else if (error == OTA_CONNECT_ERROR) Serial.println("Connect Failed");
    else if (error == OTA_RECEIVE_ERROR) Serial.println("Receive Failed");
    else if (error == OTA_END_ERROR) Serial.println("End Failed");
  });
  ArduinoOTA.begin();

  // Print local IP infos
  Serial.println("Ready");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

}

void setup() {
  // Setup Serial
  Serial.begin(115200);
  Serial.println("Booting");
  // Setup WiFi
  setup_wifi();

  // Initilize MQTT specific things
  client.setServer(mqtt_server, 1883);
  for (int i = 0; i <= 8; i++) {
    Serial.print("Now enabling pin ");
    Serial.println(pins[i]);


    pinMode(pins[i],INPUT);
  }
}

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


void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  for (int i = 0; i <= 8; i++) {
    int readout;
    if (pins[i] == A0) {
      if (analogRead(pins[i]) > 512) {
        readout = 1;
      } else {
        readout = 0;
      }
    } else {
      readout = digitalRead(pins[i]);
    }
    if ( readout == 1) {
      char *message = "0";
      message[0] += i;
       Serial.println(message);
      client.publish(mqtt_topic, message);
    }
  }
  delay(200);
  keepAlive++;
  if ( keepAlive == 20 ) {
    client.publish(mqtt_topic, mqtt_topic);
    Serial.println("Sending keepalive");
    keepAlive = 0;
  }

}