MQTT Mailbox Notification (battery-powered)

[afe]

#define SENSORNAME "mailboxsensor"

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

#define wifi_ssid "wifi_ssid"
#define wifi_password "wifi_password"
IPAddress ip(?, ?, ?, ?);
IPAddress dns(?, ?, ?, ?);
IPAddress gateway(?, ?, ?, ?);
IPAddress subnet(255, 255, 255, 0);
IPAddress mqtt_server(?, ?, ?, ?);
#define mqtt_user "mqtt_user" 
#define mqtt_password "mqtt_password"
#define mqtt_port 1883

WiFiClient espClient;
PubSubClient client(espClient);

int wificonnectcounter = 10;
int mqttconnectcounter = 10;

void setup() {
  
  Serial.begin(115200);
  
  WiFi.config(ip, dns, gateway, subnet);
  WiFi.mode(WIFI_STA);
  WiFi.begin(wifi_ssid, wifi_password);
  client.setServer(mqtt_server, mqtt_port);
  while (WiFi.status() != WL_CONNECTED and wificonnectcounter > 0) {
    wificonnectcounter = wificonnectcounter - 1;
    delay(250);
  }
  while (!client.connected() and mqttconnectcounter > 0) {
    mqttconnectcounter = mqttconnectcounter - 1;
    client.connect(SENSORNAME, mqtt_user, mqtt_password);
    delay(250);
  }

  client.publish("wemos/mailboxsensor/openlid", "true");

  delay(100);
  ESP.deepSleep(0);
}

void loop() {
  ESP.deepSleep(0);
}