Initial, very basic version of Kitchen PIR

src/main.cpp

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+#include <Arduino.h>
+#include <WiFi.h>
+#include <PubSubClient.h>
+#include <ArduinoJson.h>
+
+const int PIR_PIN=23;
+const char* ssid = "JoNelsDarlings";
+const char* password = "Paris2016";
+const char* mqtt_server = "mqtt.ddns.kawomi.com";
+
+
+WiFiClient espClient;
+PubSubClient mqttClient(espClient);
+unsigned long lastMsg = 0;
+#define MSG_BUFFER_SIZE	(50)
+char msg[MSG_BUFFER_SIZE];
+
+void setup_wifi() {
+
+  delay(10);
+  // We start by connecting to a WiFi network
+  Serial.println();
+  Serial.print("Connecting to ");
+  Serial.println(ssid);
+
+  WiFi.mode(WIFI_STA);
+  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 reconnect() {
+  // Loop until we're reconnected
+  while (!mqttClient.connected()) {
+    Serial.print("Attempting MQTT connection...");
+    // Create a random client ID
+    String clientId = "ESP32Client-";
+    clientId += String(random(0xffff), HEX);
+    // Attempt to connect
+    if (mqttClient.connect(clientId.c_str())) {
+      Serial.println("MQTT connected");
+      // Once connected, publish an announcement...
+    } else {
+      Serial.print("MQTT failed, rc=");
+      Serial.print(mqttClient.state());
+      Serial.println(" try again in 5 seconds");
+      // Wait 5 seconds before retrying
+      delay(5000);
+    }
+  }
+}
+
+void send_mqtt(String value) {
+  const size_t CAPACITY = JSON_OBJECT_SIZE(1);
+  StaticJsonDocument<CAPACITY> doc;
+
+  // create an object
+  JsonObject object = doc.to<JsonObject>();
+  object["status"] = value.c_str();
+
+  // serialize the object and send the result to Serial
+  static char sensorStatus[150];
+  serializeJson(doc, sensorStatus);
+  Serial.println(sensorStatus);
+
+  mqttClient.publish("Address/Livorno/Kitchen/PIR", sensorStatus, true);
+}
+
+
+void setup() {
+  pinMode(LED_BUILTIN,OUTPUT);
+  pinMode(PIR_PIN,INPUT);
+
+  Serial.begin(115200);
+  setup_wifi();
+  mqttClient.setServer(mqtt_server, 1883);
+
+}
+
+void loop() {
+  if (!mqttClient.connected()) {
+    reconnect();
+  }
+  mqttClient.loop();
+
+  int pir = digitalRead(PIR_PIN);
+  if (pir == HIGH) {
+    send_mqtt("motion");
+    digitalWrite(LED_BUILTIN,HIGH);
+    delay(1000);
+    digitalWrite(LED_BUILTIN,LOW);
+  }
+}