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--- iothings:laboratoare:2025:lab3_code4 [2025/10/11 12:44]
dan.tudose created
+++ — (current)
@@ Line 1: / Line 1: @@
-<code C main.cpp>
-#include <Arduino.h>
-#include <WiFi.h>
-#include <WiFiClientSecure.h>
-#include <MQTT.h>
-#include <Wire.h>
-#include <Adafruit_BME680.h>
-#include <Adafruit_NeoPixel.h>
-#include <ArduinoJson.h>
-//////////////// EDIT THESE ////////////////
-const char* WIFI_SSID     = "YOUR_SSID";
-const char* WIFI_PASSWORD = "YOUR_PASSWORD";
-const char* MQTT_HOST     = "test.mosquitto.org";   // or your lab broker
-const uint16_t MQTT_PORT  = 1883;
-const char* BASE_TOPIC    = "iot/studentname";         // change per student
-////////////////////////////////////////////
-#define SDA_PIN 21
-#define SCL_PIN 22
-#define NEOPIXEL_PIN 3
-WiFiClient net;
-MQTTClient mqtt(2048);
-Adafruit_BME680 bme;
-Adafruit_NeoPixel pixel(1, NEOPIXEL_PIN, NEO_GRB + NEO_KHZ800);
-unsigned long nextConnTry = 0;
-uint32_t backoffMs = 1000;
-unsigned long lastHeartbeat = 0;
-unsigned long lastSensorPub = 0;
-void ensureWiFi() {
-  if (WiFi.status() == WL_CONNECTED) return;
-  WiFi.mode(WIFI_STA);
-  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
-  Serial.print("WiFi connecting");
-  while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); }
-  Serial.printf("\nWiFi OK, IP: %s, RSSI: %d dBm\n", WiFi.localIP().toString().c_str(), WiFi.RSSI());
-}
-void setLED(uint8_t r, uint8_t g, uint8_t b, uint8_t brightness) {
-  pixel.setBrightness(brightness);
-  pixel.setPixelColor(0, pixel.Color(r, g, b));
-  pixel.show();
-}
-void handleLEDJson(const String& payload) {
-  JsonDocument doc;
-  DeserializationError err = deserializeJson(doc, payload);
-  if (err) { Serial.printf("LED JSON parse error: %s\n", err.c_str()); return; }
-  uint8_t r = doc["r"].isNull() ? 0 : doc["r"].as<uint8_t>();
-  uint8_t g = doc["g"].isNull() ? 0 : doc["g"].as<uint8_t>();
-  uint8_t b = doc["b"].isNull() ? 0 : doc["b"].as<uint8_t>();
-  uint8_t br = doc["brightness"].isNull() ? 100 : doc["brightness"].as<uint8_t>();
-  setLED(r,g,b,br);
-  JsonDocument ack;
-  ack["ok"] = true; ack["r"] = r; ack["g"] = g; ack["b"] = b; ack["brightness"] = br;
-  String out; serializeJson(ack, out);
-  mqtt.publish((String(BASE_TOPIC)+"/led/ack").c_str(), out.c_str(), false, 1);
-}
-void messageReceived(String &topic, String &payload) {
-  Serial.printf("MSG [%s]: %s\n", topic.c_str(), payload.c_str());
-  if (topic == String(BASE_TOPIC) + "/led") handleLEDJson(payload);
-}
-bool connectMQTT() {
-  String cid = String("sparrow-c6-qos1-") + String((uint32_t)ESP.getEfuseMac(), HEX);
-  mqtt.setCleanSession(true);
-  mqtt.setKeepAlive(30);
-  String willTopic = String(BASE_TOPIC) + "/status";
-  mqtt.setWill(willTopic.c_str(), "{\"status\":\"offline\"}", true, 1);
-  Serial.printf("MQTT connecting to %s:%u as %s ...\n", MQTT_HOST, MQTT_PORT, cid.c_str());
-  bool ok = mqtt.connect(cid.c_str(), nullptr, nullptr);
-  if (!ok) { Serial.printf("MQTT connect failed, error=%d\n", mqtt.lastError()); return false; }
-  mqtt.subscribe((String(BASE_TOPIC)+"/led").c_str(), 1);
-  mqtt.publish(willTopic.c_str(), "{\"status\":\"online\"}", true, 1);
-  Serial.println("MQTT connected");
-  return true;
-}
-void ensureMQTT() {
-  if (mqtt.connected()) return;
-  if (millis() < nextConnTry) return;
-  if (!connectMQTT()) {
-    backoffMs = min<uint32_t>(backoffMs * 2, 30000);
-    nextConnTry = millis() + backoffMs;
-    Serial.printf("Retry in %lu ms\n", (unsigned long)backoffMs);
-  } else {
-    backoffMs = 1000;
-  }
-}
-bool readBME(float& tC, float& hPct, float& pHpa, float& gas) {
-  if (!bme.performReading()) return false;
-  tC = bme.temperature;
-  hPct = bme.humidity;
-  pHpa = bme.pressure / 100.0;
-  gas = bme.gas_resistance;
-  return true;
-}
-void setup() {
-  Serial.begin(115200);
-  pixel.begin();
-  setLED(0,0,0,10);
-  Wire.begin(SDA_PIN, SCL_PIN);
-  if (!bme.begin(0x76)) {
-    Serial.println("BME688/BME680 not found at 0x76!");
-  } else {
-    bme.setTemperatureOversampling(BME680_OS_8X);
-    bme.setHumidityOversampling(BME680_OS_2X);
-    bme.setPressureOversampling(BME680_OS_4X);
-    bme.setIIRFilterSize(BME680_FILTER_SIZE_3);
-    bme.setGasHeater(0, 0);
-  }
-  mqtt.begin(MQTT_HOST, MQTT_PORT, net);
-  mqtt.onMessage(messageReceived);
-}
-void loop() {
-  ensureWiFi();
-  ensureMQTT();
-  mqtt.loop();
-  if (mqtt.connected() && millis() - lastHeartbeat > 15000) {
-    lastHeartbeat = millis();
-    JsonDocument hb;
-    hb["uptime_s"] = (uint32_t)(millis()/1000);
-    hb["ip"] = WiFi.localIP().toString();
-    hb["rssi"] = WiFi.RSSI();
-    String out; serializeJson(hb, out);
-    mqtt.publish((String(BASE_TOPIC)+"/heartbeat").c_str(), out.c_str(), true, 1);
-    Serial.printf("Heartbeat -> %s\n", out.c_str());
-  }
-  if (mqtt.connected() && millis() - lastSensorPub > 10000) {
-    lastSensorPub = millis();
-    float tC, hPct, pHpa, gas;
-    if (readBME(tC, hPct, pHpa, gas)) {
-      JsonDocument s;
-      s["ts"] = (uint32_t)(millis()/1000);
-      s["temp_c"] = tC;
-      s["hum_pct"] = hPct;
-      s["press_hpa"] = pHpa;
-      s["gas_ohm"] = gas;
-      String out; serializeJson(s, out);
-      mqtt.publish((String(BASE_TOPIC)+"/bme688").c_str(), out.c_str(), false, 1);
-      Serial.printf("Sensor -> %s\n", out.c_str());
-    } else {
-      Serial.println("BME read failed");
-    }
-  }
-}
-</code>