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iothings:laboratoare:2025:lab3_code2 [2025/10/11 12:37] dan.tudose created |
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| - | <code C main.cpp> | ||
| - | #include <Arduino.h> | ||
| - | #include <WiFi.h> | ||
| - | #include <MQTT.h> // 256dpi MQTT library | ||
| - | #include <ArduinoJson.h> | ||
| - | #include <Adafruit_NeoPixel.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 NEOPIXEL_PIN 3 | ||
| - | Adafruit_NeoPixel pixel(1, NEOPIXEL_PIN, NEO_GRB + NEO_KHZ800); | ||
| - | |||
| - | WiFiClient net; | ||
| - | MQTTClient mqtt(1024); // 1KB message buffer | ||
| - | |||
| - | // ---------- Wi-Fi ---------- | ||
| - | 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(400); | ||
| - | Serial.print("."); | ||
| - | } | ||
| - | Serial.printf("\nIP: %s\n", WiFi.localIP().toString().c_str()); | ||
| - | } | ||
| - | |||
| - | // ---------- MQTT message handler (256dpi signature) ---------- | ||
| - | void onMessage(String &topic, String &payload) { | ||
| - | Serial.printf("MQTT msg on %s: %s\n", topic.c_str(), payload.c_str()); | ||
| - | |||
| - | // Create a dynamic document on the stack with a defined capacity | ||
| - | JsonDocument doc; | ||
| - | DeserializationError err = deserializeJson(doc, payload); | ||
| - | if (err) { | ||
| - | Serial.printf("JSON parse error: %s\n", err.c_str()); | ||
| - | return; | ||
| - | } | ||
| - | |||
| - | int r = doc["r"] | 0; | ||
| - | int g = doc["g"] | 0; | ||
| - | int b = doc["b"] | 0; | ||
| - | int brightness = doc["brightness"] | 50; | ||
| - | |||
| - | pixel.setPixelColor(0, pixel.Color(r, g, b)); | ||
| - | pixel.setBrightness(brightness); | ||
| - | pixel.show(); | ||
| - | |||
| - | // Acknowledge | ||
| - | String ackTopic = String(BASE_TOPIC) + "/led/ack"; | ||
| - | JsonDocument ack; // also replace StaticJsonDocument here | ||
| - | ack["ok"] = true; | ||
| - | ack["r"] = r; | ||
| - | ack["g"] = g; | ||
| - | ack["b"] = b; | ||
| - | ack["brightness"] = brightness; | ||
| - | |||
| - | char buf[96]; | ||
| - | size_t n = serializeJson(ack, buf, sizeof(buf)); | ||
| - | mqtt.publish(ackTopic, String(buf, n)); | ||
| - | } | ||
| - | |||
| - | |||
| - | // ---------- MQTT connect / subscribe ---------- | ||
| - | void ensureMQTT() { | ||
| - | if (mqtt.connected()) return; | ||
| - | |||
| - | String clientId = "sparrow-c6-led-" + String((uint32_t)ESP.getEfuseMac(), HEX); | ||
| - | |||
| - | Serial.println("MQTT connecting..."); | ||
| - | while (!mqtt.connect(clientId.c_str())) { | ||
| - | Serial.print("."); | ||
| - | delay(1000); | ||
| - | } | ||
| - | Serial.println("\nMQTT connected"); | ||
| - | |||
| - | String sub = String(BASE_TOPIC) + "/led"; | ||
| - | mqtt.subscribe(sub); | ||
| - | Serial.printf("Subscribed: %s\n", sub.c_str()); | ||
| - | } | ||
| - | |||
| - | void setup() { | ||
| - | Serial.begin(115200); | ||
| - | delay(200); | ||
| - | |||
| - | pixel.begin(); | ||
| - | pixel.clear(); | ||
| - | pixel.show(); | ||
| - | |||
| - | // Broker + transport setup and callback | ||
| - | mqtt.begin(MQTT_HOST, MQTT_PORT, net); | ||
| - | mqtt.onMessage(onMessage); | ||
| - | } | ||
| - | |||
| - | void loop() { | ||
| - | ensureWiFi(); | ||
| - | ensureMQTT(); | ||
| - | |||
| - | // Process incoming packets and keepalive | ||
| - | mqtt.loop(); | ||
| - | delay(10); | ||
| - | } | ||
| - | |||
| - | </code> | ||
