listeningdaemon/arduino/MQTT/MQTT.ino

#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <NTPClient.h>
#include <WiFiUdp.h>
#include "certificate.h"
#include "secret.h"
#define CERT mqtt_broker_cert
#define MSG_BUFFER_SIZE (50)

const char* ssid = VITRINE_SSID;
const char* password = VITRINE_WIFI_PASS;
const char* mqtt_server = "mqtt.klank.school";  // eg. your-demo.cedalo.cloud or 192.168.1.11
const uint16_t mqtt_server_port = 7000;         // or 8883 most common for tls transport
const char* mqttUser = MQTT_ARDUINO_USERNAME;
const char* mqttPassword = MQTT_ARDUINO_PASS;

#define MAIN_CHANNEL "main/#"

WiFiClient wifiClient;
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP);
PubSubClient mqttClient(wifiClient);

#if hasRelayShield
const int RELAY_PIN_FAN1 = 1;
const int RELAY_PIN_FAN2 = 2;
const int RELAY_PIN_RADIO1 = 3;
const int RELAY_PIN_LAMP1 = 4;
const int RELAY_PIN_LAMP2 = 5;
// const int RELAY_PIN = 6;
// const int RELAY_PIN = 7;
// const int RELAY_PIN = 8;
#endif

#if hasMotorshield
#include <Adafruit_MotorShield.h>
Adafruit_MotorShield AFMS = Adafruit_MotorShield();
Adafruit_DCMotor* motor1 = AFMS.getMotor(1);
Adafruit_DCMotor* motor2 = AFMS.getMotor(2);
Adafruit_DCMotor* motor3 = AFMS.getMotor(3);
Adafruit_DCMotor* motor4 = AFMS.getMotor(4);

void movePrinter(String topic, int payload) {

  if (topic.indexOf("speed") > 0) {
    if (topic.indexOf("printer/one") > 0) {
      motor1->setSpeed(payload);
    } else if (topic.indexOf("printer/two") > 0) {
      motor2->setSpeed(payload);
    } else if (topic.indexOf("printer/three") > 0) {
      motor3->setSpeed(payload);
    } else if (topic.indexOf("printer/four") > 0) {
      motor4->setSpeed(payload);
    }
  } else {
    if (payload == 0) {
      payload = 4;
    }

    if (topic.indexOf("printer/one") > 0) {
      motor1->run(payload);
    } else if (topic.indexOf("printer/two") > 0) {
      motor2->run(payload);
    } else if (topic.indexOf("printer/three") > 0) {
      motor3->run(payload);
    } else if (topic.indexOf("printer/four") > 0) {
      motor4->run(payload);
    }
  }
}
#endif

#if hasRelayShield
void togglePower(int pin, int payload) {
  bool state = false;
  if (payload > 1) {
    state = true;
  }

  digitalWrite(pin, state);
  delay(500);
}
#endif

void callback(char* topic, uint8_t* payload, unsigned int length) {
  String t(topic);
  Serial.println();
  Serial.print("Message arrived on topic: '");
  Serial.print(topic);
  Serial.print("' with payload: ");
  String message = "";

  for (unsigned int i = 0; i < length; i++) {
    message += (char)payload[i];
  }
  Serial.println(message);

#if hasMotorshield
  if (t.indexOf("/printer/") > 0) {
    movePrinter(t, message.toInt());
  }
#endif

#if hasRelayShield
  if (t.indexOf("/fan/one") > 0) {
    togglePower(RELAY_PIN_FAN1, message.toInt());
  } else if (t.indexOf("/fan/two") > 0) {
    togglePower(RELAY_PIN_FAN2, message.toInt());
  } else if (t.indexOf("/radio/one") > 0) {
    togglePower(RELAY_PIN_RADIO1, message.toInt());
  } else if (t.indexOf("/lamp/one") > 0) {
    togglePower(RELAY_PIN_LAMP1, message.toInt());
  } else if (t.indexOf("/lamp/two") > 0) {
    togglePower(RELAY_PIN_LAMP2, message.toInt());
  }
#endif
}


void connect() {
  while (!mqttClient.connected()) {

    Serial.print("Attempting MQTT connection...");
    String clientId = arduinoName;

    clientId += String(random(0xffff), HEX);
    if (mqttClient.connect(clientId.c_str(), mqttUser, mqttPassword)) {
      Serial.println("connected");
      mqttClient.subscribe(MAIN_CHANNEL);
      mqttClient.publish("main/hello", ("A wild arduino appeared"));
    } else {
      Serial.print("failed, rc=");
      Serial.print(mqttClient.state());
      Serial.println(" will try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  Serial.println("run setup");
  Serial.print("Connecting to ");
  Serial.println(ssid);

#if hasRelayShield
  pinMode(RELAY_PIN_FAN1, OUTPUT);
  pinMode(RELAY_PIN_FAN2, OUTPUT);
  pinMode(RELAY_PIN_RADIO1, OUTPUT);
  pinMode(RELAY_PIN_LAMP1, OUTPUT);
  pinMode(RELAY_PIN_LAMP2, OUTPUT);
#endif

#if hasMotorshield
  Serial.println("i have a motorshield");
  if (!AFMS.begin()) {
    Serial.println("Could not find Motor Shield. Check wiring.");
    while (1)
      ;
  };

  motor1->setSpeed(160);
  motor1->run(RELEASE);
  motor2->setSpeed(160);
  motor2->run(RELEASE);
  motor3->setSpeed(160);
  motor3->run(RELEASE);
  motor4->setSpeed(160);
  motor4->run(RELEASE);
#endif

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(50);
    Serial.print(".");
  }
  Serial.println("----");
  Serial.println("WiFi connected");
  Serial.println("----");

  timeClient.begin();
  Serial.println("finish setup_wifi");
  mqttClient.setServer(mqtt_server, mqtt_server_port);
  mqttClient.setCallback(callback);
}

void loop() {
  if (!mqttClient.connected()) {
    connect();
  }

  mqttClient.loop();
  timeClient.update();
}