esp32-node/src/main.cpp

//Define DEBUG to get the Output from DEBUG_PRINTLN
#define DEBUG 1

#include <Arduino.h>

//Include Basecamp in this sketch
#include <Basecamp.hpp>
#include <Configuration.hpp>

#include <U8g2lib.h>
#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

#include <WiFiUdp.h>
#include <NTPClient.h>

#include "main.h"
#include "hardware.h"
#include "mp3.h"
#include "BME280.h"
#include "rotary.h"
#include "screen.h"

U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ 16, /* clock=*/ 15, /* data=*/ 4);

//Create a new Basecamp instance called iot
Basecamp iot;

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "de.pool.ntp.org", 3600, 60000);
char timeStr[20];
char weatherStr[32];

BME280 bme280;
MP3 mp3;
Rotary rotary;
Screen* screen;

menuType menuChange = eNone;
uint32_t lastButtonPress = 0;
uint32_t lastUpdate = 0;
uint32_t lastTransmit = 0;

//Variables for the mqtt packages and topics
uint16_t statusPacketIdSub = 0;
String commandTopic;
String bme280Topic;

void setup() {
  // gpio configuration
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(18, OUTPUT);
  digitalWrite(18, HIGH); // disable LoRa_CS

  //Initialize Basecamp
  iot.begin();

  u8g2.begin();
//  delay(50);
  screen = new WelcomeScreen();
  screen->draw();
  menuChange = eMainScreen;
  u8g2.setContrast(127);

  bme280.begin();
  bme280.printValues();

  //Configure the MQTT topics
  commandTopic = "esp32-node/cmd/" + iot.hostname + "/play";
  bme280Topic = "esp32-node/stat/" + iot.hostname + "/bme280";

  //Set up the Callbacks for the MQTT instance. Refer to the Async MQTT Client documentation
  // TODO: We should do this actually _before_ connecting the mqtt client...
  iot.mqtt.onConnect(onMqttConnect);
  //iot.mqtt.onPublish(NULL);
  iot.mqtt.onMessage(onMqttMessage);

  while (iot.wifi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
    screen->draw();
  }

  IPAddress localIP = iot.wifi.getIP();
  char ipStr[16];
  localIP.toString().toCharArray(ipStr, 16);

  timeClient.begin();
  timeClient.update();

  mp3.begin();

  rotary.registerCallback(rotation);
  rotary.begin(rotaryPinA, rotaryPinB, rotaryPinButton);
}


//This function is called when the MQTT-Server is connected
void onMqttConnect(bool sessionPresent) {
  DEBUG_PRINTLN(__func__);
  
  //Subscribe to the delay topic
  iot.mqtt.subscribe(commandTopic.c_str(), 0);
  //Trigger the transmission of the current state.
  transmitStatus();
  lastTransmit = millis();
}

void transmitStatus() {
  DEBUG_PRINTLN(__func__);
  StaticJsonBuffer<200> jsonBuffer;
  JsonObject& root = jsonBuffer.createObject();
  root["temperature"] = bme280.readTemperature();
  root["humidity"] = bme280.readHumidity();
  root["pressure"] = bme280.readPressure();

  char sensorBuf[root.measureLength()+1];
  root.printTo(sensorBuf, sizeof(sensorBuf));
  statusPacketIdSub = iot.mqtt.publish(bme280Topic.c_str(), 0, false, sensorBuf);
//  statusPacketIdSub = iot.mqtt.publish(bme280Topic.c_str(), 1, true, sensorBuf);
}


//This topic is called if an MQTT message is received
void onMqttMessage(char* topic, char* payload, AsyncMqttClientMessageProperties properties, size_t len, size_t index, size_t total) {
  DEBUG_PRINTLN(__func__);

  //Since we only subscribed to one topic, we only have to compare the payload
  if (strcmp(payload, "ON") == 0)  {
    mp3.start();
  } else if (strcmp(payload, "OFF") == 0) {
    mp3.stop();
  }
}

void suspend() {
  DEBUG_PRINTLN("Entering deep sleep");
  esp_sleep_enable_ext0_wakeup((gpio_num_t)sensorPin, 0);
  //properly disconnect from the MQTT broker
  iot.mqtt.disconnect();
  //send the ESP into deep sleep
  esp_deep_sleep_start();
}


void rotation(int i, int direction, int buttonPressed) {
  if(millis() - lastButtonPress >= 300) {
    lastButtonPress = millis();
    if (buttonPressed == 1) screen->select();
  }
  if (direction == 1) screen->next();
  else if (direction == -1) screen->previous();
}


void loop()
{
  if(millis() - lastUpdate >= 1000) {
    lastUpdate = millis();
    timeClient.update();
    timeClient.getFormattedTime().toCharArray(timeStr, 50);

    sprintf(weatherStr, "%.1f°C  %.1f%%  %.0fhPa", bme280.readTemperature(), bme280.readHumidity(), bme280.readPressure());
  }

  if(millis() - lastTransmit >= 60000) {
    lastTransmit = millis();
    transmitStatus();
  }

  if (menuChange != eNone) {
    delete screen;
    if (menuChange == eMainScreen) screen = new MainScreen();
    else if (menuChange == eMainMenu) screen = new MainMenu();
    else if (menuChange == eStationMenu) screen = new StationMenu();
    else screen = new MainScreen();
    menuChange = eNone;
  }

  screen->draw();

  delay(100);
}