WiFiThermostat/src/WiFiThermostat.ino

//#include <Arduino.h>

// ESP8266 core libs
#include <ESP8266HTTPUpdateServer.h>
#include <ESP8266WebServer.h>
#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
//#include <WiFiClient.h>

// WiFiManager
#include <PersWiFiManagerExt.h>

// DNS server used for captive portal in WiFiManager
#include <DNSServer.h>

// MQTT client
#include <PubSubClient.h>

// SPIFFS FS support - used for config storage
#include <FS.h>

// Json lib - used for config storage and web api
#include <ArduinoJson.h>
//#include <string.h>

// I2C and LCD display
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// DHT22 sensor lib
#include <DHT.h>

// Button handling
#include <Bounce2.h>
#include <Button.h>
#include <ButtonEventCallback.h>
#include <PushButton.h>

// PRE-COMPILE CONFIGURATION

//#define FORCE_SPIFFS_FORMAT

//#define DEBUG_VERBOSE
//#define DEBUGMODE // WARNING - DEBUGMODE reveals saved passwords on serial connection and shows note in web interface

//#define DEBUG_SERIAL true
#define DEBUG_MQTT true

// ENABLE FEATURES
#define ENABLE_FEATURE_NTP_TIME
#define ENABLE_FEATURE_WEB_CONSOLE_WEBSOCKETS
#define ENABLE_FEATURE_WEB_CONSOLE_BUFFERED
#define ENABLE_FEATURE_PW_ENCRYPTION
#define ENABLE_FEATURE_HTTP_UPDATER

#ifdef ENABLE_FEATURE_NTP_TIME
#include <time.h>
#endif

//#ifdef ENABLE_FEATURE_WEB_CONSOLE_WEBSOCKETS
#include <WebSocketsServer.h>
//#endif

// DEFINE NAMES
#define FIRMWARE_NAME "WiFiThermostat"
#define FIRMWARE_VERSION "0.6.1"
#define FIRMWARE_URL "https://git.flokra.at/flo/WiFiThermostat"
#define FIRMWARE_COPYRIGHT "FloKra"
#define FIRMWARE_COPYRIGHT_URL "https://www.flokra.at/"
#define FIRMWARE_SHORTNAME "WTherm"

// ENCRYPTION KEY used for passwords - up to 100 chars
#define PW_ENCRYPTION_KEY "PLhg2i7fPoYSoipq1hTF1KOqyzp3OPWtUzufCDWmD9KgxbaKYOG5WbxoO4QoLDj3F6Iif4R55UbHX1nRo7GKNqT6QXQCTsdFvFem"

// default values, can later be overridden via configuration
#define MAX_MEASUREMENT_AGE 30000      // in ms, for measured inside Temp/Hum
#define MAX_MEASUREMENT_AGE_OUT 300000 // in ms, for received outside Temp/Hum

// NTP defaults
#ifdef ENABLE_FEATURE_NTP_TIME
#define DEFAULT_NTP_ENABLED true
#define DEFAULT_NTP_SERVER "pool.ntp.org"
#define DEFAULT_NTP_SYNC_INTERVAL 7200
#define DEFAULT_TIMEZONE "CET-1CEST,M3.5.0/02,M10.5.0/03"
#endif

// confDevWiFi
//#define DEVICE_NAME "WTherm-1" // now created from FIRMWARE_SHORTNAME + last 2 octets of MAC address
//#define DEFAULT_HOST_NAME "" // now created from FIRMWARE_SHORTNAME + last 2 octets of MAC address
#define DEFAULT_WIFI_APMODE_PASSWORD "nichtsicher" // min 8 chars!
#define DEFAULT_WIFI_APMODE_TIMEOUT 5      //min
#define DEFAULT_WIFI_RETRY_INTERVAL 5      //min
#define DEFAULT_WIFI_CONNCHECK_INTERVAL 20 //s
#define DEFAULT_WIFI_REBOOT_ONNOCONNECT 60 //min

// confWeb
#define HTTP_SET_TOKEN ""
#define DEFAULT_HTTP_USER ""
#define DEFAULT_HTTP_PASS ""
#define DEFAULT_HTTP_USER_AUTH false
#define DEFAULT_ENABLE_WEBCONSOLE true

// confMqtt
#define MQTT_ENABLE false
#define MQTT_SERVER ""
#define MQTT_PORT 1883
#define MQTT_USER ""
#define MQTT_PASS ""
#define MQTT_TOPIC_IN "Test/WTherm"
#define MQTT_TOPIC_OUT "Test/WTherm/stat"
#define MQTT_OUT_RETAIN false
#define MQTT_OUT_RETAIN_SENSORS false
#define MQTT_OUT_PUBLISH_INTERVAL 0         // min, 0=only on change
#define MQTT_OUT_PUBLISH_INTERVAL_SENSORS 5 // min, 0=only on change
#define MQTT_WILLTOPIC "Test/WTherm/availability"
#define MQTT_WILLQOS 2
#define MQTT_WILLRETAIN false
#define MQTT_WILLMSG "offline"
#define MQTT_CONNMSG "online"
#define MQTT_ENABLE_HEARTBEAT true

// max interval for MQTT heartbeat message. only applicable if MQTT
// IN-topic is defined. after this timeout MQTT reconnect is forced
#define MQTT_HEARTBEAT_MAXAGE 180000

// max interval for MQTT heartbeat message. only applicable if MQTT
// IN-topic is defined. after this timeout the ESP will reboot
#define MQTT_HEARTBEAT_MAXAGE_REBOOT 1800000

// confBas
#define DEFAULT_SETTEMP_MIN 16.0 // minimal temperature that can be set
#define DEFAULT_SETTEMP_MAX 26.0 // maximal temperature that can be set
#define AUTOSAVE_SETTEMP true
#define AUTOSAVE_SETMODE false
#define SAVE_TO_MQTT_RETAINED false
#define DEFAULT_MEASURE_INTERVAL 15 // interval for temp/hum measurement

// interval for display updates (if out-temp is active, display will toggle
// in this interval)
#define DEFAULT_DISPLAY_INTERVAL 5
#define DEFAULT_DISPLAY_TIMEOUT 30 // display timeout after keypress (illumination)
#define DEFAULT_PIR_ENABLES_DISPLAY false
#define DEFAULT_PIR_ENABLES_DISPLAY_PRESET0_ONLY true
#define DEFAULT_TOGGLING_I_O_TEMPHUM false

// confAdv
#define DEFAULT_HYSTERESIS 0.15         // hysteresis, normally 0.1 - 0.3
#define DEFAULT_HEATING_MIN_OFFTIME 300 // minimal time the heating must keep turned off until it can start again, in s

// correction value for temperature sensor reading
#define TEMPSENSOR_CORRECTION_VALUE 0.0
#define HUMSENSOR_CORRECTION_VALUE 0 // correction value for humidity sensor reading

// decreases the set temp to overcome further temperature rise when the
// heating is already switched off
#define SETTEMP_DECREASE_VALUE 0.0
#define OFF_MESSAGE "HEATING OFF"
#define INSIDE_TEMP_LABEL "I"
#define OUTSIDE_TEMP_LABEL "O"
#define MODE_NAME_0 "off"
#define MODE_NAME_1 "heat"
#define PRESET_NAME_0 "Normal"
#define PRESET_NAME_1 "Reduction 1"
#define PRESET_NAME_2 "Reduction 2"

// confAdd
#define OUTTEMP_TOPIC_IN ""
#define OUTHUM_TOPIC_IN ""
#define MQTT_TOPIC_PIR "" // extra publish topic for PIR sensor
#define MQTT_TOPIC_PIR_ON "ON"
#define MQTT_TOPIC_PIR_OFF "OFF"

// confLog
#define DEFAULT_LOGLEVEL_SERIAL LOGLEVEL_DEBUG
#define DEFAULT_LOGLEVEL_WEB LOGLEVEL_INFO
#define DEFAULT_LOGLEVEL_MQTT LOGLEVEL_INFO
#define DEFAULT_LOGLEVEL_SYSLOG LOGLEVEL_DEBUG // SYSLOG not implemented yet
#define LOG_WEB_REQUESTS false

// other (not configurable via commands/WebIF)
#define DEFAULT_SETTEMP_HEATOFF 5.0 // heating target temperature in OFF mode (freezing guard, therefore > 0)
#define SETTEMP_LOW_MIN 14.0        // minimal configurable temperature for reduction mode
#define SETTEMP_LOW_MAX 21.5        // maximal configurable temperature for reduction mode

// default initial values
#define DEFAULT_SETTEMP 21.5
#define DEFAULT_HEATINGMODE 1
#define DEFAULT_PRESET 1
#define DEFAULT_SETTEMP_LOW 20.0  // set temperature in night/low mode
#define DEFAULT_SETTEMP_LOW2 17.0 // set temperature in night/low mode

// COMPILE TIME SETTINGS
// default values that can only be configured at compile time / hardware configuration
#define BUTTON_DEBOUNCE_TIME 120
#define BUTTON_HOLD_TIME 750

// pin assignments and I2C addresses
#define PIN_DHTSENSOR 13
#define PIN_RELAIS 15 // 16
#define PIN_BUTTON_PLUS 2
#define PIN_BUTTON_MINUS 0
#define PIN_BUTTON_MODE 14
#define PIN_PIRSENSOR 12
#define DHTTYPE DHT22 // DHT sensor type
#define LCDADDR 0x27  // I2C address LCD
#define LCDCOLS 16    // LCD cols
#define LCDLINES 2    // LCD lines

// default logic levels
#define RELAISONSTATE HIGH
#define BUTTONONSTATE LOW

// SPIFFS settings
#define SPIFFS_DBG
#define SPIFFS_USE_MAGIC

// LOG LEVELS
#define LOGLEVEL_OFF 0
#define LOGLEVEL_ERROR 1
#define LOGLEVEL_WARN 2
#define LOGLEVEL_INFO 3
#define LOGLEVEL_DEBUG 4
#define LOGLEVEL_VERBOSE 5

// END PRE-COMPILE CONFIGURATION

PROGMEM const char PGMStr_FIRMWARE_NAME[] = FIRMWARE_NAME;
PROGMEM const char PGMStr_FIRMWARE_VERSION[] = FIRMWARE_VERSION;
PROGMEM const char PGMStr_FIRMWARE_URL[] = FIRMWARE_URL;
PROGMEM const char PGMStr_FIRMWARE_COPYRIGHT[] = FIRMWARE_COPYRIGHT;
PROGMEM const char PGMStr_FIRMWARE_COPYRIGHT_URL[] = FIRMWARE_COPYRIGHT_URL;
PROGMEM const char PGMStr_FIRMWARE_SHORTNAME[] = FIRMWARE_SHORTNAME;

PROGMEM const char PGMStr_changedTo[] = "changed to";
PROGMEM const char PGMStr_preset[] = "preset";
PROGMEM const char PGMStr_heatingMode[] = "heatingMode";
PROGMEM const char PGMStr_setTemp[] = "setTemp";
PROGMEM const char PGMStr_currentSetTemp[] = "currSetTemp";
PROGMEM const char PGMStr_setTempLow[] = "setTempLow";
PROGMEM const char PGMStr_setTempLow2[] = "setTempLow2";
PROGMEM const char PGMStr_switchHeating[] = "switch heating";
PROGMEM const char PGMStr_mqttRetainedSave[] = "MQTT retained save";
PROGMEM const char PGMStr_heating[] = "heating";
PROGMEM const char PGMStr_thermostat[] = "TSTAT";
PROGMEM const char PGMStr_WiFi[] = "WiFi";
//PROGMEM const char PGMStr_connectedTo[] = "connected to";
//PROGMEM const char PGMStr_withIP[] = "with IP";
PROGMEM const char PGMStr_MQTT[] = "MQTT";
PROGMEM const char PGMStr_connectedReconnects[] = "connected, reconnects";
PROGMEM const char PGMStr_connectedFailed[] = "connect FAILED";

PROGMEM const char compile_date[] = __DATE__ " " __TIME__;

const char PGMStr_confDevWiFi[] PROGMEM = "confDevWiFi";
const char PGMStr_confWeb[] PROGMEM = "confWeb";
const char PGMStr_confMqtt[] PROGMEM = "confMqtt";
const char PGMStr_confBas[] PROGMEM = "confBas";
const char PGMStr_confAdv[] PROGMEM = "confAdv";
const char PGMStr_confAdd[] PROGMEM = "confAdd";
const char PGMStr_confTime[] PROGMEM = "confTime";
const char PGMStr_confLog[] PROGMEM = "confLog";

//const char PGMStr_delimiter[] PROGMEM = "--------";
const char PGMStr_MQTTState_DIS[] PROGMEM = "DISABLED";
const char PGMStr_MQTTState_M4[] PROGMEM = "CONNECTION_TIMEOUT";
const char PGMStr_MQTTState_M3[] PROGMEM = "CONNECTION_LOST";
const char PGMStr_MQTTState_M2[] PROGMEM = "CONNECT_FAILED";
const char PGMStr_MQTTState_M1[] PROGMEM = "DISCONNECTED";
const char PGMStr_MQTTState_0[] PROGMEM = "CONNECTED";
const char PGMStr_MQTTState_1[] PROGMEM = "CONNECT_BAD_PROTOCOL";
const char PGMStr_MQTTState_2[] PROGMEM = "CONNECT_BAD_CLIENT_ID";
const char PGMStr_MQTTState_3[] PROGMEM = "CONNECT_UNAVAILABLE";
const char PGMStr_MQTTState_4[] PROGMEM = "CONNECT_BAD_CREDENTIALS";
const char PGMStr_MQTTState_5[] PROGMEM = "CONNECT_UNAUTHORIZED";
const char *const PGMStr_MQTTStates[] PROGMEM =
    {
        PGMStr_MQTTState_M4,
        PGMStr_MQTTState_M3,
        PGMStr_MQTTState_M2,
        PGMStr_MQTTState_M1,
        PGMStr_MQTTState_0,
        PGMStr_MQTTState_1,
        PGMStr_MQTTState_2,
        PGMStr_MQTTState_3,
        PGMStr_MQTTState_4,
        PGMStr_MQTTState_5,
};
char mqttCurrentStateName[25];

//---------------------------------------------------------------------------------------------------------------------------------------------

PushButton buttonPlus = PushButton(PIN_BUTTON_PLUS, ENABLE_INTERNAL_PULLUP);
PushButton buttonMinus = PushButton(PIN_BUTTON_MINUS, ENABLE_INTERNAL_PULLUP);
PushButton buttonMode = PushButton(PIN_BUTTON_MODE, ENABLE_INTERNAL_PULLUP);
PushButton pirSensor = PushButton(PIN_PIRSENSOR, PRESSED_WHEN_HIGH);

bool WifiInApMode = false;
unsigned long WifiApModeStartedAt;

#ifdef ENABLE_FEATURE_PW_ENCRYPTION
char encKey[] = PW_ENCRYPTION_KEY;
#endif
bool confEncryptionEnabled = false;

#ifdef ENABLE_FEATURE_NTP_TIME
struct tm lt; // http://www.cplusplus.com/reference/ctime/tm/
//const char *const PROGMEM dayNames[] = {"Sonntag", "Montag", "Dienstag", "Mittwoch", "Donnerstag", "Freitag", "Samstag"};
//const char *const PROGMEM dayShortNames[] = {"So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"};
//const char *const PROGMEM monthNames[] = {"Januar", "Februar", "März", "April", "Mai", "Juni", "Juli", "August", "September", "Oktober", "November", "Dezember"};
//const char *const PROGMEM monthShortNames[] = {"Jan", "Feb", "Mrz", "Apr", "Mai", "Jun", "Jul", "Aug", "Sep", "Okt", "Nov", "Dez"};
#endif

// config variables - do not change here!

// confDevWiFi
struct confDataDevWiFi
{
  char deviceName[33]; // device name - for web interface and AP-Mode SSID
  char hostName[33];   // announced hostname on WiFi connection
  char WiFiSSID1[33];
  char WiFiPW1[64];
  char WiFiSSID2[33];
  char WiFiPW2[64];
  char WiFiAPModeSSID[33]; // generated, not set via config
  char WiFiAPModePassword[64];
  uint16_t WiFiAPModeTimeout;
  uint16_t WiFiRetryInterval;
  uint16_t WiFiConnCheckInterval;
  uint16_t WiFiRebootOnNoConnect;
} confDevWiFi;

// confWeb
struct confDataWeb
{
  char http_token[31];
  char http_user[31];
  char http_pass[31];
  bool http_user_auth;
  char http_user1[31];
  char http_pass1[31];
  char http_user2[31];
  char http_pass2[31];
  bool wConsole;
  bool wsConsole;
} confWeb;

// confMqtt
struct confDataMqtt
{
  bool mqtt_enable;
  char mqtt_server[41];
  uint16_t mqtt_port;
  char mqtt_user[31];
  char mqtt_pass[31];
  char mqtt_topic_in[51];  // MQTT in topic for commands
  char mqtt_topic_out[51]; // MQTT out base topic, will be extended by various value names
  char mqtt_willTopic[51]; // MQTT Last Will topic
  uint8_t mqtt_willQos;    // MQTT Last Will topic QOS
  bool mqtt_willRetain;    // MQTT Last Will retain
  char mqtt_willMsg[31];   // MQTT Last Will payload
  char mqtt_connMsg[31];
  bool mqtt_outRetain;         // send MQTT out with retain flag
  bool mqtt_outRetain_sensors; // send MQTT out with retain flag
  uint8_t mqtt_outPubInterval;
  uint8_t mqtt_outPubInterval_sensors;
  bool mqtt_enable_heartbeat;
  unsigned long mqtt_heartbeat_maxage_reconnect;
  unsigned long mqtt_heartbeat_maxage_reboot;
} confMqtt;

// confBas
struct confDataBas
{
  float setTempMin; // minimal temperature that can be set
  float setTempMax; // maximal temperature that can be set
  bool autoSaveSetTemp;
  bool autoSaveHeatingMode;
  bool saveToMqttRetained;
  uint16_t measureInterval; // interval for temp/hum measurement
  uint16_t displayInterval; // interval for display updates (if out-temp is
                            // active, display will toggle in this interval)
  uint16_t displayTimeout;  // display timeout after keypress (illumination)
  bool PIR_enablesDisplay;  // PIR sensor enables display illumination
  bool PIR_enablesDisplay_preset0only;
  bool togglingTempHumAIDisplay;
} confBas;

// confAdv
struct confDataAdv
{
  float hysteresis;           // hysteresis, normally 0.1 - 0.5
  uint16_t heatingMinOffTime; // minimal time the heating keeps turned off in
                              // s
  float tempCorrVal;          // correction value for
                              // temperature sensor reading
  int humCorrVal;             // correction value for humidity sensor reading
  float setTempDecreaseVal;   // decreases the set temp to overcome further
                              // temperature rise when the heating is already
                              // switched off
  char offMessage[15];
  char iTempLabel[2];
  char oTempLabel[2];
  char modeName0[15];
  char modeName1[15];
  char psetName0[15];
  char psetName1[15];
  char psetName2[15];
} confAdv;

// confAdd
struct confDataAdd
{
  char mqtt_topic_pir[51];
  char mqtt_payload_pir_on[10];
  char mqtt_payload_pir_off[10];
  char outTemp_topic_in[51];
  char outHum_topic_in[51];
} confAdd;

// confTime
struct confDataTime
{
  bool ntpEnable;
  char timeZoneStr[50];
  char ntpServer1[31];
  char ntpServer2[31];
  unsigned long ntpSyncInterval;
} confTime;

// confLog
struct confDataLog
{
  uint8_t logLevelSerial;
  uint8_t logLevelWeb;
  uint8_t logLevelMqtt;
  uint8_t logLevelSyslog;
  bool logWebRequests;
} confLog;

// Uptime
struct sysUptimeStruct
{
  unsigned int day = 0;
  unsigned int hour = 0;
  unsigned int min = 0;
  unsigned int sec = 0;
  unsigned int highMillis = 0;
  unsigned int rollover = 0;
  char uptimeStr[16];
} sysUptime;

bool mqtt_tempDisabled_credentialError = false;

char mqtt_topic_in_cmd[61];
char mqtt_topic_in_setTemp[61];
char mqtt_topic_in_setMode[61];
char mqtt_topic_in_setPreset[61];

// set values
float setTemp = DEFAULT_SETTEMP;
float setTempLow = DEFAULT_SETTEMP_LOW;   // set temperature in night/low mode
float setTempLow2 = DEFAULT_SETTEMP_LOW2; // set temperature in night/low mode
float currSetTemp = DEFAULT_SETTEMP;
uint8_t heatingMode = DEFAULT_HEATINGMODE; // 0 = off, 1 = heat
uint8_t preset = DEFAULT_PRESET;           // 0 = normal/day, 1 = night/reduction 1, 2 =
                                           // reduction 2 (long term leave)

// saved set values (same as above, held in memory additionally to prevent
// saving unchanged values)
float setTempSaved;
float setTempLowSaved;
float setTempLow2Saved;
uint8_t heatingModeSaved;
uint8_t presetSaved;

// global pre set conf variables - not changeable via configuration
float setTempLowMin = SETTEMP_LOW_MIN;
float setTempLowMax = SETTEMP_LOW_MAX;
uint16_t debounceTime = BUTTON_DEBOUNCE_TIME;
uint16_t buttonHoldTime = BUTTON_HOLD_TIME;
unsigned long maxMeasurementAge = MAX_MEASUREMENT_AGE;
unsigned long maxMeasurementAgeOut = MAX_MEASUREMENT_AGE_OUT;

// global variables for program flow
float currTemp;                     // last reading from DHT sensor with smoothing
float currTemp_raw;                 // last reading from DHT sensor (raw)
uint16_t currHum;                   // last reading from DHT sensor with smoothing
uint16_t currHum_raw;               // last reading from DHT sensor (raw)
bool turnHeatingOn = false;         // true if heating is active (relais switched on)
unsigned long heatingLastOnMillis;  // last time heating was switched on
unsigned long heatingLastOffMillis; // last time heating was switched off
float outTemp;                      // outside temp (via MQTT if enabled and in-topic configured)
uint16_t outHum;                    // outside temp (via MQTT if enabled and in-topic configured)
unsigned long outTempHumLastUpdate; // last reading from out temp/hum source
char outTemp_newValue[6];
bool outTemp_parseNewValue;
char outHum_newValue[4];
bool outHum_parseNewValue;
char currentModeName[15];
char currentPresetName[15];
uint16_t displayInterval;
uint8_t whichTempToDisplay;          // 1=temp inside (from DHT sensor), 2= temp outside
                                     // (via MQTT) - if out temp/hum available this value
                                     // and the displayed value pair toggles with every
                                     // displayInterval
unsigned long lastMeasure = 0;       // millis of last temp/hum measurement
unsigned long lastDisplayUpdate = 0; // millis of last display update
unsigned long lastDisplayToggle = 0; // millis of last display toggle
unsigned long lastTempUpdate = 0;    // last update time of DHT reading
//char msg[101];                       // buffer MQTT in payload
//char topic[70];                      // buffer MQTT in topic
bool displayActive = false; // gets true when button is pressed. display light
                            // gets switched on until timeout. button actions
                            // are only performed while display is active
bool PIRSensorOn = false;
unsigned long heatingOnTime, heatingOffTime;
bool config_was_changed = false;

unsigned long lastUpdate_setTemp = 0;     // set to millis() every time setTemp value is changed
unsigned long lastUpdate_setTempLow = 0;  // set to millis() every time setTemp value is changed
unsigned long lastUpdate_setTempLow2 = 0; // set to millis() every time setTemp value is changed
unsigned long lastUpdate_heatingMode = 0; // set to millis() every time heatingMode value is changed
unsigned long lastUpdate_preset = 0;      // set to millis() every time preset value is changed

char cmdPayload[101];    // buffer for commands
bool cmdInQueue = false; // command is queued and will be processed next loop() run

// not used any more, now triggered directly
//bool saveConfigToFlash = false;  // conf is saved in next loop() run
//bool saveConfig2ToFlash = false; // conf2 is saved in next loop() run
// ----

uint16_t saveValuesTimeout = 5000;
unsigned long lastValueChange;       // is set to millis() whenever setTemp value
                                     // and/or heatingMode value is changed. used for
                                     // autoSave function with hardcoded 5s timeout
bool setTempAlreadySaved = true;     // only save if not yet done
bool setTempLowAlreadySaved = true;  // only save if not yet done
bool setTempLow2AlreadySaved = true; // only save if not yet done
bool heatingModeAlreadySaved = true; // only save if not yet done
bool presetAlreadySaved = true;      // only save if not yet done

unsigned long lastRun = 0;
uint16_t count100ms = 0;
uint16_t countSeconds = 0;
uint16_t countMeasureInterval = 0;
uint16_t countDisplayInterval = 0;
uint16_t displayOverlayMsgTimeout = 2;

unsigned long mqttLastReconnectAttempt = 0;
uint16_t mqttReconnectAttempts = 0;
uint16_t mqttReconnects = 0;
bool mqttConnected = false;
unsigned long mqttLastHeartbeat;
bool mqttInTopicSubscribed = false;

bool pendingRestart = false;
bool doRestart = false;
unsigned long pendingRestart_lastMillis = 0;

bool displayShowFullscreenMsg = false;
// unsigned long displayShowFullscreenMsg_lastMillis = 0;

bool pendingPresetToggle = false;
bool updateDisplayImmediately = false;
uint8_t pendingPreset;
char pendingPresetName[15];

bool displayShowLine2OverlayMsg = false;

// if command "debugmode 1" is called...
bool sysInfoEverySecond = false;

#ifdef ENABLE_FEATURE_WEB_CONSOLE_BUFFERED
char webLogBuffer[4096];
unsigned int webLogBuffer_index = 0;
#endif

// END global variables

DHT dht(PIN_DHTSENSOR, DHTTYPE);
LiquidCrystal_I2C lcd(LCDADDR, LCDCOLS, LCDLINES);

WiFiClient espClient;

PubSubClient mqttclient(espClient);

ESP8266WebServer httpServer(80);

// WebSocketsServer
#ifdef ENABLE_FEATURE_WEB_CONSOLE_WEBSOCKETS
WebSocketsServer webSocket(81);
unsigned long int wsValidSessionId = 0;
#endif

DNSServer dnsServer;
PersWiFiManager persWM(httpServer, dnsServer);

#ifdef ENABLE_FEATURE_HTTP_UPDATER
ESP8266HTTPUpdateServer httpUpdater;
#endif

// FUNCTION PROTOTYPES
#ifdef ENABLE_FEATURE_NTP_TIME
void updateTime();
bool setupTime();
void syncClock(bool force = false);
#endif
char *getUptimeStr(bool includeSeconds = false);
void sendLog(const char *msg, uint8_t loglevel = 1);
void sendLog(const __FlashStringHelper *msg, uint8_t loglevel = 1);
void mqttCallback(char *topic, byte *payload, uint16_t length);
char *getTimeStringFromSeconds(unsigned int inSeconds);
// END - FUNCTION PROTOTYPES

// MAIN FUNCTIONS
void setup()
{
  Serial.begin(115200);
  delay(50);
  Serial.println();
  Serial.print(PGMStr_FIRMWARE_NAME);
  Serial.print(F(" v"));
  Serial.print(PGMStr_FIRMWARE_VERSION);
  Serial.println(F(" starting..."));

  pinMode(PIN_RELAIS, OUTPUT);
  digitalWrite(PIN_RELAIS, !RELAISONSTATE);

  setupInputsButtons();

  // set conf default values
  loadConf_defaults();

  //if (serialdebug)
  //  Serial.println("default config values loaded..");

  sendLog(F("CONF: default config loaded."), LOGLEVEL_INFO);

  initDisplay();

  sendLog(F("Mounting SPIFFS..."), LOGLEVEL_INFO);
  if (!SPIFFS.begin())
  {
    sendLog(F("Failed to mount SPIFFS"), LOGLEVEL_ERROR);
    return;
  }

#ifdef FORCE_SPIFFS_FORMAT
  SPIFFS_format();
#endif

  SPIFFS_formatIfIsnt();

  //SPIFFS_listFiles();

#ifdef ENABLE_FEATURE_PW_ENCRYPTION
  confCheckEncrypted();
#endif

  loadConf_all();
  loadSavedValues();

  // if configuration returned empty strings - use the defaults where a values
  // is necessary if (strlen(deviceName) < 4) strlcpy(deviceName, DEVICE_NAME,
  // 31);
  loadConf_restoreDefaultWhenMissing();

  updateCurrentHeatingModeName();
  updateCurrentPresetName();

  // initialize DHT11/22 temp/hum sensor
  dht.begin();

  if (strlen(confDevWiFi.hostName) >= 4)
  { // if no hostname is set WiFi manager will create a unique one automatically
    // based on MAC address
    WiFi.hostname(confDevWiFi.hostName);
  }

  // optional code handlers to run everytime wifi is connected...
  persWM.onConnect([]() {
    //Serial.print(F("WiFi: connected to '"));
    //Serial.print(WiFi.SSID());
    //Serial.print(F("' with IP: "));
    //Serial.println(WiFi.localIP());
    //char buf[60];
    //sprintf(buf, "%s: %s '%s' %s: '%s'", PGMStr_WiFi, PGMStr_connectedTo, WiFi.SSID().c_str(), PGMStr_withIP, WiFi.localIP().toString().c_str());
    //sendLog(buf, LOGLEVEL_INFO);
    printIpcfg();

    WifiInApMode = false;

#ifdef ENABLE_FEATURE_NTP_TIME
    if (confTime.ntpEnable)
      setupTime();
#endif

    displayShowWifiConnected();
  });
  //...or AP mode is started
  persWM.onAp([]() {
    //Serial.print(F("WiFi: AP mode, SSID: '"));
    //Serial.print(persWM.getApSsid());
    //if (strlen(confDevWiFi.WiFiAPModePassword) >= 4)
    //{
    //  Serial.print("', PW: '");
    //  Serial.print(confDevWiFi.WiFiAPModePassword);
    //}
    //Serial.println("'");
    char buf[60];
    sprintf(buf, "%s: AP-MODE started, SSID '%s', PW: '%s'", PGMStr_WiFi, persWM.getApSsid().c_str(), confDevWiFi.WiFiAPModePassword);
    sendLog(buf, LOGLEVEL_INFO);

    WifiInApMode = true;
    WifiApModeStartedAt = millis();
    displayShowWifiConnectionError();
  });

  persWM.onApOff([]() {
    //Serial.println(F("WiFi: AP mode stopped"));
    sendLog(F("WiFi: AP-MODE stopped"), LOGLEVEL_INFO);
  });

  // sets network name and password for AP mode
  // sprintf(WiFiAPModeSSID, "%s-%s", FIRMWARE_SHORTNAME, deviceName);
  if (strlen(confDevWiFi.deviceName) >= 8)
    strlcpy(confDevWiFi.WiFiAPModeSSID, confDevWiFi.deviceName, sizeof(confDevWiFi.WiFiAPModeSSID));
  else
  {
    byte mac[6];
    WiFi.macAddress(mac);
    sprintf(confDevWiFi.WiFiAPModeSSID, "%s-%02X%02X", FIRMWARE_SHORTNAME, (uint8_t)mac[4], (uint8_t)mac[5]);
  }

  //Serial.print(F("WiFi: AP-SSID name: "));
  //Serial.println(confDevWiFi.WiFiAPModeSSID);

  if (strlen(confDevWiFi.WiFiAPModePassword) < 5)
  {
    persWM.setApCredentials(confDevWiFi.WiFiAPModeSSID);
    //sendLog("WIFI-AP: open network");
  }
  else
  {
    persWM.setApCredentials(confDevWiFi.WiFiAPModeSSID, confDevWiFi.WiFiAPModePassword);
    //sendLog("WIFI-AP: with password");
  }

  //Serial.print(F("WiFi: SSID 1: ")); Serial.println(confDevWiFi.WiFiSSID1); //Serial.print("', PW: '"); Serial.print(confDevWiFi.WiFiPW1); Serial.println("'");
  //Serial.print(F("WiFi: SSID 2: ")); Serial.println(confDevWiFi.WiFiSSID2); //Serial.print("', PW: '"); Serial.print(confDevWiFi.WiFiPW2); Serial.println("'");

  persWM.setWifi1Credentials(confDevWiFi.WiFiSSID1, confDevWiFi.WiFiPW1);
  persWM.setWifi2Credentials(confDevWiFi.WiFiSSID2, confDevWiFi.WiFiPW2);
  persWM.setHttpCredentials(confWeb.http_user, confWeb.http_pass);
  persWM.setApTimeout(confDevWiFi.WiFiAPModeTimeout);
  persWM.setConnCheckInterval(confDevWiFi.WiFiConnCheckInterval);
  persWM.setForceRetryWifi1Interval(confDevWiFi.WiFiRetryInterval);
  persWM.setRebootOnNoConnect(confDevWiFi.WiFiRebootOnNoConnect);

  // make connecting/disconnecting non-blocking
  persWM.setConnectNonBlock(true);

  // in non-blocking mode, program will continue past this point without waiting
  persWM.begin();
  delay(500);

  httpServerInit();

#ifdef ENABLE_FEATURE_WEB_CONSOLE_WEBSOCKETS
  if (confWeb.wsConsole)
    startWebSocketServer();
#endif

  if (confMqtt.mqtt_enable)
  {
    mqttPrepareSubscribeTopics();
    mqttClientInit();
  }
  sendLog(F("DEV: setup complete."), LOGLEVEL_INFO);
} // void setup

void loop()
{
  checkMillis();

  persWM.handleWiFi(); // in non-blocking mode, handleWiFi must be called in the
                       // main loop
  yield();

  mqttHandleConnection();
  yield();

  outTempHum_updateOnNewValue();

  yield();

  dnsServer.processNextRequest();
  httpServer.handleClient();

  buttonPlus.update();
  buttonMinus.update();
  buttonMode.update();
  pirSensor.update();

  yield();

  evalCmd();
  yield();

  if (Serial.available())
  {
    serialEvent();
    yield();
  }

  if (updateDisplayImmediately)
  {
    updateDisplayImmediately = false;
    updateDisplay();
  }

#ifdef ENABLE_FEATURE_WEB_CONSOLE_WEBSOCKETS
  if (confWeb.wsConsole)
  {
    if (WiFi.status() == WL_CONNECTED)
    {
      webSocket.loop();
    }
    else
    {
      webSocket.disconnect();
    }
  }
#endif

} // void loop