// Arduino IDE 2.3.4, board set: NodeMCU-32S
// remember
// for UPLOAD press right button ( when WIFI antenna UP )
// for RESET press left button
#include "secrets.h" // ______________________________________ here find the router login SSID PASSWORD ...
//#include <time.h>

#include <WiFi.h>
#if MQTT_SECURE
#include <WiFiClientSecure.h>
WiFiClientSecure wifiClient;
#else
#include <WiFiClient.h>
WiFiClient wifiClient;
#endif

const char *ssid = SECRET_SSID;
const char *password = SECRET_PASSWORD;
IPAddress thisip(FIXIP); // ___________________________________ fix IP
bool WIFI_OK = false;
unsigned long lastWIFIms = millis();
unsigned long nowWIFIms=lastWIFIms;

#include <MQTT.h>  // __________________________________________ ESP32 internal MQTT with TLS
MQTTClient mqttclient;

// the selection what broker is used / and if TLS / see secrets.h
const char *mqtt_broker = SECRET_MQTTBROKER; // ___________________________________ MQTT IP broker // SECRET_LMQTTBROKER not work
const char *mqtt_clientid = MQTT_CLIENTID;
const int  mqtt_port = MQTT_port;
const char *mqtt_user = SECRET_MQTTUSER;
const char *mqtt_pass = SECRET_MQTTPW;

const char *mqtt_stopic = sTOPIC; // mqtt init status
const char *mqtt_dtopic = dTOPIC; // data reporting
const char *mqtt_rtopic = rTOPIC; // remote operation

bool MQTT_OK = false; // change because i not want to get it stuck if no broker online BUT now, if start broker later, must reset board
int MQTT_count = 0;
String MQTTs = " MQTTs ";
String msg = "";
char MQTTc[250];
String REMOTE_CMD="";
bool REMOTE_IN = false;
// _________________________________________________________________ ONBOARD LED on NODEMCU ESP32S V1.1 is BLUE and not need pin declaration
bool thisLED_status = 0;

void LED_toggle() {
  thisLED_status = !thisLED_status;
  digitalWrite(LED_BUILTIN, thisLED_status);
  Serial.println("gpio LED_TOGGLE");
}

void callback(String &atopic, String &apayload) { // try new MQTT.h callback
  // what MQTT commands we might get: TOGGLE
  if (apayload == "TOGGLE") {
      LED_toggle();
  }
  else { // something not understood?
      Serial.print("\nmqtt Message arrived in topic: ");
      Serial.print(atopic);
      Serial.print(" : ");
      Serial.println(apayload);
  }
}

void setup_MQTT(){
  msg="mqtt setup_MQTT";

#if MQTT_SECURE
  wifiClient.setInsecure();  // secure but not check server cert
#endif

  mqttclient.begin(mqtt_broker, mqtt_port,wifiClient);
  mqttclient.setKeepAlive(100);
  mqttclient.onMessage(callback);


  if ( !MQTT_OK ) {
    msg+="\nmqtt try connect to MQTT broker ...";
    if (mqttclient.connect(mqtt_clientid, mqtt_user, mqtt_pass)) {
      msg+="\nmqtt broker: ";
      msg+=mqtt_broker;
      msg+=" connected";
      MQTT_OK = true;
      
    } else {
      msg+="failed ";
    }
  }
  Serial.println(msg);

  if ( MQTT_OK ) {
    // Publish and subscribe
    mqttclient.publish(mqtt_stopic, MQTT_STATUS); 
    msg ="mqtt publish to topic: \n" + String(mqtt_stopic);
    msg+="\n" + String(mqtt_dtopic);
    msg+="\nmqtt subscribe to: \n" + String(mqtt_rtopic);
    mqttclient.subscribe(mqtt_rtopic);
    Serial.println(msg);
  }
}

void setup_WIFI(){
  WiFi.mode(WIFI_STA);
  WiFi.setMinSecurity(WIFI_AUTH_WEP);  // should help on certain router problems
  WiFi.config(thisip);

  if ( !WIFI_OK ) {
    Serial.println();
    //WiFi.disconnect();
    //delay(1000);
    msg = "www WIFI_connect / begin returns: ";
    msg += String( WiFi.begin(ssid, password) )+"\n";
    while ( ( !WiFi.isConnected() ) && ( lastWIFIms + 30000 > nowWIFIms ) )
    {
      delay(1000);
      Serial.print("w");
    }
    if ( WiFi.status() == WL_CONNECTED ){
      WIFI_OK = true;
    } else {
      WIFI_OK = false;
    }
    Serial.println(msg);
  }
}


void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, LOW); // _______________________________ later operated by webpage and local MQTT
  LED_toggle(); // _________________________________________________ see LED change to know board working

  Serial.begin(115200); // __________________________________________ talk to serial
  while (!Serial && (millis() < 10000));
  Serial.println();

  msg="ESP32 on Arduino IDE 2\nmodel: ";
  msg += ESP.getChipModel();
  Serial.println(msg);

  setup_WIFI();

  setup_MQTT(); 

}

unsigned long lastTms = millis();
int lastTsec = 0;

void loop() {
  if ( lastTms +1000 < millis() ) { // __________________________ 1 sec job
    lastTms = millis();
    mqttclient.loop();
    Serial.print(".");
    lastTsec += 1;
    if ( lastTsec >= 60 ) { // __________________________________ 1 min job
      lastTsec = 0;
      MQTT_count += 1;
      msg = "min_rep ";
      msg += String(MQTT_count);
      Serial.println(msg);
      mqttclient.publish(mqtt_dtopic,msg);
    }
  }

}






// need a file: secrets.h
/*
#define SECRET_SSID "<SSID>"
#define SECRET_PASSWORD "<PASSWORD>"

#define FIXIP {192,168,1,214}

// REMOTE BROKER
#define SECRET_MQTTBROKER "<xxx.hivemq.cloud>"
#define SECRET_MQTTUSER "<user>"
#define SECRET_MQTTPW "<password>"
#define MQTT_port 8883
#define MQTT_SECURE true
#define MQTT_CLIENTID "ESP32s D214"
#define MQTT_STATUS "ESP32s ArduinoIDE"

#define sTOPIC "ESP32S/D214/status"
#define bTOPIC "ESP32S/D214/log"
#define dTOPIC "ESP32S/D214/data"
#define rTOPIC "ESP32S/D214/set" //'LED TOGGLE'
*/