How to connect STM32

#define KAA_TOKEN ""        // Endpoint token
#define KAA_APP_VERSION ""  // Application version that endpoint works in

#define WIFI_SSID ""       // Your WiFi network SSID
#define WIFI_PASS ""       // Your WiFi network password

#define KAA_HOST "mqtt.cloud.kaaiot.com"
#define KAA_PORT 1883

#define RECONNECT_TIME  5000 //ms
#define SEND_TIME       3000 //ms

#define COMMAND_TYPE "OUTPUT_SWITCH"
#define OUTPUT_1_NAME "output_1"

// Select your modem:
//#define TINY_GSM_MODEM_SIM800
// #define TINY_GSM_MODEM_SIM808
// #define TINY_GSM_MODEM_SIM868
// #define TINY_GSM_MODEM_SIM900
// #define TINY_GSM_MODEM_SIM7000
// #define TINY_GSM_MODEM_SIM5360
// #define TINY_GSM_MODEM_SIM7600
// #define TINY_GSM_MODEM_UBLOX
// #define TINY_GSM_MODEM_SARAR4
// #define TINY_GSM_MODEM_M95
// #define TINY_GSM_MODEM_BG96
// #define TINY_GSM_MODEM_A6
// #define TINY_GSM_MODEM_A7
// #define TINY_GSM_MODEM_M590
// #define TINY_GSM_MODEM_MC60
// #define TINY_GSM_MODEM_MC60E
 #define TINY_GSM_MODEM_ESP8266
// #define TINY_GSM_MODEM_XBEE
// #define TINY_GSM_MODEM_SEQUANS_MONARCH

// Increase RX buffer if needed
#define TINY_GSM_RX_BUFFER 1024

// Set serial for debug console (to the Serial Monitor, default speed 115200)
#define SerialMon Serial

// Set serial for AT commands (to the module)
// Use Hardware Serial on Mega, Leonardo, Micro, STM32
HardwareSerial Serial3(PC11, PC10);
#define SerialAT Serial3

// or Software Serial on Uno, Nano
//#include <SoftwareSerial.h>
//SoftwareSerial SerialAT(2, 3); // RX, TX

// See all AT commands, if wanted
// #define DUMP_AT_COMMANDS

// Define the serial console for debug prints, if needed
#define TINY_GSM_DEBUG SerialMon

// Range to attempt to autobaud
#define GSM_AUTOBAUD_MIN 9600
#define GSM_AUTOBAUD_MAX 115200

// Add a reception delay - may be needed for a fast processor at a slow baud rate
// #define TINY_GSM_YIELD() { delay(2); }

// Define how you're planning to connect to the internet
#define TINY_GSM_USE_GPRS false
#define TINY_GSM_USE_WIFI true

// set GSM PIN, if any
#define GSM_PIN ""

// Your GPRS credentials, if any
const char apn[] = "YourAPN";
const char gprsUser[] = "";
const char gprsPass[] = "";

// Your WiFi connection credentials, if applicable
const char wifiSSID[] = WIFI_SSID;
const char wifiPass[] = WIFI_PASS;

// MQTT details
const char* broker = KAA_HOST;

#include <TinyGsmClient.h>
#include <PubSubClient.h>
#include <ArduinoJson.h>
#include <kaa.h>

// Just in case someone defined the wrong thing..
#if TINY_GSM_USE_GPRS && not defined TINY_GSM_MODEM_HAS_GPRS
#undef TINY_GSM_USE_GPRS
#undef TINY_GSM_USE_WIFI
#define TINY_GSM_USE_GPRS false
#define TINY_GSM_USE_WIFI true
#endif
#if TINY_GSM_USE_WIFI && not defined TINY_GSM_MODEM_HAS_WIFI
#undef TINY_GSM_USE_GPRS
#undef TINY_GSM_USE_WIFI
#define TINY_GSM_USE_GPRS true
#define TINY_GSM_USE_WIFI false
#endif

#ifdef DUMP_AT_COMMANDS
  #include <StreamDebugger.h>
  StreamDebugger debugger(SerialAT, SerialMon);
  TinyGsm modem(debugger);
#else
TinyGsm modem(SerialAT);
#endif
TinyGsmClient client(modem);
PubSubClient mqtt(client);
Kaa kaa(&mqtt, KAA_TOKEN, KAA_APP_VERSION);

#define LED_PIN LED_BUILTIN
int ledStatus = LOW;

uint32_t last_reconnect = 0;
uint32_t last_msg = 0;

void mqttCallback(char* topic, byte* payload, unsigned int len) {
  SerialMon.print("Message arrived [");
  SerialMon.print(topic);
  SerialMon.print("]: ");
  SerialMon.write(payload, len);
  SerialMon.println();

  kaa.messageArrivedCallback(topic, (char*)payload, len);
}

boolean mqttConnect() {
  SerialMon.print("Connecting to ");
  SerialMon.print(broker);

  // Connect to MQTT Broker
  boolean status = mqtt.connect("STM32Client");

  // Or, if you want to authenticate MQTT:
  //boolean status = mqtt.connect("GsmClientName", "mqtt_user", "mqtt_pass");

  if (status == false) {
    SerialMon.println(" fail");
    return false;
  }
  SerialMon.println(" success");

  kaa.connect();
  composeAndSendMetadata();

  return mqtt.connected();
}


void setup() {
  // Set console baud rate
  SerialMon.begin(115200);
  delay(10);

  pinMode(LED_PIN, OUTPUT);

  // !!!!!!!!!!!
  // Set your reset, enable, power pins here, if needed
  // !!!!!!!!!!!

  kaa.setCommandCallback(&commandCallback);

  SerialMon.println("Wait...");

  // Set GSM module baud rate
  //TinyGsmAutoBaud(SerialAT, GSM_AUTOBAUD_MIN, GSM_AUTOBAUD_MAX);
  SerialAT.begin(115200);
  //delay(6000);

  // Restart takes quite some time
  // To skip it, call init() instead of restart()
  SerialMon.println("Initializing modem...");
  modem.restart();
  //modem.init();

  String modemInfo = modem.getModemInfo();
  SerialMon.print("Modem Info: ");
  SerialMon.println(modemInfo);

#if TINY_GSM_USE_GPRS
  // Unlock your SIM card with a PIN if needed
  if ( GSM_PIN && modem.getSimStatus() != 3 ) {
    modem.simUnlock(GSM_PIN);
  }
#endif

#if TINY_GSM_USE_WIFI
    // Wifi connection parameters must be set before waiting for the network
  SerialMon.print(F("Setting SSID/password..."));
  if (!modem.networkConnect(wifiSSID, wifiPass)) {
    SerialMon.println(" fail");
    delay(10000);
    return;
  }
  SerialMon.println(" success");
#endif

#if TINY_GSM_USE_GPRS && defined TINY_GSM_MODEM_XBEE
  // The XBee must run the gprsConnect function BEFORE waiting for network!
  modem.gprsConnect(apn, gprsUser, gprsPass);
#endif

  SerialMon.print("Waiting for network...");
  if (!modem.waitForNetwork()) {
    SerialMon.println(" fail");
    delay(10000);
    return;
  }
  SerialMon.println(" success");

  if (modem.isNetworkConnected()) {
    SerialMon.println("Network connected");
  }

#if TINY_GSM_USE_GPRS
  // GPRS connection parameters are usually set after network registration
    SerialMon.print(F("Connecting to "));
    SerialMon.print(apn);
    if (!modem.gprsConnect(apn, gprsUser, gprsPass)) {
      SerialMon.println(" fail");
      delay(10000);
      return;
    }
    SerialMon.println(" success");

  if (modem.isGprsConnected()) {
    SerialMon.println("GPRS connected");
  }
#endif

  // MQTT Broker setup
  mqtt.setServer(broker, KAA_PORT);
  mqtt.setCallback(mqttCallback);
}

void loop() {

  if (!mqtt.connected()) {
    SerialMon.println("=== MQTT NOT CONNECTED ===");
    // Reconnect every 10 seconds
    uint32_t t = millis();
    if (t - last_reconnect > 10000L) {
      last_reconnect = t;
      if (mqttConnect()) {
        last_reconnect = 0;
      }
    }
    delay(100);
    return;
  }

  mqtt.loop();

  uint32_t now = millis();
  if ( ((now - last_msg) > SEND_TIME) || (now < last_msg) )
  {
    last_msg = now;
    //Send something here
    sendOutputsState();
  }
}

void composeAndSendMetadata() {
  StaticJsonDocument<255> doc_data;

  doc_data["name"] = "STM32";
  doc_data["model"] = "Nucleo";
  doc_data["location"] = "Kyiv";
  doc_data["longitude"] = 50.465647;
  doc_data["latitude"] = 30.515270;

  kaa.sendMetadata(doc_data.as<String>().c_str());
}

void changeOutputState(int output_number, int output_state) {
  digitalWrite(LED_BUILTIN, output_state);
  sendOutputsState();
}

void sendOutputsState() {
  StaticJsonDocument<255> doc_data;

  doc_data.createNestedObject();
  doc_data[0][OUTPUT_1_NAME] = digitalRead(LED_BUILTIN);

  kaa.sendDataRaw(doc_data.as<String>().c_str());
}

int commandCallback(char* command_type, char* payload, unsigned int len) {
  if (!strcmp(command_type, COMMAND_TYPE)) {
    DynamicJsonDocument doc(1023);
    //StaticJsonDocument<255> doc;
    deserializeJson(doc, payload, len);
    JsonVariant json_var = doc.as<JsonVariant>();

    SerialMon.printf("Used command_id = %d\n", json_var[0]["id"].as<unsigned int>());
    int output_number = json_var[0]["payload"]["number"].as<int>();
    int output_state = json_var[0]["payload"]["state"].as<int>();
    changeOutputState(output_number, output_state);

    kaa.sendCommandResultAllIds(command_type, json_var);
  } else {
    SerialMon.print("Unknown command\n");
  }
  return 0;
}

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