// Please select the corresponding model

// #define SIM800L_IP5306_VERSION_20190610
// #define SIM800L_AXP192_VERSION_20200327
// #define SIM800C_AXP192_VERSION_20200609
// #define SIM800L_IP5306_VERSION_20200811

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

#include "utilities.h"

// Set serial for debug console (to the Serial Monitor, default speed 115200)
#define SerialMon Serial
// Set serial for AT commands (to the module)
#define SerialAT  Serial1

// Configure TinyGSM library
#define TINY_GSM_MODEM_SIM800          // Modem is SIM800
#define TINY_GSM_RX_BUFFER      1024   // Set RX buffer to 1Kb

#include <TinyGsmClient.h>

#ifdef DUMP_AT_COMMANDS
#include <StreamDebugger.h>
StreamDebugger debugger(SerialAT, SerialMon);
TinyGsm modem(debugger);
#else
TinyGsm modem(SerialAT);
#endif

#define uS_TO_S_FACTOR 1000000ULL  /* Conversion factor for micro seconds to seconds */
#define TIME_TO_SLEEP  300        /* Time ESP32 will go to sleep (in seconds) */

bool reply = false;

TinyGsmClient client(modem);


void setupModem()
{
#ifdef MODEM_RST
    // Keep reset high
    pinMode(MODEM_RST, OUTPUT);
    digitalWrite(MODEM_RST, HIGH);
#endif

    pinMode(MODEM_PWRKEY, OUTPUT);
    pinMode(MODEM_POWER_ON, OUTPUT);

    // Turn on the Modem power first
    digitalWrite(MODEM_POWER_ON, HIGH);

    // Pull down PWRKEY for more than 1 second according to manual requirements
    digitalWrite(MODEM_PWRKEY, HIGH);
    delay(100);
    digitalWrite(MODEM_PWRKEY, LOW);
    delay(1000);
    digitalWrite(MODEM_PWRKEY, HIGH);

    // Initialize the indicator as an output
    pinMode(LED_GPIO, OUTPUT);
    digitalWrite(LED_GPIO, LED_OFF);
}

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

    delay(10);

    // Start power management
    if (setupPMU() == false) {
        Serial.println("Setting power error");
    }

    // Some start operations
    setupModem();

    // Set GSM module baud rate and UART pins
    SerialAT.begin(115200, SERIAL_8N1, MODEM_RX, MODEM_TX);

}

void loop()
{
    bool ret = modem.restart();
    if (ret == false) {
        Serial.println("restart ..");
        return;
    }

    Serial.println("Set  SIM800X keep active on");

    // Set IO25 to sleep hold, so that when ESP32 sleeps, SIM800X will keep power and running
    gpio_hold_en(GPIO_NUM_25);  //MODEM_POWER_ON

    esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);

    esp_deep_sleep_start();
}