**GPS SMS** rev_01

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    - Project: **GPS SMS**
    - Source Code NOT compiled for: ESP32 DevKit V1
    - Source Code created on: 2025-03-17 06:06:41

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Upon receiving an SMS with "sendloc," the SIM900A */
    /* triggers the ESP32 to send GPS coordinates via */
    /* SMS. Activating pin D14 for 5 seconds sends the */
    /* location to a predefined number. Setting pin RX2 */
    /* high activates a specific function. */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <SoftwareSerial.h> //https://github.com/plerup/espsoftwareserial
#include <sim900.h> //https://github.com/nthnn
#include <EasyButton.h> //https://github.com/evert-arias/EasyButton

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void sendLocation(); // Function to send GPS location
void checkForSMS(); // Function to check for incoming SMS

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t b1_PushButton_PIN_D14     = 14;
const uint8_t b2_PushButton_PIN_RX2     = RX2;

/***** DEFINITION OF Software Serial *****/
const uint8_t sim_SIM900A_Serial_PIN_SERIAL_TX_D4       = 4;
const uint8_t sim_SIM900A_Serial_PIN_SERIAL_RX_D13      = 13;
EspSoftwareSerial::UART sim_SIM900A_Serial;

// Create an instance of the SIM900 class
SIM900 sim900(&sim_SIM900A_Serial);

// Create an instance of the EasyButton class
EasyButton button(b1_PushButton_PIN_D14);

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/

void setup(void)
{
    // put your setup code here, to run once:

    pinMode(b1_PushButton_PIN_D14, INPUT_PULLUP);
    pinMode(b2_PushButton_PIN_RX2, INPUT_PULLUP);

    sim_SIM900A_Serial.begin(9600, SWSERIAL_8N1, sim_SIM900A_Serial_PIN_SERIAL_RX_D13, sim_SIM900A_Serial_PIN_SERIAL_TX_D4, false);

    // Initialize SIM900
    if (sim900.handshake()) {
        Serial.println("SIM900 is ready");
    } else {
        Serial.println("SIM900 initialization failed");
    }

    // Initialize EasyButton
    button.begin();
}

void loop(void)
{
    // put your main code here, to run repeatedly:
    checkForSMS(); // Check for incoming SMS

    // Check button state
    button.update();
    if (button.isPressed()) {
        // Activate specific function when button is pressed
        digitalWrite(b2_PushButton_PIN_RX2, HIGH);
        delay(5000); // Keep it high for 5 seconds
        digitalWrite(b2_PushButton_PIN_RX2, LOW);
    }
}

// Function to check for incoming SMS
void checkForSMS() {
    if (sim900.isCardReady()) {
        String sms = sim900.getResponse(); // Assuming this function retrieves SMS
        if (sms.indexOf("sendloc") != -1) {
            sendLocation(); // Call function to send location
        }
    }
}

// Function to send GPS location via SMS
void sendLocation() {
    // Assuming we have a function to get GPS coordinates
    String location = "Latitude: 12.345678, Longitude: 98.765432"; // Example coordinates
    sim900.sendSMS("1234567890", location); // Replace with the predefined number
}

/* END CODE */