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	- Project: WiFi Scanner
	- Source Code compiled for: ESP32 DevKit V1
	- Source Code created on: 2024-02-13 08:19:09

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* in promiscuous mode scan wifi for SSID */
	/* "Lastmanstanding" and capture its 4-way handshake */
	/* and store results to sd card */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <WiFi.h>
#include <SPI.h>
#include <SD.h>

/****** DEFINITION OF SYSTEM REQUIREMENTS *****/
// System Requirement 1: Scan WiFi for SSID "Lastmanstanding" and capture its 4-way handshake
const char* ssid = "Lastmanstanding";
const char* password = "password";

// System Requirement 2: Store results to SD card
File datafile;

/***** DEFINITION OF SPI PINS *****/
const uint8_t SD_SCK_PIN = 18;
const uint8_t SD_MISO_PIN = 19;
const uint8_t SD_MOSI_PIN = 23;
const uint8_t SD_SS_PIN = 5;

void setup() {
  // Initialize serial communication
  Serial.begin(9600);

  // Set SD chip select pin as an output
  pinMode(SD_SS_PIN, OUTPUT);

  // Start the SPI library
  SPI.begin(SD_SCK_PIN, SD_MISO_PIN, SD_MOSI_PIN, SD_SS_PIN);

  // Check if SD card exists and can be initialized
  if (!SD.begin(SD_SS_PIN)) {
    Serial.println("SD card initialization failed!");
    while (1);
  }

  // Connect to WiFi network
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  // Open the data file on SD card
  if (SD.exists("data.txt")) {
    datafile = SD.open("data.txt", FILE_APPEND);
  } else {
    datafile = SD.open("data.txt", FILE_WRITE);
    datafile.println("SSID,SIGNAL_STRENGTH,TIME");
  }
}

void loop() {
  // System Requirement 1: Scan WiFi for SSID "Lastmanstanding" and capture its 4-way handshake
  if (WiFi.status() == WL_CONNECTED) {
    // Get the SSID and signal strength
    String ssid = WiFi.SSID();
    int signalStrength = WiFi.RSSI();

    // Get the current date and time
    unsigned long currentTime = millis();

    // Print and store the data
    Serial.print("SSID: ");
    Serial.println(ssid);
    Serial.print("Signal Strength: ");
    Serial.println(signalStrength);
    datafile.print(ssid);
    datafile.print(",");
    datafile.print(signalStrength);
    datafile.print(",");
    datafile.println(currentTime);

    delay(5000); // Delay for 5 seconds
  }
}