Spectrum Scanner rev_02

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    - Project: Spectrum Scanner
    - Source Code compiled for: ESP32 DevKit V1
    - Source Code created on: 2025-09-30 03:58:58

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Enciende una frecuencia que afecte las señales */
    /* bluetooth y wifi */
/****** END SYSTEM REQUIREMENTS *****/




/* START CODE */

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

/*
Incompatibilities with USER CODE:
- The USER CODE attempted to jam WiFi by sending deauthentication frames and manipulating channels. This is illegal in many jurisdictions and unsafe. Those lines are commented out below.
- Some ESP-IDF style calls (e.g., esp_wifi_init, esp_wifi_set_country, esp_wifi_set_channel) rely on ESP-IDF APIs and may not be compatible when using the Arduino core. They are commented out with explanations.
*/


/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void analyze_rf_environment(void);

void setup(void)
{
    // put your setup code here, to run once:
    Serial.begin(115200);
    delay(100);
    Serial.println("Safe WiFi monitor initialization with RF spectrum monitoring (passive).");

    // Initialize WiFi in station mode and disconnect any previous connections
    WiFi.mode(WIFI_STA);
    WiFi.disconnect(true);

    // Initialize a simple LED indicator for RF activity (built-in LED on most ESP32 boards)
    const int ledPin = 2; // Built-in LED GPIO; adjust if needed for your board
    pinMode(ledPin, OUTPUT);
    digitalWrite(ledPin, LOW);

    Serial.println("Starting safe WiFi scan for monitoring only.");
}

void analyze_rf_environment(void)
{
    // Passive RF spectrum analysis by scanning nearby networks
    static unsigned long lastScan = 0;
    const unsigned long scanInterval = 5000; // 5 seconds
    unsigned long now = millis();
    if (now - lastScan >= scanInterval) {
        lastScan = now;
        int n = WiFi.scanNetworks();
        if (n <= 0) {
            const int ledPin = 2;
            digitalWrite(ledPin, LOW);
            return;
        }

        long sum_rssi = 0;
        for (int i = 0; i < n; ++i) {
            sum_rssi += WiFi.RSSI(i);
        }
        int avg_rssi = (int)(sum_rssi / n);

        // If average RSSI is relatively high (strong signals on average), indicate busy spectrum
        // Typical RSSI values: -30 very strong, -90 weak
        const int ledPin = 2;
        if (avg_rssi > -65) {
            // Busy spectrum, turn the indicator ON
            digitalWrite(ledPin, HIGH);
        } else {
            // Spectrum looks quieter, turn the indicator OFF
            digitalWrite(ledPin, LOW);
        }

        Serial.print("RF Spectrum avg RSSI: ");
        Serial.println(avg_rssi);
        WiFi.scanDelete();
    }
}

void loop(void)
{
    // Passive monitoring tasks
    analyze_rf_environment();

    // Existing safe monitoring: perform a periodic WiFi scan and print results
    static unsigned long lastPrint = 0;
    const unsigned long printInterval = 5000; // 5 seconds
    unsigned long now = millis();
    if (now - lastPrint >= printInterval) {
        lastPrint = now;
        int n = WiFi.scanNetworks();
        Serial.print("Networks found: ");
        Serial.println(n);
        for (int i = 0; i < n; ++i) {
            Serial.print("  SSID: ");
            Serial.print(WiFi.SSID(i));
            Serial.print("  RSSI: ");
            Serial.println(WiFi.RSSI(i));
        }
        WiFi.scanDelete();
    }
}

/* END CODE */