import machine
import time
import math

# Setup ADC for NTC Sensor on GPIO 34
adc = machine.ADC(machine.Pin(34))
adc.atten(machine.ADC.ATTN_11DB)  # 11dB attenuation (0-3.3V range)

# Thermistor Parameters
R_NOMINAL = 10000  # 10kΩ thermistor at 25°C
B_COEFFICIENT = 3950  # Beta value
SERIES_RESISTOR = 10000  # 10kΩ pull-up resistor
VCC = 3.3  # Supply voltage

# Wi-Fi Connection Simulation
wifi_ip = "192.168.1.100"
gateway = "192.168.1.1"
dns_server = "8.8.8.8"

print(f"Connected to Wi-Fi: IP={wifi_ip}, Gateway={gateway}, DNS={dns_server}")

def read_temperature():
    """Reads ADC value and converts it to temperature using the thermistor formula."""
    raw_value = adc.read()  # Read ADC value (0-4095)
    if raw_value == 0:
        print("Error: ADC read 0, check wiring!")
        return None
    
    voltage = raw_value * (VCC / 4095)  # Convert to voltage

    # Prevent division by zero error
    if voltage == 0:
        print("Error: Invalid voltage reading, check sensor!")
        return None
    
    resistance = SERIES_RESISTOR * (VCC / voltage - 1)

    # Apply the Steinhart-Hart equation
    temperature = 1 / (1 / (273.15 + 25) + (1 / B_COEFFICIENT) * math.log(resistance / R_NOMINAL))
    temperature -= 273.15  # Convert Kelvin to Celsius

    return round(temperature, 2)  # Round for readability

while True:
    try:
        temperature = read_temperature()
        if temperature is None:
            continue

        print(f"Client Sending: Temperature={temperature}°C")

        # Simulate MITM Attack
        print(f"[ATTACK] Intercepted Data: Temperature={temperature}°C")

        # Modify intercepted data (example: increase by 10°C)
        modified_temp = temperature + 10
        print(f"[ATTACK] Modified Data Sent: Temperature={modified_temp}°C")

        # Simulated Server Response
        print(f"Server Received: Temperature={modified_temp}°C\n")

        time.sleep(3)  # Delay before next read

    except Exception as e:
        print("Error:", e)
        time.sleep(2)