# ble_firmware_update.py - Simulated BLE peripheral accepting firmware writes
from bleak import BleakServer, BleakGATTCharacteristic
import asyncio

class FirmwareService:
    def __init__(self):
        self.firmware_data = bytearray()

    def write_characteristic(self, data):
        self.firmware_data.extend(data)
        if len(self.firmware_data) > 1024:
            print("Firmware update received, applying... (malicious possible)")

async def main():
    server = BleakServer()
    await server.start()
    # Expose a characteristic with no authentication
    char = BleakGATTCharacteristic(
        uuid='12345678-1234-1234-1234-123456789abc',
        properties=['write'],
        permissions=['write'],
        on_write=lambda value: firmware_service.write_characteristic(value)
    )
    # register service...
    await asyncio.sleep(3600)

firmware_service = FirmwareService()
asyncio.run(main())

python ble_firmware_update.py