Thermopro TP920 Python Communication Testing

import asyncio
from bleak import BleakClient

DEVICE_ADDRESS = "CE:51:8C:f0:BC:DB"

WRITE_CHAR_UUID = "1086fff1-3343-4817-8bb2-b32206336ce8"
NOTIFY_CHAR_UUID = "1086fff2-3343-4817-8bb2-b32206336ce8"
CELSIUS = "20010c2d"
FAHREN = "20010f30"

HANDSHAKE_COMMANDS = [
    bytes.fromhex("01098a7a13b73ed68b67c2a0"),
    bytes.fromhex("410041"),
    bytes.fromhex("28040a2d8c6e5d"),
    bytes.fromhex("20010f30"), # Initializes device in fahrenheit, change f30 to c2d for Celsius
    bytes.fromhex("23060200ffffffff27"),
    bytes.fromhex("23060400ffffffff29")
]

def notification_handler(sender, data):
    print("Notification from {sender}: {data.hex()}")

    hex_data = data.hex()
    probe1 = hex_data[14:18]
    probe2 = hex_data[22:26]

    def decimal_conversion(probe):
        if probe != 'ffff':
            return float(probe[:-1] + '.' + probe[-1])
        else:
            return probe

    print(f"Probe1 Temps: {decimal_conversion(probe1)}, Probe2 Temps: {decimal_conversion(probe2)}")

async def change_mode():
    async with BleakClient(DEVICE_ADDRESS) as client:
        print(f"Connecting to {DEVICE_ADDRESS}...")
        await client.write_gatt_char(WRITE_CHAR_UUID, FAHREN)
        print("Mode Changed.")

async def main():
    async with BleakClient(DEVICE_ADDRESS) as client:
        print("Connected to device")

        for i, cmd in enumerate(HANDSHAKE_COMMANDS, 1):
            print(f"Sending handshake {i}: {cmd.hex()}")
            await client.write_gatt_char(WRITE_CHAR_UUID, cmd)
            await asyncio.sleep(0.4) # Slight delay between writes

        print("Subscribing to notifications...")
        await client.start_notify(NOTIFY_CHAR_UUID, notification_handler)

        print("Listening for notifications. Press Ctrl+C to stop.")
        try:
            while True:
                await asyncio.sleep(1)
        except KeyboardInterrupt:
            print("Stopping...")

        await client.stop_notify(NOTIFY_CHAR_UUID)

asyncio.run(main())
asyncio.run(change_mode())