Cheap BLE Lights demo (magic string and UUID based on sniff via Bluefruit using Wireshark

bleledpos.py

import asyncio
import time
import copy
import random
from bleak import discover, BleakClient

async def _discoverDevices():
    devices = await discover()
    return devices

def _findLights(name):
    print('Looking for BLE device')
    loop = asyncio.get_event_loop()
    devices = loop.run_until_complete(_discoverDevices())

    for d in devices:
        if d.name == name:
            print(f'Found {d.address}')
            return d.address
    return None    

def _getMagicString(r,g,b):
    hexstr = '7eff0503' + '{:02x}'.format(r) +'{:02x}'.format(g) +'{:02x}'.format(b) +'ffef'
    return hexstr

async def _doPattern(address,n):
    try:
        async with BleakClient(address) as client:
            if n ==1:    
                while True:    
                    command = _getMagicString(random.randint(0,255),random.randint(0,255),random.randint(0,255))
                    await client.write_gatt_char("0000ffe1-0000-1000-8000-00805f9b34fb", bytes.fromhex(command))
                    time.sleep(0.5)
            else:
                await client.write_gatt_char("0000ffe1-0000-1000-8000-00805f9b34fb", bytes.fromhex(_getMagicString(0,0,0)))
                time.sleep(1.5)
                await client.write_gatt_char("0000ffe1-0000-1000-8000-00805f9b34fb", bytes.fromhex(_getMagicString(255,0,0)))
                time.sleep(1.5)
                await client.write_gatt_char("0000ffe1-0000-1000-8000-00805f9b34fb", bytes.fromhex(_getMagicString(0,255,0)))
                time.sleep(1.5)
                await client.write_gatt_char("0000ffe1-0000-1000-8000-00805f9b34fb", bytes.fromhex(_getMagicString(0,0,255)))
    except:
        print("Send failed")

mac = _findLights("LEDBLE-0D5356")
if mac:
    loop = asyncio.get_event_loop()

    print("Starting test pattern")
    loop.run_until_complete(_doPattern(mac,2))

    print("Starting random pattern")
    loop.run_until_complete(_doPattern(mac,1))

else:
    print('Unable to find device')