Created
August 30, 2024 22:32
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CP BLE Central for Countdown Clock
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| import _bleio | |
| import adafruit_ble | |
| from adafruit_ble.advertising.standard import Advertisement | |
| from adafruit_ble.services.standard.device_info import DeviceInfoService | |
| from adafruit_ble import Service | |
| from adafruit_ble.characteristics import Characteristic | |
| from adafruit_ble.characteristics.int import Uint16Characteristic | |
| from adafruit_ble.uuid import VendorUUID | |
| class CountdownClockService(Service): | |
| """Countdown Clock Service""" | |
| uuid = VendorUUID("F1B8ED4E-648B-4689-8A0C-4930BC3A2325") | |
| countdownStart = Uint16Characteristic(max_value = 9 * 60 + 59, | |
| uuid = VendorUUID("955CB941-F229-4AAB-81FB-44349AFB6CA7"), | |
| properties = Characteristic.WRITE | Characteristic.READ) | |
| def __init__( | |
| self, | |
| countdownStart = 10 | |
| ) -> None: | |
| super().__init__( | |
| manufacturer = "Latency: Zero, LLC", | |
| software_revision = "1.0", | |
| model_number = "CC", | |
| serial_number = "12345", | |
| firmware_revision = "1.0", | |
| hardware_revision = "1.0", | |
| ) | |
| gBLE = adafruit_ble.BLERadio() | |
| gConnection = None | |
| while True: | |
| print("Scanning...") | |
| for adv in gBLE.start_scan(Advertisement, timeout=5): | |
| name = adv.complete_name | |
| if name == "Countdown Clock BLE": | |
| print(f"Found device: { name }") | |
| gConnection = gBLE.connect(adv) | |
| break | |
| gBLE.stop_scan() | |
| try: | |
| if gConnection and gConnection.connected: | |
| print("Connected") | |
| if DeviceInfoService in gConnection: | |
| dis = gConnection[DeviceInfoService] | |
| print(f"Man: { dis.manufacturer }") | |
| else: | |
| print("No device info") | |
| service = gConnection[CountdownClockService] | |
| service.countdownStart = 25 | |
| print("Wrote countdown start, exting") | |
| break | |
| except ConnectionError: | |
| try: | |
| gConnection.disconnect() | |
| except ConnectionError: | |
| pass | |
| gConnection = None |
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