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Custom CircuitPython BLE Service
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| import board | |
| import os | |
| import time | |
| from adafruit_ble import Service | |
| from adafruit_ble import BLERadio | |
| from adafruit_ble.advertising import Advertisement | |
| from adafruit_ble.advertising.standard import ProvideServicesAdvertisement | |
| 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 = BLERadio() | |
| gBLE.name = "Countdown Clock BLE" | |
| gService = CountdownClockService() | |
| gAdv = ProvideServicesAdvertisement(gService) | |
| #gAdv = Advertisement() | |
| gAdv.short_name = "ClockSvc" | |
| def BLETask(): | |
| gBLE.stop_advertising() | |
| while True: | |
| gBLE.start_advertising(gAdv) | |
| print("Advertising") | |
| while not gBLE.connected: | |
| time.sleep(0.100) | |
| pass | |
| print("Stopping Advertising") | |
| gBLE.stop_advertising() | |
| while gBLE.connected: | |
| print("BLE connected") | |
| cs = gService.countdownStart | |
| if cs is not None: | |
| print(f"countdown start is { cs }") | |
| time.sleep(0.500) | |
| while True: | |
| BLETask() | |
| print("main exited") |
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