72 lines
2.2 KiB
Python
72 lines
2.2 KiB
Python
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"""Advertise battery level, that degrades every second."""
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from kivy.app import App
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from kivy.clock import Clock
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from kivy.uix.label import Label
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from able import BluetoothDispatcher
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from able import advertising
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# Standard fully-qualified UUID for the Battery Service
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BATTERY_SERVICE_UUID = "0000180f-0000-1000-8000-00805f9b34fb"
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class BatteryAdvertiser(advertising.Advertiser):
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def on_advertising_started(self, advertising_set, tx_power, status):
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if status == advertising.Status.SUCCESS:
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print("Advertising is started successfully")
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else:
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print(f"Advertising start error status: {status}")
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def on_advertising_stopped(self, advertising_set):
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print("Advertising stopped")
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class BatteryLabel(Label):
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"""Widget to control advertiser and show current battery level."""
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def __init__(self):
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self._level = 0
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super().__init__(text="Waiting for advertising to start...")
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self.advertiser = BatteryAdvertiser(
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ble=BluetoothDispatcher(),
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data=self.construct_data(level=100),
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interval=advertising.Interval.MIN
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)
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self.advertiser.bind(on_advertising_started=self.on_started) # bind to start of advertising
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self.advertiser.start()
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def on_started(self, advertiser, advertising_set, tx_power, status):
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if status == advertising.Status.SUCCESS:
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# Advertising is started - update battery level every second
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self.clock = Clock.schedule_interval(self.update_level, 1)
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def update_level(self, dt):
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level = self._level = (self._level - 1) % 101
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self.text = str(level)
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if level > 0:
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# Set new advertising data
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self.advertiser.data = self.construct_data(level)
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else:
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self.clock.cancel()
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# Stop advertising
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self.advertiser.stop()
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def construct_data(self, level):
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return advertising.AdvertiseData(
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advertising.DeviceName(),
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advertising.TXPowerLevel(),
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advertising.ServiceData(BATTERY_SERVICE_UUID, [level])
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)
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class BatteryApp(App):
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def build(self):
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return BatteryLabel()
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if __name__ == "__main__":
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BatteryApp().run()
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