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64 lines
2.2 KiB
Python
64 lines
2.2 KiB
Python
"""Turn the alert on Mi Band device
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"""
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from kivy.app import App
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from kivy.uix.button import Button
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from able import BluetoothDispatcher, GATT_SUCCESS
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from error_message import install_exception_handler
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class BLE(BluetoothDispatcher):
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device = alert_characteristic = None
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def start_alert(self, *args, **kwargs):
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if self.alert_characteristic: # alert service is already discovered
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self.alert(self.alert_characteristic)
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elif self.device: # device is already founded during the scan
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self.connect_gatt(self.device) # reconnect
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else:
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self.stop_scan() # stop previous scan
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self.start_scan() # start a scan for devices
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def on_device(self, device, rssi, advertisement):
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# some device is found during the scan
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name = device.getName()
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if name and name.startswith('MI'): # is a Mi Band device
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self.device = device
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self.stop_scan()
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def on_scan_completed(self):
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if self.device:
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self.connect_gatt(self.device) # connect to device
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def on_connection_state_change(self, status, state):
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if status == GATT_SUCCESS and state: # connection established
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self.discover_services() # discover what services a device offer
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else: # disconnection or error
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self.alert_characteristic = None
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self.close_gatt() # close current connection
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def on_services(self, status, services):
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# 0x2a06 is a standard code for "Alert Level" characteristic
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# https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.characteristic.alert_level.xml
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self.alert_characteristic = services.search('2a06')
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self.alert(self.alert_characteristic)
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def alert(self, characteristic):
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self.write_characteristic(characteristic, [2]) # 2 is for "High Alert"
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class AlertApp(App):
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def build(self):
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self.ble = None
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return Button(text='Press to Alert Mi', on_press=self.start_alert)
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def start_alert(self, *args, **kwargs):
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if not self.ble:
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self.ble = BLE()
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self.ble.start_alert()
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if __name__ == '__main__':
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install_exception_handler()
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AlertApp().run()
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