45 lines
1.7 KiB
Python
45 lines
1.7 KiB
Python
import asyncio
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import typing
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import bleak
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class BleConnection:
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# See https://learn.adafruit.com/introducing-adafruit-ble-bluetooth-low-energy-friend/uart-service
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ble_uuid = "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"
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adafruit_rx_uuid = "6E400003-B5A3-F393-E0A9-E50E24DCCA9E"
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adafruit_tx_uuid = "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
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ble_name = "Adafruit Bluefruit LE"
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def __init__(self, receive_handler: typing.Callable[[bytes], None],
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connected_handler: typing.Callable[[], None]):
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self.ble_client : bleak.BleakClient = None
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self.receive_handler = receive_handler
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self.connected_handler = connected_handler
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def _uart_handler(self, _, data: bytes):
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self.receive_handler(data)
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async def connect(self):
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print("Scanning for devices...")
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devices = await bleak.BleakScanner.discover(service_uuids=[self.ble_uuid])
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print(f"Found {len(devices)} devices")
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print([device.name for device in devices])
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ble_device_info = [device for device in devices if device.name==self.ble_name][0]
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print("Connecting to {}...".format(ble_device_info.name))
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async with bleak.BleakClient(ble_device_info.address) as ble_client:
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self.ble_client = ble_client
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self.connected_handler()
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print("Connected to {}".format(ble_device_info.name))
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asyncio.create_task(
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self.ble_client.start_notify(self.adafruit_rx_uuid, self._uart_handler)
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)
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while True:
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await asyncio.sleep(1)
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def send_uart_data(self, data: bytes):
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if self.ble_client:
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asyncio.create_task(
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self.ble_client.write_gatt_char(self.adafruit_tx_uuid, data)
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)
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