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scripts: Add aio ble example.
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import sys
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sys.path.append("")
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from micropython import const
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import uasyncio as asyncio
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import aioble
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import bluetooth
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import random
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import struct
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# org.bluetooth.service.environmental_sensing
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_ENV_SENSE_UUID = bluetooth.UUID(0x181A)
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# org.bluetooth.characteristic.temperature
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_ENV_SENSE_TEMP_UUID = bluetooth.UUID(0x2A6E)
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# org.bluetooth.characteristic.gap.appearance.xml
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_ADV_APPEARANCE_GENERIC_THERMOMETER = const(768)
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# How frequently to send advertising beacons.
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_ADV_INTERVAL_MS = 250_000
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# Register GATT server.
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temp_service = aioble.Service(_ENV_SENSE_UUID)
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temp_characteristic = aioble.Characteristic(
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temp_service, _ENV_SENSE_TEMP_UUID, read=True, notify=True
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)
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aioble.register_services(temp_service)
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# Helper to encode the temperature characteristic encoding (sint16, hundredths of a degree).
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def _encode_temperature(temp_deg_c):
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return struct.pack("<h", int(temp_deg_c * 100))
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# This would be periodically polling a hardware sensor.
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async def sensor_task():
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t = 24.5
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while True:
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temp_characteristic.write(_encode_temperature(t))
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t += random.uniform(-0.5, 0.5)
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await asyncio.sleep_ms(1000)
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# Serially wait for connections. Don't advertise while a central is
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# connected.
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async def peripheral_task():
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while True:
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async with await aioble.advertise(
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_ADV_INTERVAL_MS,
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name="mpy-temp",
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services=[_ENV_SENSE_UUID],
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appearance=_ADV_APPEARANCE_GENERIC_THERMOMETER,
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) as connection:
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print("Connection from", connection.device)
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await connection.disconnected()
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# Run both tasks.
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async def main():
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t1 = asyncio.create_task(sensor_task())
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t2 = asyncio.create_task(peripheral_task())
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await asyncio.gather(t1, t2)
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asyncio.run(main())
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