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# Copyright 2019 Virantha N. Ekanayake |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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"""Interface to the BLEAK library in Linux for BLE calls |
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""" |
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import curio, asyncio, threading, logging |
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import bleak |
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#from bleak import BleakClient |
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View Code Duplication |
class Bleak: |
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"""Interface class between curio loop and asyncio loop running bleak |
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This class is basically just a queue interface. It has two queue, |
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one for incoming messages `in_queue` and one for outgoing messages `out_queue`. |
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A loop running in asyncio's event_loop waits for messages on the `in_queue`. |
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The `out_queue` is used to respond to "discover" and "connect" messages with the |
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list of discovered devices and a connected device respectively. All messages |
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incoming from a device are relayed directly to a call back function, and does |
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not go through either of these queues. |
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""" |
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def __init__(self): |
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# Need to start an event loop |
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self.in_queue = curio.UniversalQueue() # Incoming message queue |
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self.out_queue = curio.UniversalQueue() # Outgoing message queue |
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self.devices = [] |
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#self.loop = threading.Thread(target=self.run, daemon=True) |
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#self.loop.start() |
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def run(self): |
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#self.loop = asyncio.new_event_loop() |
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#asyncio.set_event_loop(self.loop) |
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self.loop = asyncio.get_event_loop() |
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self.loop.run_until_complete(self.asyncio_loop()) |
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async def asyncio_loop(self): |
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# Wait for messages on in_queue |
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done = False |
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while not done: |
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msg = await self.in_queue.get() |
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if isinstance(msg, tuple): |
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msg, val = msg |
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await self.in_queue.task_done() |
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if msg == 'discover': |
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print('Awaiting on bleak discover') |
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devices = await bleak.discover(timeout=1, loop=self.loop) |
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print('Done Awaiting on bleak discover') |
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await self.out_queue.put(devices) |
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elif msg == 'connect': |
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device = bleak.BleakClient(address=val, loop=self.loop) |
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self.devices.append(device) |
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await device.connect() |
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await self.out_queue.put(device) |
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elif msg == 'tx': |
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device, char_uuid, msg_bytes = val |
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await device.write_gatt_char(char_uuid, msg_bytes) |
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elif msg == 'notify': |
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device, char_uuid, msg_handler = val |
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await device.start_notify(char_uuid, msg_handler) |
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elif msg =='quit': |
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print("quitting") |
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logging.info('quitting') |
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for device in self.devices: |
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await device.disconnect() |
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done = True |
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print("quit") |
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else: |
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print(f'Unknown message to Bleak: {msg}') |
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virantha /
bricknil
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