212 lines
8.4 KiB
Python
212 lines
8.4 KiB
Python
# Copyright 2021-2022 Google LLC
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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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# https://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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# -----------------------------------------------------------------------------
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# Imports
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# -----------------------------------------------------------------------------
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import asyncio
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import os
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import logging
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import click
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from colors import color
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from bumble.device import Device, Peer
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from bumble.core import AdvertisingData
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from bumble.gatt import Service, Characteristic
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from bumble.utils import AsyncRunner
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from bumble.transport import open_transport_or_link
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from bumble.hci import HCI_Constant
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# -----------------------------------------------------------------------------
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# Constants
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# -----------------------------------------------------------------------------
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GG_GATTLINK_SERVICE_UUID = 'ABBAFF00-E56A-484C-B832-8B17CF6CBFE8'
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GG_GATTLINK_RX_CHARACTERISTIC_UUID = 'ABBAFF01-E56A-484C-B832-8B17CF6CBFE8'
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GG_GATTLINK_TX_CHARACTERISTIC_UUID = 'ABBAFF02-E56A-484C-B832-8B17CF6CBFE8'
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GG_GATTLINK_L2CAP_CHANNEL_PSM_CHARACTERISTIC_UUID = 'ABBAFF03-E56A-484C-B832-8B17CF6CBFE8'
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GG_PREFERRED_MTU = 256
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# -----------------------------------------------------------------------------
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class GattlinkHubBridge(Device.Listener):
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def __init__(self):
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self.peer = None
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self.rx_socket = None
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self.tx_socket = None
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self.rx_characteristic = None
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self.tx_characteristic = None
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@AsyncRunner.run_in_task()
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async def on_connection(self, connection):
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print(f'=== Connected to {connection}')
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self.peer = Peer(connection)
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# Request a larger MTU than the default
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server_mtu = await self.peer.request_mtu(GG_PREFERRED_MTU)
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print(f'### Server MTU = {server_mtu}')
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# Discover all services
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print(color('=== Discovering services', 'yellow'))
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await self.peer.discover_service(GG_GATTLINK_SERVICE_UUID)
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print(color('=== Services discovered', 'yellow'), self.peer.services)
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for service in self.peer.services:
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print(service)
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services = self.peer.get_services_by_uuid(GG_GATTLINK_SERVICE_UUID)
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if not services:
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print(color('!!! Gattlink service not found', 'red'))
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return
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# Use the first Gattlink (there should only be one anyway)
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gattlink_service = services[0]
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# Discover all the characteristics for the service
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characteristics = await gattlink_service.discover_characteristics()
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print(color('=== Characteristics discovered', 'yellow'))
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for characteristic in characteristics:
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if characteristic.uuid == GG_GATTLINK_RX_CHARACTERISTIC_UUID:
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self.rx_characteristic = characteristic
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elif characteristic.uuid == GG_GATTLINK_TX_CHARACTERISTIC_UUID:
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self.tx_characteristic = characteristic
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print('RX:', self.rx_characteristic)
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print('TX:', self.tx_characteristic)
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# Subscribe to TX
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if self.tx_characteristic:
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await self.peer.subscribe(self.tx_characteristic, self.on_tx_received)
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print(color('=== Subscribed to Gattlink TX', 'yellow'))
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else:
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print(color('!!! Gattlink TX not found', 'red'))
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def on_connection_failure(self, error):
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print(color(f'!!! Connection failed: {error}'))
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def on_disconnection(self, reason):
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print(color(f'!!! Disconnected from {self.peer}, reason={HCI_Constant.error_name(reason)}', 'red'))
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self.tx_characteristic = None
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self.rx_characteristic = None
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self.peer = None
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# Called by the GATT client when a notification is received
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def on_tx_received(self, value):
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print(color('>>> TX:', 'magenta'), value.hex())
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if self.tx_socket:
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self.tx_socket.sendto(value)
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# Called by asyncio when the UDP socket is created
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def connection_made(self, transport):
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pass
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# Called by asyncio when a UDP datagram is received
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def datagram_received(self, data, address):
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print(color('<<< RX:', 'magenta'), data.hex())
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# TODO: use a queue instead of creating a task everytime
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if self.peer and self.rx_characteristic:
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asyncio.create_task(self.peer.write_value(self.rx_characteristic, data))
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# -----------------------------------------------------------------------------
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class GattlinkNodeBridge(Device.Listener):
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def __init__(self):
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self.peer = None
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self.rx_socket = None
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self.tx_socket = None
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# Called by asyncio when the UDP socket is created
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def connection_made(self, transport):
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pass
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# Called by asyncio when a UDP datagram is received
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def datagram_received(self, data, address):
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print(color('<<< RX:', 'magenta'), data.hex())
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# TODO: use a queue instead of creating a task everytime
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if self.peer and self.rx_characteristic:
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asyncio.create_task(self.peer.write_value(self.rx_characteristic, data))
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# -----------------------------------------------------------------------------
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async def run(hci_transport, device_address, send_host, send_port, receive_host, receive_port):
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print('<<< connecting to HCI...')
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async with await open_transport_or_link(hci_transport) as (hci_source, hci_sink):
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print('<<< connected')
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# Instantiate a bridge object
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bridge = GattlinkNodeBridge()
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# Create a UDP to RX bridge (receive from UDP, send to RX)
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loop = asyncio.get_running_loop()
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await loop.create_datagram_endpoint(
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lambda: bridge,
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local_addr=(receive_host, receive_port)
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)
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# Create a UDP to TX bridge (receive from TX, send to UDP)
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bridge.tx_socket, _ = await loop.create_datagram_endpoint(
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lambda: asyncio.DatagramProtocol(),
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remote_addr=(send_host, send_port)
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)
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# Create a device to manage the host, with a custom listener
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device = Device.with_hci('Bumble', 'F0:F1:F2:F3:F4:F5', hci_source, hci_sink)
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device.listener = bridge
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await device.power_on()
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# Connect to the peer
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# print(f'=== Connecting to {device_address}...')
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# await device.connect(device_address)
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# TODO move to class
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gattlink_service = Service(
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GG_GATTLINK_SERVICE_UUID,
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[
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Characteristic(
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GG_GATTLINK_L2CAP_CHANNEL_PSM_CHARACTERISTIC_UUID,
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Characteristic.READ,
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Characteristic.READABLE,
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bytes([193, 0])
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)
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]
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)
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device.add_services([gattlink_service])
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device.advertising_data = bytes(
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AdvertisingData([
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(AdvertisingData.COMPLETE_LOCAL_NAME, bytes('Bumble GG', 'utf-8')),
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(AdvertisingData.INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS, bytes(reversed(bytes.fromhex('ABBAFF00E56A484CB8328B17CF6CBFE8'))))
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])
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)
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await device.start_advertising()
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# Wait until the source terminates
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await hci_source.wait_for_termination()
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@click.command()
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@click.argument('hci_transport')
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@click.argument('device_address')
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@click.option('-sh', '--send-host', type=str, default='127.0.0.1', help='UDP host to send to')
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@click.option('-sp', '--send-port', type=int, default=9001, help='UDP port to send to')
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@click.option('-rh', '--receive-host', type=str, default='127.0.0.1', help='UDP host to receive on')
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@click.option('-rp', '--receive-port', type=int, default=9000, help='UDP port to receive on')
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def main(hci_transport, device_address, send_host, send_port, receive_host, receive_port):
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logging.basicConfig(level = os.environ.get('BUMBLE_LOGLEVEL', 'INFO').upper())
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asyncio.run(run(hci_transport, device_address, send_host, send_port, receive_host, receive_port))
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# -----------------------------------------------------------------------------
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if __name__ == '__main__':
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main()
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