1# Copyright 2021-2022 Google LLC 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# https://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14 15# ----------------------------------------------------------------------------- 16# Imports 17# ----------------------------------------------------------------------------- 18import asyncio 19import sys 20import os 21import logging 22from bumble.colors import color 23from bumble.device import Device 24from bumble.transport import open_transport 25from bumble.profiles.heart_rate_service import HeartRateServiceProxy 26 27 28# ----------------------------------------------------------------------------- 29async def main(): 30 if len(sys.argv) != 3: 31 print('Usage: heart_rate_client.py <transport-spec> <bluetooth-address>') 32 print('example: heart_rate_client.py usb:0 E1:CA:72:48:C4:E8') 33 return 34 35 print('<<< connecting to HCI...') 36 async with await open_transport(sys.argv[1]) as (hci_source, hci_sink): 37 print('<<< connected') 38 39 # Create and start a device 40 device = Device.with_hci('Bumble', 'F0:F1:F2:F3:F4:F5', hci_source, hci_sink) 41 await device.power_on() 42 43 # Connect to the peer 44 target_address = sys.argv[2] 45 print(f'=== Connecting to {target_address}...') 46 async with device.connect_as_gatt(target_address) as peer: 47 print(f'=== Connected to {peer}') 48 49 heart_rate_service = peer.create_service_proxy(HeartRateServiceProxy) 50 51 # Check that the service was found 52 if not heart_rate_service: 53 print('!!! Service not found') 54 return 55 56 # Read the body sensor location 57 if heart_rate_service.body_sensor_location: 58 location = await heart_rate_service.body_sensor_location.read_value() 59 print(color('Sensor Location:', 'green'), location) 60 61 # Subscribe to the heart rate measurement 62 if heart_rate_service.heart_rate_measurement: 63 await heart_rate_service.heart_rate_measurement.subscribe( 64 lambda value: print( 65 f'{color("Heart Rate Measurement:", "green")} {value}' 66 ) 67 ) 68 69 await peer.sustain() 70 71 72# ----------------------------------------------------------------------------- 73logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper()) 74asyncio.run(main()) 75