add support for the heart rate service

examples/heart_rate_server.py

@@ -0,0 +1,95 @@
+# Copyright 2021-2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# -----------------------------------------------------------------------------
+# Imports
+# -----------------------------------------------------------------------------
+import sys
+import time
+import math
+import random
+import struct
+import logging
+import asyncio
+import os
+
+from bumble.core import AdvertisingData
+from bumble.device import Device
+from bumble.transport import open_transport_or_link
+from bumble.profiles.device_information_service import DeviceInformationService
+from bumble.profiles.heart_rate_service import HeartRateService
+
+
+# -----------------------------------------------------------------------------
+async def main():
+    if len(sys.argv) != 3:
+        print('Usage: python heart_rate_server.py <device-config> <transport-spec>')
+        print('example: python heart_rate_server.py device1.json usb:0')
+        return
+
+    async with await open_transport_or_link(sys.argv[2]) as (hci_source, hci_sink):
+        device = Device.from_config_file_with_hci(sys.argv[1], hci_source, hci_sink)
+
+        # Keep track of accumulated expended energy
+        energy_start_time = time.time()
+
+        def reset_energy_expended():
+            nonlocal energy_start_time
+            energy_start_time = time.time()
+
+        # Add a Device Information Service and Heart Rate Service to the GATT sever
+        device_information_service = DeviceInformationService(
+            manufacturer_name = 'ACME',
+            model_number      = 'HR-102',
+            serial_number     = '7654321',
+            hardware_revision = '1.1.3',
+            software_revision = '2.5.6',
+            system_id         = (0x123456, 0x8877665544)
+        )
+
+        heart_rate_service = HeartRateService(
+            read_heart_rate_measurement = lambda _: HeartRateService.HeartRateMeasurement(
+                heart_rate              = 100 + int(50 * math.sin(time.time() * math.pi / 60)),
+                sensor_contact_detected = random.choice((True, False, None)),
+                energy_expended         = random.choice((int((time.time() - energy_start_time) * 100), None)),
+                rr_intervals            = random.choice(((random.randint(900, 1100) / 1000, random.randint(900, 1100) / 1000), None))
+            ),
+            body_sensor_location=HeartRateService.BodySensorLocation.WRIST,
+            reset_energy_expended=lambda _: reset_energy_expended()
+        )
+
+        device.add_services([device_information_service, heart_rate_service])
+
+        # Set the advertising data
+        device.advertising_data = bytes(
+            AdvertisingData([
+                (AdvertisingData.COMPLETE_LOCAL_NAME, bytes('Bumble Heart', 'utf-8')),
+                (AdvertisingData.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS, bytes(heart_rate_service.uuid)),
+                (AdvertisingData.APPEARANCE, struct.pack('<H', 0x0340))
+            ])
+        )
+
+        # Go!
+        await device.power_on()
+        await device.start_advertising(auto_restart=True)
+
+        # Notify every 3 seconds
+        while True:
+            await asyncio.sleep(3.0)
+            await device.notify_subscribers(heart_rate_service.heart_rate_measurement_characteristic)
+
+
+# -----------------------------------------------------------------------------
+logging.basicConfig(level = os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
+asyncio.run(main())