add support for type adapters and framework for adding standard GATT profiles

examples/battery_server.py

@@ -0,0 +1,66 @@
+# 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 asyncio
+import sys
+import os
+import logging
+import random
+import struct
+
+from bumble.core import AdvertisingData
+from bumble.device import Device
+from bumble.transport import open_transport_or_link
+from bumble.profiles.battery_service import BatteryService
+
+
+# -----------------------------------------------------------------------------
+async def main():
+    if len(sys.argv) != 3:
+        print('Usage: python battery_server.py <device-config> <transport-spec>')
+        print('example: python battery_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)
+
+        # Add a Device Information Service and Battery Service to the GATT sever
+        battery_service = BatteryService(lambda _: random.randint(0, 100))
+        device.add_service(battery_service)
+
+        # Set the advertising data
+        device.advertising_data = bytes(
+            AdvertisingData([
+                (AdvertisingData.COMPLETE_LOCAL_NAME, bytes('Bumble Battery', 'utf-8')),
+                (AdvertisingData.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS, bytes(battery_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(battery_service.battery_level_characteristic)
+
+
+# -----------------------------------------------------------------------------
+logging.basicConfig(level = os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
+asyncio.run(main())