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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 logging
19import struct
20
21from .gatt import (
22    Service,
23    Characteristic,
24    GATT_GENERIC_ACCESS_SERVICE,
25    GATT_DEVICE_NAME_CHARACTERISTIC,
26    GATT_APPEARANCE_CHARACTERISTIC,
27)
28
29# -----------------------------------------------------------------------------
30# Logging
31# -----------------------------------------------------------------------------
32logger = logging.getLogger(__name__)
33
34
35# -----------------------------------------------------------------------------
36# Classes
37# -----------------------------------------------------------------------------
38
39# -----------------------------------------------------------------------------
40class GenericAccessService(Service):
41    def __init__(self, device_name, appearance=(0, 0)):
42        device_name_characteristic = Characteristic(
43            GATT_DEVICE_NAME_CHARACTERISTIC,
44            Characteristic.READ,
45            Characteristic.READABLE,
46            device_name.encode('utf-8')[:248],
47        )
48
49        appearance_characteristic = Characteristic(
50            GATT_APPEARANCE_CHARACTERISTIC,
51            Characteristic.READ,
52            Characteristic.READABLE,
53            struct.pack('<H', (appearance[0] << 6) | appearance[1]),
54        )
55
56        super().__init__(
57            GATT_GENERIC_ACCESS_SERVICE,
58            [device_name_characteristic, appearance_characteristic],
59        )
60