1 /*
2 * Copyright (C) 2014 BlueKitchen GmbH
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the copyright holders nor the names of
14 * contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * 4. Any redistribution, use, or modification is done solely for
17 * personal benefit and not for any commercial purpose or for
18 * monetary gain.
19 *
20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * Please inquire about commercial licensing options at
34 * [email protected]
35 *
36 */
37
38 #define BTSTACK_FILE__ "battery_service_server.c"
39
40 /**
41 * Implementation of the GATT Battery Service Server
42 * To use with your application, add `#import <battery_service.gatt>` to your .gatt file
43 */
44
45 #include "btstack_defines.h"
46 #include "ble/att_db.h"
47 #include "ble/att_server.h"
48 #include "btstack_util.h"
49 #include "bluetooth_gatt.h"
50 #include "btstack_debug.h"
51
52
53 #include "ble/gatt-service/battery_service_server.h"
54
55 static btstack_context_callback_registration_t battery_callback;
56 static att_service_handler_t battery_service;
57
58 static uint8_t battery_value;
59 static uint16_t battery_value_client_configuration;
60 static hci_con_handle_t battery_value_client_configuration_connection;
61
62 static uint16_t battery_value_handle;
63 static uint16_t battery_value_client_configuration_handle;
64
65
battery_service_read_callback(hci_con_handle_t con_handle,uint16_t attribute_handle,uint16_t offset,uint8_t * buffer,uint16_t buffer_size)66 static uint16_t battery_service_read_callback(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){
67 UNUSED(con_handle);
68
69 if (attribute_handle == battery_value_handle){
70 return att_read_callback_handle_byte(battery_value, offset, buffer, buffer_size);
71 }
72 if (attribute_handle == battery_value_client_configuration_handle){
73 return att_read_callback_handle_little_endian_16(battery_value_client_configuration, offset, buffer, buffer_size);
74 }
75 return 0;
76 }
77
battery_service_write_callback(hci_con_handle_t con_handle,uint16_t attribute_handle,uint16_t transaction_mode,uint16_t offset,uint8_t * buffer,uint16_t buffer_size)78 static int battery_service_write_callback(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size){
79 UNUSED(offset);
80 UNUSED(buffer_size);
81
82 if (transaction_mode != ATT_TRANSACTION_MODE_NONE){
83 return 0;
84 }
85
86 if (attribute_handle == battery_value_client_configuration_handle){
87 battery_value_client_configuration = little_endian_read_16(buffer, 0);
88 battery_value_client_configuration_connection = con_handle;
89 }
90 return 0;
91 }
92
battery_service_can_send_now(void * context)93 static void battery_service_can_send_now(void * context){
94 hci_con_handle_t con_handle = (hci_con_handle_t) (uintptr_t) context;
95 att_server_notify(con_handle, battery_value_handle, &battery_value, 1);
96 }
97
battery_service_server_init(uint8_t value)98 void battery_service_server_init(uint8_t value){
99
100 battery_value = value;
101
102 // get service handle range
103 uint16_t start_handle = 0;
104 uint16_t end_handle = 0xffff;
105 int service_found = gatt_server_get_handle_range_for_service_with_uuid16(ORG_BLUETOOTH_SERVICE_BATTERY_SERVICE, &start_handle, &end_handle);
106 btstack_assert(service_found != 0);
107 UNUSED(service_found);
108
109 // get characteristic value handle and client configuration handle
110 battery_value_handle = gatt_server_get_value_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_BATTERY_LEVEL);
111 battery_value_client_configuration_handle = gatt_server_get_client_configuration_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_BATTERY_LEVEL);
112
113 // register service with ATT Server
114 battery_service.start_handle = start_handle;
115 battery_service.end_handle = end_handle;
116 battery_service.read_callback = &battery_service_read_callback;
117 battery_service.write_callback = &battery_service_write_callback;
118 att_server_register_service_handler(&battery_service);
119 }
120
battery_service_server_set_battery_value(uint8_t value)121 void battery_service_server_set_battery_value(uint8_t value){
122 battery_value = value;
123 if (battery_value_client_configuration != 0){
124 battery_callback.callback = &battery_service_can_send_now;
125 battery_callback.context = (void*) (uintptr_t) battery_value_client_configuration_connection;
126 att_server_register_can_send_now_callback(&battery_callback, battery_value_client_configuration_connection);
127 }
128 }
129