1 /*
2 * Copyright (C) 2018 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__ "scan_parameters_service_server.c"
39
40 /**
41 * Implementation of the Nordic SPP-like profile
42 *
43 * To use with your application, add `#import <scan_parameters_service.gatt>` to your .gatt file
44 * and call all functions below. All strings and blobs need to stay valid after calling the functions.
45 */
46
47 #include <stdint.h>
48 #include <string.h>
49
50 #ifdef ENABLE_TESTING_SUPPORT
51 #include <stdio.h>
52 #endif
53
54 #include "btstack_defines.h"
55 #include "ble/att_db.h"
56 #include "ble/att_server.h"
57 #include "btstack_util.h"
58 #include "bluetooth_gatt.h"
59 #include "btstack_debug.h"
60
61 #include "ble/gatt-service/scan_parameters_service_server.h"
62
63 static btstack_packet_handler_t scan_parameters_packet_handler;
64 static btstack_context_callback_registration_t scan_parameters_callback;
65 static att_service_handler_t scan_parameters_service;
66
67 static uint16_t scan_interval_window_value_handle;
68 static uint16_t scan_interval_window_value_handle_client_configuration;
69
70
71 static uint16_t scan_refresh_value_client_configuration;
72 static hci_con_handle_t scan_refresh_value_client_configuration_connection;
73
74 static uint16_t scan_refresh_value_handle;
75 static uint16_t scan_refresh_value_handle_client_configuration;
76
scan_parameters_service_emit_state(hci_con_handle_t con_handle,uint16_t max_scan_interval,uint16_t min_scan_window)77 static void scan_parameters_service_emit_state(hci_con_handle_t con_handle, uint16_t max_scan_interval, uint16_t min_scan_window){
78 if (scan_parameters_packet_handler == NULL) return;
79
80 uint8_t event[9];
81 uint16_t pos = 0;
82 event[pos++] = HCI_EVENT_GATTSERVICE_META;
83 event[pos++] = sizeof(event) - 2;
84 event[pos++] = GATTSERVICE_SUBEVENT_SCAN_PARAMETERS_SERVICE_SCAN_INTERVAL_UPDATE;
85 little_endian_store_16(event, pos, (uint16_t) con_handle);
86 pos += 2;
87 little_endian_store_16(event, pos, max_scan_interval);
88 pos += 2;
89 little_endian_store_16(event, pos, min_scan_window);
90 pos += 2;
91
92 (*scan_parameters_packet_handler)(HCI_EVENT_GATTSERVICE_META, 0, event, pos);
93 }
94
scan_parameters_service_read_callback(hci_con_handle_t con_handle,uint16_t attribute_handle,uint16_t offset,uint8_t * buffer,uint16_t buffer_size)95 static uint16_t scan_parameters_service_read_callback(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){
96 UNUSED(con_handle);
97 UNUSED(attribute_handle);
98 UNUSED(offset);
99 UNUSED(buffer);
100 UNUSED(buffer_size);
101 if (attribute_handle == scan_refresh_value_handle_client_configuration){
102 if (buffer != NULL){
103 little_endian_store_16(buffer, 0, scan_refresh_value_client_configuration);
104 }
105 return 2;
106 }
107 return 0;
108 }
109
scan_parameters_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)110 static int scan_parameters_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){
111 UNUSED(offset);
112 UNUSED(buffer_size);
113
114 if (transaction_mode != ATT_TRANSACTION_MODE_NONE){
115 return 0;
116 }
117
118 if (attribute_handle == scan_interval_window_value_handle){
119 if (buffer_size == 4){
120 uint16_t max_scan_interval = little_endian_read_16(buffer, 0);
121 uint16_t min_scan_window = little_endian_read_16(buffer, 2);
122 scan_parameters_service_emit_state(con_handle, max_scan_interval, min_scan_window);
123 return ATT_ERROR_SUCCESS;
124 } else {
125 return ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH;
126 }
127 }
128
129 if (attribute_handle == scan_refresh_value_handle_client_configuration){
130 if (buffer_size == 2){
131 scan_refresh_value_client_configuration = little_endian_read_16(buffer, 0);
132 scan_refresh_value_client_configuration_connection = con_handle;
133 return ATT_ERROR_SUCCESS;
134 } else {
135 return ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LENGTH;
136 }
137 }
138
139 return ATT_ERROR_UNLIKELY_ERROR;
140 }
141
scan_parameters_service_refresh_can_send_now(void * context)142 static void scan_parameters_service_refresh_can_send_now(void * context){
143 UNUSED(context);
144 const uint8_t value = 0;
145 att_server_notify(scan_refresh_value_client_configuration_connection, scan_refresh_value_handle, &value, 1);
146 }
147
148 /**
149 * @brief Init Nordic SPP Service Server with ATT DB
150 * @param callback for tx data from peer
151 */
scan_parameters_service_server_init(btstack_packet_handler_t packet_handler)152 void scan_parameters_service_server_init(btstack_packet_handler_t packet_handler){
153 scan_parameters_packet_handler = packet_handler;
154
155 // get service handle range
156 uint16_t start_handle = 0;
157 uint16_t end_handle = 0xffff;
158 int service_found = gatt_server_get_handle_range_for_service_with_uuid16(ORG_BLUETOOTH_SERVICE_SCAN_PARAMETERS, &start_handle, &end_handle);
159 btstack_assert(service_found != 0);
160 UNUSED(service_found);
161
162 // get characteristic value handle and client configuration handle
163 scan_interval_window_value_handle = gatt_server_get_value_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_SCAN_INTERVAL_WINDOW);
164 scan_interval_window_value_handle_client_configuration = gatt_server_get_client_configuration_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_SCAN_INTERVAL_WINDOW);
165
166 scan_refresh_value_handle = gatt_server_get_value_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_SCAN_REFRESH);
167 scan_refresh_value_handle_client_configuration = gatt_server_get_client_configuration_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_SCAN_REFRESH);
168
169 // register service with ATT Server
170 scan_parameters_service.start_handle = start_handle;
171 scan_parameters_service.end_handle = end_handle;
172 scan_parameters_service.read_callback = &scan_parameters_service_read_callback;
173 scan_parameters_service.write_callback = &scan_parameters_service_write_callback;
174 att_server_register_service_handler(&scan_parameters_service);
175 }
176
177
scan_parameters_service_server_request_scan_parameters(void)178 void scan_parameters_service_server_request_scan_parameters(void){
179 if (scan_refresh_value_client_configuration != 0){
180 scan_parameters_callback.callback = &scan_parameters_service_refresh_can_send_now;
181 scan_parameters_callback.context = NULL;
182 att_server_register_can_send_now_callback(&scan_parameters_callback, scan_refresh_value_client_configuration_connection);
183 }
184 }
185