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 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 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 } 109 110 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 } 141 142 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 */ 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 } 176 177 178 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