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__ "nordic_spp_service_server.c" 39 40 /** 41 * Implementation of the Nordic SPP-like profile 42 * 43 * To use with your application, add `#import <nordic_spp_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 #include "btstack_defines.h" 51 #include "ble/att_db.h" 52 #include "ble/att_server.h" 53 #include "btstack_util.h" 54 #include "bluetooth_gatt.h" 55 #include "btstack_debug.h" 56 57 #include "ble/gatt-service/nordic_spp_service_server.h" 58 59 // 60 static att_service_handler_t nordic_spp_service; 61 static btstack_packet_handler_t client_packet_handler; 62 63 static uint16_t nordic_spp_rx_value_handle; 64 static uint16_t nordic_spp_tx_value_handle; 65 static uint16_t nordic_spp_tx_client_configuration_handle; 66 static uint16_t nordic_spp_tx_client_configuration_value; 67 68 static void nordic_spp_service_emit_state(hci_con_handle_t con_handle, bool enabled){ 69 uint8_t event[5]; 70 uint8_t pos = 0; 71 event[pos++] = HCI_EVENT_GATTSERVICE_META; 72 event[pos++] = sizeof(event) - 2; 73 event[pos++] = enabled ? GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED : GATTSERVICE_SUBEVENT_SPP_SERVICE_DISCONNECTED; 74 little_endian_store_16(event,pos, (uint16_t) con_handle); 75 pos += 2; 76 (*client_packet_handler)(HCI_EVENT_PACKET, 0, event, pos); 77 } 78 79 static uint16_t nordic_spp_service_read_callback(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){ 80 UNUSED(con_handle); 81 UNUSED(offset); 82 UNUSED(buffer_size); 83 84 if (attribute_handle == nordic_spp_tx_client_configuration_handle){ 85 if (buffer != NULL){ 86 little_endian_store_16(buffer, 0, nordic_spp_tx_client_configuration_value); 87 } 88 return 2; 89 } 90 return 0; 91 } 92 93 static int nordic_spp_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){ 94 UNUSED(offset); 95 UNUSED(buffer_size); 96 97 if (transaction_mode != ATT_TRANSACTION_MODE_NONE){ 98 return 0; 99 } 100 101 if (attribute_handle == nordic_spp_rx_value_handle){ 102 (*client_packet_handler)(RFCOMM_DATA_PACKET, (uint16_t) con_handle, buffer, buffer_size); 103 } 104 105 if (attribute_handle == nordic_spp_tx_client_configuration_handle){ 106 nordic_spp_tx_client_configuration_value = little_endian_read_16(buffer, 0); 107 bool enabled = (nordic_spp_tx_client_configuration_value != 0); 108 nordic_spp_service_emit_state(con_handle, enabled); 109 } 110 111 return 0; 112 } 113 114 /** 115 * @brief Init Nordic SPP Service Server with ATT DB 116 * @param callback for tx data from peer 117 */ 118 void nordic_spp_service_server_init(btstack_packet_handler_t packet_handler){ 119 120 static const uint8_t nordic_spp_profile_uuid128[] = { 0x6E, 0x40, 0x00, 0x01, 0xB5, 0xA3, 0xF3, 0x93, 0xE0, 0xA9, 0xE5, 0x0E, 0x24, 0xDC, 0xCA, 0x9E }; 121 static const uint8_t nordic_spp_rx_uuid128[] = { 0x6E, 0x40, 0x00, 0x02, 0xB5, 0xA3, 0xF3, 0x93, 0xE0, 0xA9, 0xE5, 0x0E, 0x24, 0xDC, 0xCA, 0x9E }; 122 static const uint8_t nordic_spp_tx_uuid128[] = { 0x6E, 0x40, 0x00, 0x03, 0xB5, 0xA3, 0xF3, 0x93, 0xE0, 0xA9, 0xE5, 0x0E, 0x24, 0xDC, 0xCA, 0x9E }; 123 124 client_packet_handler = packet_handler; 125 126 // get service handle range 127 uint16_t start_handle = 0; 128 uint16_t end_handle = 0xffff; 129 int service_found = gatt_server_get_handle_range_for_service_with_uuid128(nordic_spp_profile_uuid128, &start_handle, &end_handle); 130 btstack_assert(service_found != 0); 131 UNUSED(service_found); 132 133 // get characteristic value handle and client configuration handle 134 nordic_spp_rx_value_handle = gatt_server_get_value_handle_for_characteristic_with_uuid128(start_handle, end_handle, nordic_spp_rx_uuid128); 135 nordic_spp_tx_value_handle = gatt_server_get_value_handle_for_characteristic_with_uuid128(start_handle, end_handle, nordic_spp_tx_uuid128); 136 nordic_spp_tx_client_configuration_handle = gatt_server_get_client_configuration_handle_for_characteristic_with_uuid128(start_handle, end_handle, nordic_spp_tx_uuid128); 137 138 log_info("nordic_spp_rx_value_handle 0x%02x", nordic_spp_rx_value_handle); 139 log_info("nordic_spp_tx_value_handle 0x%02x", nordic_spp_tx_value_handle); 140 log_info("nordic_spp_tx_client_configuration_handle 0x%02x", nordic_spp_tx_client_configuration_handle); 141 142 // register service with ATT Server 143 nordic_spp_service.start_handle = start_handle; 144 nordic_spp_service.end_handle = end_handle; 145 nordic_spp_service.read_callback = &nordic_spp_service_read_callback; 146 nordic_spp_service.write_callback = &nordic_spp_service_write_callback; 147 att_server_register_service_handler(&nordic_spp_service); 148 } 149 150 /** 151 * @brief Queue send request. When called, one packet can be send via nordic_spp_service_send below 152 * @param request 153 * @param con_handle 154 */ 155 void nordic_spp_service_server_request_can_send_now(btstack_context_callback_registration_t * request, hci_con_handle_t con_handle){ 156 att_server_request_to_send_notification(request, con_handle); 157 } 158 159 /** 160 * @brief Send data 161 * @param con_handle 162 * @param data 163 * @param size 164 */ 165 int nordic_spp_service_server_send(hci_con_handle_t con_handle, const uint8_t * data, uint16_t size){ 166 return att_server_notify(con_handle, nordic_spp_tx_value_handle, data, size); 167 } 168 169