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__ "tx_power_service_server.c" 39 40 41 /** 42 * Implementation of the GATT TX Power Service Server 43 * To use with your application, add `#import <tx_power_service.gatt>` to your .gatt file 44 */ 45 46 #ifdef ENABLE_TESTING_SUPPORT 47 #include <stdio.h> 48 #endif 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 58 #include "ble/gatt-service/tx_power_service_server.h" 59 60 static btstack_context_callback_registration_t tx_power_level_callback; 61 static att_service_handler_t tx_power_service_handler; 62 63 static int8_t tx_power_level_value; 64 static uint16_t tx_power_level_value_handle; 65 66 static uint16_t tx_power_level_client_configuration; 67 static uint16_t tx_power_level_client_configuration_handle; 68 static hci_con_handle_t tx_power_level_client_configuration_con_handle; 69 70 static uint16_t tx_power_service_read_callback(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){ 71 UNUSED(con_handle); 72 73 if (attribute_handle == tx_power_level_value_handle){ 74 return att_read_callback_handle_byte((uint8_t)tx_power_level_value, offset, buffer, buffer_size); 75 } 76 if (attribute_handle == tx_power_level_client_configuration_handle){ 77 return att_read_callback_handle_little_endian_16(tx_power_level_client_configuration, offset, buffer, buffer_size); 78 } 79 return 0; 80 } 81 82 83 static int tx_power_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){ 84 UNUSED(offset); 85 UNUSED(buffer_size); 86 UNUSED(con_handle); 87 88 if (transaction_mode != ATT_TRANSACTION_MODE_NONE){ 89 return 0; 90 } 91 92 if (attribute_handle == tx_power_level_client_configuration_handle){ 93 tx_power_level_client_configuration = little_endian_read_16(buffer, 0); 94 tx_power_level_client_configuration_con_handle = con_handle; 95 } 96 return 0; 97 } 98 99 100 void tx_power_service_server_init(int8_t tx_power_level_dBm){ 101 tx_power_level_value = tx_power_level_dBm; 102 103 // get service handle range 104 uint16_t start_handle = 0; 105 uint16_t end_handle = 0xffff; 106 bool service_found = gatt_server_get_handle_range_for_service_with_uuid16(ORG_BLUETOOTH_SERVICE_TX_POWER, &start_handle, &end_handle); 107 btstack_assert(service_found); 108 UNUSED(service_found); 109 110 // get characteristic value handle and client configuration handle 111 tx_power_level_value_handle = gatt_server_get_value_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_TX_POWER_LEVEL); 112 tx_power_level_client_configuration_handle = gatt_server_get_client_configuration_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_TX_POWER_LEVEL); 113 114 #ifdef ENABLE_TESTING_SUPPORT 115 printf("TXP 0x%02x - 0x%02x \n", start_handle, end_handle); 116 printf(" tx_power_level 0x%02x \n", tx_power_level_value_handle); 117 printf(" tx_power_level CCC 0x%02x \n", tx_power_level_client_configuration_handle); 118 #endif 119 log_info("TX Power Service Server 0x%02x-0x%02x", start_handle, end_handle); 120 121 // register service with ATT Server 122 tx_power_service_handler.start_handle = start_handle; 123 tx_power_service_handler.end_handle = end_handle; 124 tx_power_service_handler.read_callback = &tx_power_service_read_callback; 125 tx_power_service_handler.write_callback = &tx_power_service_write_callback; 126 att_server_register_service_handler(&tx_power_service_handler); 127 } 128 129 static void tx_power_service_can_send_now(void * context){ 130 hci_con_handle_t con_handle = (hci_con_handle_t) (uintptr_t) context; 131 uint8_t value = (uint8_t)tx_power_level_value; 132 att_server_notify(con_handle, tx_power_level_value_handle, &value, 1); 133 } 134 135 void tx_power_service_server_set_level(int8_t tx_power_level_dBm){ 136 tx_power_level_value = tx_power_level_dBm; 137 if (tx_power_level_client_configuration != 0){ 138 tx_power_level_callback.callback = &tx_power_service_can_send_now; 139 tx_power_level_callback.context = (void*) (uintptr_t) tx_power_level_client_configuration_con_handle; 140 att_server_register_can_send_now_callback(&tx_power_level_callback, tx_power_level_client_configuration_con_handle); 141 } 142 } 143