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 MATTHIAS 24 * RINGWALD 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__ "gatt_counter.c" 39 40 // ***************************************************************************** 41 /* EXAMPLE_START(gatt_counter): GATT Server - Heartbeat Counter over GATT 42 * 43 * @text All newer operating systems provide GATT Client functionality. 44 * The LE Counter examples demonstrates how to specify a minimal GATT Database 45 * with a custom GATT Service and a custom Characteristic that sends periodic 46 * notifications. 47 */ 48 // ***************************************************************************** 49 50 #include <stdint.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 55 #include "gatt_counter.h" 56 #include "btstack.h" 57 #include "ble/gatt-service/battery_service_server.h" 58 59 #define HEARTBEAT_PERIOD_MS 1000 60 61 /* @section Main Application Setup 62 * 63 * @text Listing MainConfiguration shows main application code. 64 * It initializes L2CAP, the Security Manager and configures the ATT Server with the pre-compiled 65 * ATT Database generated from $le_counter.gatt$. 66 * Additionally, it enables the Battery Service Server with the current battery level. 67 * Finally, it configures the advertisements 68 * and the heartbeat handler and boots the Bluetooth stack. 69 * In this example, the Advertisement contains the Flags attribute and the device name. 70 * The flag 0x06 indicates: LE General Discoverable Mode and BR/EDR not supported. 71 */ 72 73 /* LISTING_START(MainConfiguration): Init L2CAP SM ATT Server and start heartbeat timer */ 74 static int le_notification_enabled; 75 static btstack_timer_source_t heartbeat; 76 static btstack_packet_callback_registration_t hci_event_callback_registration; 77 static hci_con_handle_t con_handle; 78 static uint8_t battery = 100; 79 80 #ifdef ENABLE_GATT_OVER_CLASSIC 81 static uint8_t gatt_service_buffer[70]; 82 #endif 83 84 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 85 static uint16_t att_read_callback(hci_con_handle_t con_handle, uint16_t att_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size); 86 static int att_write_callback(hci_con_handle_t con_handle, uint16_t att_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size); 87 static void heartbeat_handler(struct btstack_timer_source *ts); 88 static void beat(void); 89 90 const uint8_t adv_data[] = { 91 // Flags general discoverable, BR/EDR not supported 92 0x02, BLUETOOTH_DATA_TYPE_FLAGS, 0x06, 93 // Name 94 0x0b, BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME, 'L', 'E', ' ', 'C', 'o', 'u', 'n', 't', 'e', 'r', 95 // Incomplete List of 16-bit Service Class UUIDs -- FF10 - only valid for testing! 96 0x03, BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS, 0x10, 0xff, 97 }; 98 const uint8_t adv_data_len = sizeof(adv_data); 99 100 static void le_counter_setup(void){ 101 102 l2cap_init(); 103 104 // setup le device db 105 le_device_db_init(); 106 107 // setup SM: Display only 108 sm_init(); 109 110 #ifdef ENABLE_GATT_OVER_CLASSIC 111 // init SDP, create record for GATT and register with SDP 112 sdp_init(); 113 memset(gatt_service_buffer, 0, sizeof(gatt_service_buffer)); 114 gatt_create_sdp_record(gatt_service_buffer, 0x10001, ATT_SERVICE_GATT_SERVICE_START_HANDLE, ATT_SERVICE_GATT_SERVICE_END_HANDLE); 115 sdp_register_service(gatt_service_buffer); 116 printf("SDP service record size: %u\n", de_get_len(gatt_service_buffer)); 117 118 // configure Classic GAP 119 gap_set_local_name("GATT Counter BR/EDR 00:00:00:00:00:00"); 120 gap_ssp_set_io_capability(SSP_IO_CAPABILITY_DISPLAY_YES_NO); 121 gap_discoverable_control(1); 122 #endif 123 124 // setup ATT server 125 att_server_init(profile_data, att_read_callback, att_write_callback); 126 127 // setup battery service 128 battery_service_server_init(battery); 129 130 // setup advertisements 131 uint16_t adv_int_min = 0x0030; 132 uint16_t adv_int_max = 0x0030; 133 uint8_t adv_type = 0; 134 bd_addr_t null_addr; 135 memset(null_addr, 0, 6); 136 gap_advertisements_set_params(adv_int_min, adv_int_max, adv_type, 0, null_addr, 0x07, 0x00); 137 gap_advertisements_set_data(adv_data_len, (uint8_t*) adv_data); 138 gap_advertisements_enable(1); 139 140 // register for HCI events 141 hci_event_callback_registration.callback = &packet_handler; 142 hci_add_event_handler(&hci_event_callback_registration); 143 144 // register for ATT event 145 att_server_register_packet_handler(packet_handler); 146 147 // set one-shot timer 148 heartbeat.process = &heartbeat_handler; 149 btstack_run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS); 150 btstack_run_loop_add_timer(&heartbeat); 151 152 // beat once 153 beat(); 154 } 155 /* LISTING_END */ 156 157 /* 158 * @section Heartbeat Handler 159 * 160 * @text The heartbeat handler updates the value of the single Characteristic provided in this example, 161 * and request a ATT_EVENT_CAN_SEND_NOW to send a notification if enabled see Listing heartbeat. 162 */ 163 164 /* LISTING_START(heartbeat): Hearbeat Handler */ 165 static int counter = 0; 166 static char counter_string[30]; 167 static int counter_string_len; 168 169 static void beat(void){ 170 counter++; 171 counter_string_len = sprintf(counter_string, "BTstack counter %04u", counter); 172 puts(counter_string); 173 } 174 175 static void heartbeat_handler(struct btstack_timer_source *ts){ 176 if (le_notification_enabled) { 177 beat(); 178 att_server_request_can_send_now_event(con_handle); 179 } 180 181 // simulate battery drain 182 battery--; 183 if (battery < 50) { 184 battery = 100; 185 } 186 battery_service_server_set_battery_value(battery); 187 188 btstack_run_loop_set_timer(ts, HEARTBEAT_PERIOD_MS); 189 btstack_run_loop_add_timer(ts); 190 } 191 /* LISTING_END */ 192 193 /* 194 * @section Packet Handler 195 * 196 * @text The packet handler is used to: 197 * - stop the counter after a disconnect 198 * - send a notification when the requested ATT_EVENT_CAN_SEND_NOW is received 199 */ 200 201 /* LISTING_START(packetHandler): Packet Handler */ 202 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 203 UNUSED(channel); 204 UNUSED(size); 205 206 if (packet_type != HCI_EVENT_PACKET) return; 207 208 switch (hci_event_packet_get_type(packet)) { 209 case HCI_EVENT_DISCONNECTION_COMPLETE: 210 le_notification_enabled = 0; 211 break; 212 case ATT_EVENT_CAN_SEND_NOW: 213 att_server_notify(con_handle, ATT_CHARACTERISTIC_0000FF11_0000_1000_8000_00805F9B34FB_01_VALUE_HANDLE, (uint8_t*) counter_string, counter_string_len); 214 break; 215 default: 216 break; 217 } 218 } 219 220 /* LISTING_END */ 221 222 /* 223 * @section ATT Read 224 * 225 * @text The ATT Server handles all reads to constant data. For dynamic data like the custom characteristic, the registered 226 * att_read_callback is called. To handle long characteristics and long reads, the att_read_callback is first called 227 * with buffer == NULL, to request the total value length. Then it will be called again requesting a chunk of the value. 228 * See Listing attRead. 229 */ 230 231 /* LISTING_START(attRead): ATT Read */ 232 233 // ATT Client Read Callback for Dynamic Data 234 // - if buffer == NULL, don't copy data, just return size of value 235 // - if buffer != NULL, copy data and return number bytes copied 236 // @param offset defines start of attribute value 237 static uint16_t att_read_callback(hci_con_handle_t connection_handle, uint16_t att_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){ 238 UNUSED(connection_handle); 239 240 if (att_handle == ATT_CHARACTERISTIC_0000FF11_0000_1000_8000_00805F9B34FB_01_VALUE_HANDLE){ 241 return att_read_callback_handle_blob((const uint8_t *)counter_string, counter_string_len, offset, buffer, buffer_size); 242 } 243 return 0; 244 } 245 /* LISTING_END */ 246 247 248 /* 249 * @section ATT Write 250 * 251 * @text The only valid ATT write in this example is to the Client Characteristic Configuration, which configures notification 252 * and indication. If the ATT handle matches the client configuration handle, the new configuration value is stored and used 253 * in the heartbeat handler to decide if a new value should be sent. See Listing attWrite. 254 */ 255 256 /* LISTING_START(attWrite): ATT Write */ 257 static int att_write_callback(hci_con_handle_t connection_handle, uint16_t att_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size){ 258 UNUSED(transaction_mode); 259 UNUSED(offset); 260 UNUSED(buffer_size); 261 262 if (att_handle != ATT_CHARACTERISTIC_0000FF11_0000_1000_8000_00805F9B34FB_01_CLIENT_CONFIGURATION_HANDLE) return 0; 263 le_notification_enabled = little_endian_read_16(buffer, 0) == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION; 264 con_handle = connection_handle; 265 return 0; 266 } 267 /* LISTING_END */ 268 269 int btstack_main(void); 270 int btstack_main(void) 271 { 272 le_counter_setup(); 273 274 // turn on! 275 hci_power_control(HCI_POWER_ON); 276 277 return 0; 278 } 279 /* EXAMPLE_END */ 280