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 // Flags general discoverable, BR/EDR supported (== not supported flag not set) when ENABLE_GATT_OVER_CLASSIC is enabled 91 #ifdef ENABLE_GATT_OVER_CLASSIC 92 #define APP_AD_FLAGS 0x02 93 #else 94 #define APP_AD_FLAGS 0x06 95 #endif 96 97 const uint8_t adv_data[] = { 98 // Flags general discoverable 99 0x02, BLUETOOTH_DATA_TYPE_FLAGS, APP_AD_FLAGS, 100 // Name 101 0x0b, BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME, 'L', 'E', ' ', 'C', 'o', 'u', 'n', 't', 'e', 'r', 102 // Incomplete List of 16-bit Service Class UUIDs -- FF10 - only valid for testing! 103 0x03, BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS, 0x10, 0xff, 104 }; 105 const uint8_t adv_data_len = sizeof(adv_data); 106 107 static void le_counter_setup(void){ 108 109 l2cap_init(); 110 111 // setup le device db 112 le_device_db_init(); 113 114 // setup SM: Display only 115 sm_init(); 116 117 #ifdef ENABLE_GATT_OVER_CLASSIC 118 // init SDP, create record for GATT and register with SDP 119 sdp_init(); 120 memset(gatt_service_buffer, 0, sizeof(gatt_service_buffer)); 121 gatt_create_sdp_record(gatt_service_buffer, 0x10001, ATT_SERVICE_GATT_SERVICE_START_HANDLE, ATT_SERVICE_GATT_SERVICE_END_HANDLE); 122 sdp_register_service(gatt_service_buffer); 123 printf("SDP service record size: %u\n", de_get_len(gatt_service_buffer)); 124 125 // configure Classic GAP 126 gap_set_local_name("GATT Counter BR/EDR 00:00:00:00:00:00"); 127 gap_ssp_set_io_capability(SSP_IO_CAPABILITY_DISPLAY_YES_NO); 128 gap_discoverable_control(1); 129 #endif 130 131 // setup ATT server 132 att_server_init(profile_data, att_read_callback, att_write_callback); 133 134 // setup battery service 135 battery_service_server_init(battery); 136 137 // setup advertisements 138 uint16_t adv_int_min = 0x0030; 139 uint16_t adv_int_max = 0x0030; 140 uint8_t adv_type = 0; 141 bd_addr_t null_addr; 142 memset(null_addr, 0, 6); 143 gap_advertisements_set_params(adv_int_min, adv_int_max, adv_type, 0, null_addr, 0x07, 0x00); 144 gap_advertisements_set_data(adv_data_len, (uint8_t*) adv_data); 145 gap_advertisements_enable(1); 146 147 // register for HCI events 148 hci_event_callback_registration.callback = &packet_handler; 149 hci_add_event_handler(&hci_event_callback_registration); 150 151 // register for ATT event 152 att_server_register_packet_handler(packet_handler); 153 154 // set one-shot timer 155 heartbeat.process = &heartbeat_handler; 156 btstack_run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS); 157 btstack_run_loop_add_timer(&heartbeat); 158 159 // beat once 160 beat(); 161 } 162 /* LISTING_END */ 163 164 /* 165 * @section Heartbeat Handler 166 * 167 * @text The heartbeat handler updates the value of the single Characteristic provided in this example, 168 * and request a ATT_EVENT_CAN_SEND_NOW to send a notification if enabled see Listing heartbeat. 169 */ 170 171 /* LISTING_START(heartbeat): Hearbeat Handler */ 172 static int counter = 0; 173 static char counter_string[30]; 174 static int counter_string_len; 175 176 static void beat(void){ 177 counter++; 178 counter_string_len = sprintf(counter_string, "BTstack counter %04u", counter); 179 puts(counter_string); 180 } 181 182 static void heartbeat_handler(struct btstack_timer_source *ts){ 183 if (le_notification_enabled) { 184 beat(); 185 att_server_request_can_send_now_event(con_handle); 186 } 187 188 // simulate battery drain 189 battery--; 190 if (battery < 50) { 191 battery = 100; 192 } 193 battery_service_server_set_battery_value(battery); 194 195 btstack_run_loop_set_timer(ts, HEARTBEAT_PERIOD_MS); 196 btstack_run_loop_add_timer(ts); 197 } 198 /* LISTING_END */ 199 200 /* 201 * @section Packet Handler 202 * 203 * @text The packet handler is used to: 204 * - stop the counter after a disconnect 205 * - send a notification when the requested ATT_EVENT_CAN_SEND_NOW is received 206 */ 207 208 /* LISTING_START(packetHandler): Packet Handler */ 209 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 210 UNUSED(channel); 211 UNUSED(size); 212 213 if (packet_type != HCI_EVENT_PACKET) return; 214 215 switch (hci_event_packet_get_type(packet)) { 216 case HCI_EVENT_DISCONNECTION_COMPLETE: 217 le_notification_enabled = 0; 218 break; 219 case ATT_EVENT_CAN_SEND_NOW: 220 att_server_notify(con_handle, ATT_CHARACTERISTIC_0000FF11_0000_1000_8000_00805F9B34FB_01_VALUE_HANDLE, (uint8_t*) counter_string, counter_string_len); 221 break; 222 default: 223 break; 224 } 225 } 226 227 /* LISTING_END */ 228 229 /* 230 * @section ATT Read 231 * 232 * @text The ATT Server handles all reads to constant data. For dynamic data like the custom characteristic, the registered 233 * att_read_callback is called. To handle long characteristics and long reads, the att_read_callback is first called 234 * with buffer == NULL, to request the total value length. Then it will be called again requesting a chunk of the value. 235 * See Listing attRead. 236 */ 237 238 /* LISTING_START(attRead): ATT Read */ 239 240 // ATT Client Read Callback for Dynamic Data 241 // - if buffer == NULL, don't copy data, just return size of value 242 // - if buffer != NULL, copy data and return number bytes copied 243 // @param offset defines start of attribute value 244 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){ 245 UNUSED(connection_handle); 246 247 if (att_handle == ATT_CHARACTERISTIC_0000FF11_0000_1000_8000_00805F9B34FB_01_VALUE_HANDLE){ 248 return att_read_callback_handle_blob((const uint8_t *)counter_string, counter_string_len, offset, buffer, buffer_size); 249 } 250 return 0; 251 } 252 /* LISTING_END */ 253 254 255 /* 256 * @section ATT Write 257 * 258 * @text The only valid ATT write in this example is to the Client Characteristic Configuration, which configures notification 259 * and indication. If the ATT handle matches the client configuration handle, the new configuration value is stored and used 260 * in the heartbeat handler to decide if a new value should be sent. See Listing attWrite. 261 */ 262 263 /* LISTING_START(attWrite): ATT Write */ 264 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){ 265 UNUSED(transaction_mode); 266 UNUSED(offset); 267 UNUSED(buffer_size); 268 269 if (att_handle != ATT_CHARACTERISTIC_0000FF11_0000_1000_8000_00805F9B34FB_01_CLIENT_CONFIGURATION_HANDLE) return 0; 270 le_notification_enabled = little_endian_read_16(buffer, 0) == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION; 271 con_handle = connection_handle; 272 return 0; 273 } 274 /* LISTING_END */ 275 276 int btstack_main(void); 277 int btstack_main(void) 278 { 279 le_counter_setup(); 280 281 // turn on! 282 hci_power_control(HCI_POWER_ON); 283 284 return 0; 285 } 286 /* EXAMPLE_END */ 287