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__ "gatt_streamer_server.c" 39 40 // ***************************************************************************** 41 /* EXAMPLE_START(gatt_streamer_server): Performance - Stream Data over GATT (Server) 42 * 43 * @text All newer operating systems provide GATT Client functionality. 44 * This example shows how to get a maximal throughput via BLE: 45 * - send whenever possible, 46 * - use the max ATT MTU. 47 * 48 * @text In theory, we should also update the connection parameters, but we already get 49 * a connection interval of 30 ms and there's no public way to use a shorter 50 * interval with iOS (if we're not implementing an HID device). 51 * 52 * @text Note: To start the streaming, run the example. 53 * On remote device use some GATT Explorer, e.g. LightBlue, BLExplr to enable notifications. 54 */ 55 // ***************************************************************************** 56 57 #include <inttypes.h> 58 #include <stdint.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 63 #include "btstack.h" 64 65 // le_streamer.gatt contains the declaration of the provided GATT Services + Characteristics 66 // le_streamer.h contains the binary representation of le_streamer.gatt 67 // it is generated by the build system by calling: $BTSTACK_ROOT/tool/compile_gatt.py le_streamer.gatt le_streamer.h 68 // it needs to be regenerated when the GATT Database declared in le_streamer.gatt file is modified 69 #include "gatt_streamer_server.h" 70 71 #define REPORT_INTERVAL_MS 3000 72 #define MAX_NR_CONNECTIONS 3 73 74 75 static void hci_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 76 static void att_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 77 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); 78 static void streamer(void); 79 80 // Flags general discoverable, BR/EDR supported (== not supported flag not set) when ENABLE_GATT_OVER_CLASSIC is enabled 81 #ifdef ENABLE_GATT_OVER_CLASSIC 82 #define APP_AD_FLAGS 0x02 83 #else 84 #define APP_AD_FLAGS 0x06 85 #endif 86 87 const uint8_t adv_data[] = { 88 // Flags general discoverable 89 0x02, BLUETOOTH_DATA_TYPE_FLAGS, APP_AD_FLAGS, 90 // Name 91 0x0c, BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME, 'L', 'E', ' ', 'S', 't', 'r', 'e', 'a', 'm', 'e', 'r', 92 // Incomplete List of 16-bit Service Class UUIDs -- FF10 - only valid for testing! 93 0x03, BLUETOOTH_DATA_TYPE_INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS, 0x10, 0xff, 94 }; 95 const uint8_t adv_data_len = sizeof(adv_data); 96 97 static btstack_packet_callback_registration_t hci_event_callback_registration; 98 99 // support for multiple clients 100 typedef struct { 101 char name; 102 int le_notification_enabled; 103 uint16_t value_handle; 104 hci_con_handle_t connection_handle; 105 int counter; 106 char test_data[200]; 107 int test_data_len; 108 uint32_t test_data_sent; 109 uint32_t test_data_start; 110 } le_streamer_connection_t; 111 static le_streamer_connection_t le_streamer_connections[MAX_NR_CONNECTIONS]; 112 113 // round robin sending 114 static int connection_index; 115 116 #ifdef ENABLE_GATT_OVER_CLASSIC 117 static uint8_t gatt_service_buffer[70]; 118 #endif 119 120 static void init_connections(void){ 121 // track connections 122 int i; 123 for (i=0;i<MAX_NR_CONNECTIONS;i++){ 124 le_streamer_connections[i].connection_handle = HCI_CON_HANDLE_INVALID; 125 le_streamer_connections[i].name = 'A' + i; 126 } 127 } 128 129 static le_streamer_connection_t * connection_for_conn_handle(hci_con_handle_t conn_handle){ 130 int i; 131 for (i=0;i<MAX_NR_CONNECTIONS;i++){ 132 if (le_streamer_connections[i].connection_handle == conn_handle) return &le_streamer_connections[i]; 133 } 134 return NULL; 135 } 136 137 static void next_connection_index(void){ 138 connection_index++; 139 if (connection_index == MAX_NR_CONNECTIONS){ 140 connection_index = 0; 141 } 142 } 143 144 /* @section Main Application Setup 145 * 146 * @text Listing MainConfiguration shows main application code. 147 * It initializes L2CAP, the Security Manager, and configures the ATT Server with the pre-compiled 148 * ATT Database generated from $le_streamer.gatt$. Finally, it configures the advertisements 149 * and boots the Bluetooth stack. 150 */ 151 152 /* LISTING_START(MainConfiguration): Init L2CAP, SM, ATT Server, and enable advertisements */ 153 154 static void le_streamer_setup(void){ 155 156 l2cap_init(); 157 158 // setup SM: Display only 159 sm_init(); 160 161 #ifdef ENABLE_GATT_OVER_CLASSIC 162 // init SDP, create record for GATT and register with SDP 163 sdp_init(); 164 memset(gatt_service_buffer, 0, sizeof(gatt_service_buffer)); 165 gatt_create_sdp_record(gatt_service_buffer, 0x10001, ATT_SERVICE_GATT_SERVICE_START_HANDLE, ATT_SERVICE_GATT_SERVICE_END_HANDLE); 166 sdp_register_service(gatt_service_buffer); 167 printf("SDP service record size: %u\n", de_get_len(gatt_service_buffer)); 168 169 // configure Classic GAP 170 gap_set_local_name("GATT Streamer BR/EDR 00:00:00:00:00:00"); 171 gap_ssp_set_io_capability(SSP_IO_CAPABILITY_DISPLAY_YES_NO); 172 gap_discoverable_control(1); 173 #endif 174 175 // setup ATT server 176 att_server_init(profile_data, NULL, att_write_callback); 177 178 // register for HCI events 179 hci_event_callback_registration.callback = &hci_packet_handler; 180 hci_add_event_handler(&hci_event_callback_registration); 181 182 // register for ATT events 183 att_server_register_packet_handler(att_packet_handler); 184 185 // setup advertisements 186 uint16_t adv_int_min = 0x0030; 187 uint16_t adv_int_max = 0x0030; 188 uint8_t adv_type = 0; 189 bd_addr_t null_addr; 190 memset(null_addr, 0, 6); 191 gap_advertisements_set_params(adv_int_min, adv_int_max, adv_type, 0, null_addr, 0x07, 0x00); 192 gap_advertisements_set_data(adv_data_len, (uint8_t*) adv_data); 193 gap_advertisements_enable(1); 194 195 // init client state 196 init_connections(); 197 } 198 /* LISTING_END */ 199 200 /* 201 * @section Track throughput 202 * @text We calculate the throughput by setting a start time and measuring the amount of 203 * data sent. After a configurable REPORT_INTERVAL_MS, we print the throughput in kB/s 204 * and reset the counter and start time. 205 */ 206 207 /* LISTING_START(tracking): Tracking throughput */ 208 209 static void test_reset(le_streamer_connection_t * context){ 210 context->test_data_start = btstack_run_loop_get_time_ms(); 211 context->test_data_sent = 0; 212 } 213 214 static void test_track_sent(le_streamer_connection_t * context, int bytes_sent){ 215 context->test_data_sent += bytes_sent; 216 // evaluate 217 uint32_t now = btstack_run_loop_get_time_ms(); 218 uint32_t time_passed = now - context->test_data_start; 219 if (time_passed < REPORT_INTERVAL_MS) return; 220 // print speed 221 int bytes_per_second = context->test_data_sent * 1000 / time_passed; 222 printf("%c: %"PRIu32" bytes sent-> %u.%03u kB/s\n", context->name, context->test_data_sent, bytes_per_second / 1000, bytes_per_second % 1000); 223 224 // restart 225 context->test_data_start = now; 226 context->test_data_sent = 0; 227 } 228 /* LISTING_END(tracking): Tracking throughput */ 229 230 /* 231 * @section HCI Packet Handler 232 * 233 * @text The packet handler is used track incoming connections and to stop notifications on disconnect 234 * It is also a good place to request the connection parameter update as indicated 235 * in the commented code block. 236 */ 237 238 /* LISTING_START(hciPacketHandler): Packet Handler */ 239 static void hci_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 240 UNUSED(channel); 241 UNUSED(size); 242 243 uint16_t conn_interval; 244 hci_con_handle_t con_handle; 245 246 if (packet_type != HCI_EVENT_PACKET) return; 247 248 switch (hci_event_packet_get_type(packet)) { 249 case BTSTACK_EVENT_STATE: 250 // BTstack activated, get started 251 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING) { 252 printf("To start the streaming, please run the le_streamer_client example on other device, or use some GATT Explorer, e.g. LightBlue, BLExplr.\n"); 253 } 254 break; 255 case HCI_EVENT_DISCONNECTION_COMPLETE: 256 con_handle = hci_event_disconnection_complete_get_connection_handle(packet); 257 printf("- LE Connection 0x%04x: disconnect, reason %02x\n", con_handle, hci_event_disconnection_complete_get_reason(packet)); 258 break; 259 case HCI_EVENT_LE_META: 260 switch (hci_event_le_meta_get_subevent_code(packet)) { 261 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 262 // print connection parameters (without using float operations) 263 con_handle = hci_subevent_le_connection_complete_get_connection_handle(packet); 264 conn_interval = hci_subevent_le_connection_complete_get_conn_interval(packet); 265 printf("- LE Connection 0x%04x: connected - connection interval %u.%02u ms, latency %u\n", con_handle, conn_interval * 125 / 100, 266 25 * (conn_interval & 3), hci_subevent_le_connection_complete_get_conn_latency(packet)); 267 268 // request min con interval 15 ms for iOS 11+ 269 printf("- LE Connection 0x%04x: request 15 ms connection interval\n", con_handle); 270 gap_request_connection_parameter_update(con_handle, 12, 12, 0, 0x0048); 271 break; 272 case HCI_SUBEVENT_LE_CONNECTION_UPDATE_COMPLETE: 273 // print connection parameters (without using float operations) 274 con_handle = hci_subevent_le_connection_update_complete_get_connection_handle(packet); 275 conn_interval = hci_subevent_le_connection_update_complete_get_conn_interval(packet); 276 printf("- LE Connection 0x%04x: connection update - connection interval %u.%02u ms, latency %u\n", con_handle, conn_interval * 125 / 100, 277 25 * (conn_interval & 3), hci_subevent_le_connection_update_complete_get_conn_latency(packet)); 278 break; 279 default: 280 break; 281 } 282 break; 283 284 default: 285 break; 286 } 287 } 288 289 /* LISTING_END */ 290 291 /* 292 * @section ATT Packet Handler 293 * 294 * @text The packet handler is used to track the ATT MTU Exchange and trigger ATT send 295 */ 296 297 /* LISTING_START(attPacketHandler): Packet Handler */ 298 static void att_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 299 UNUSED(channel); 300 UNUSED(size); 301 302 int mtu; 303 le_streamer_connection_t * context; 304 switch (packet_type) { 305 case HCI_EVENT_PACKET: 306 switch (hci_event_packet_get_type(packet)) { 307 case ATT_EVENT_CONNECTED: 308 // setup new 309 context = connection_for_conn_handle(HCI_CON_HANDLE_INVALID); 310 if (!context) break; 311 context->counter = 'A'; 312 context->connection_handle = att_event_connected_get_handle(packet); 313 context->test_data_len = btstack_min(att_server_get_mtu(context->connection_handle) - 3, sizeof(context->test_data)); 314 printf("%c: ATT connected, handle 0x%04x, test data len %u\n", context->name, context->connection_handle, context->test_data_len); 315 break; 316 case ATT_EVENT_MTU_EXCHANGE_COMPLETE: 317 mtu = att_event_mtu_exchange_complete_get_MTU(packet) - 3; 318 context = connection_for_conn_handle(att_event_mtu_exchange_complete_get_handle(packet)); 319 if (!context) break; 320 context->test_data_len = btstack_min(mtu - 3, sizeof(context->test_data)); 321 printf("%c: ATT MTU = %u => use test data of len %u\n", context->name, mtu, context->test_data_len); 322 break; 323 case ATT_EVENT_CAN_SEND_NOW: 324 streamer(); 325 break; 326 case ATT_EVENT_DISCONNECTED: 327 context = connection_for_conn_handle(att_event_disconnected_get_handle(packet)); 328 if (!context) break; 329 // free connection 330 printf("%c: ATT disconnected, handle 0x%04x\n", context->name, context->connection_handle); 331 context->le_notification_enabled = 0; 332 context->connection_handle = HCI_CON_HANDLE_INVALID; 333 break; 334 default: 335 break; 336 } 337 break; 338 default: 339 break; 340 } 341 } 342 /* LISTING_END */ 343 344 /* 345 * @section Streamer 346 * 347 * @text The streamer function checks if notifications are enabled and if a notification can be sent now. 348 * It creates some test data - a single letter that gets increased every time - and tracks the data sent. 349 */ 350 351 /* LISTING_START(streamer): Streaming code */ 352 static void streamer(void){ 353 354 // find next active streaming connection 355 int old_connection_index = connection_index; 356 while (1){ 357 // active found? 358 if ((le_streamer_connections[connection_index].connection_handle != HCI_CON_HANDLE_INVALID) && 359 (le_streamer_connections[connection_index].le_notification_enabled)) break; 360 361 // check next 362 next_connection_index(); 363 364 // none found 365 if (connection_index == old_connection_index) return; 366 } 367 368 le_streamer_connection_t * context = &le_streamer_connections[connection_index]; 369 370 // create test data 371 context->counter++; 372 if (context->counter > 'Z') context->counter = 'A'; 373 memset(context->test_data, context->counter, context->test_data_len); 374 375 // send 376 att_server_notify(context->connection_handle, context->value_handle, (uint8_t*) context->test_data, context->test_data_len); 377 378 // track 379 test_track_sent(context, context->test_data_len); 380 381 // request next send event 382 att_server_request_can_send_now_event(context->connection_handle); 383 384 // check next 385 next_connection_index(); 386 } 387 /* LISTING_END */ 388 389 /* 390 * @section ATT Write 391 * 392 * @text The only valid ATT write in this example is to the Client Characteristic Configuration, which configures notification 393 * and indication. If the ATT handle matches the client configuration handle, the new configuration value is stored. 394 * If notifications get enabled, an ATT_EVENT_CAN_SEND_NOW is requested. See Listing attWrite. 395 */ 396 397 /* LISTING_START(attWrite): ATT Write */ 398 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){ 399 UNUSED(offset); 400 401 // printf("att_write_callback att_handle 0x%04x, transaction mode %u\n", att_handle, transaction_mode); 402 if (transaction_mode != ATT_TRANSACTION_MODE_NONE) return 0; 403 le_streamer_connection_t * context = connection_for_conn_handle(con_handle); 404 switch(att_handle){ 405 case ATT_CHARACTERISTIC_0000FF11_0000_1000_8000_00805F9B34FB_01_CLIENT_CONFIGURATION_HANDLE: 406 case ATT_CHARACTERISTIC_0000FF12_0000_1000_8000_00805F9B34FB_01_CLIENT_CONFIGURATION_HANDLE: 407 context->le_notification_enabled = little_endian_read_16(buffer, 0) == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION; 408 printf("%c: Notifications enabled %u\n", context->name, context->le_notification_enabled); 409 if (context->le_notification_enabled){ 410 switch (att_handle){ 411 case ATT_CHARACTERISTIC_0000FF11_0000_1000_8000_00805F9B34FB_01_CLIENT_CONFIGURATION_HANDLE: 412 context->value_handle = ATT_CHARACTERISTIC_0000FF11_0000_1000_8000_00805F9B34FB_01_VALUE_HANDLE; 413 break; 414 case ATT_CHARACTERISTIC_0000FF12_0000_1000_8000_00805F9B34FB_01_CLIENT_CONFIGURATION_HANDLE: 415 context->value_handle = ATT_CHARACTERISTIC_0000FF12_0000_1000_8000_00805F9B34FB_01_VALUE_HANDLE; 416 break; 417 default: 418 break; 419 } 420 att_server_request_can_send_now_event(context->connection_handle); 421 } 422 test_reset(context); 423 break; 424 case ATT_CHARACTERISTIC_0000FF11_0000_1000_8000_00805F9B34FB_01_VALUE_HANDLE: 425 case ATT_CHARACTERISTIC_0000FF12_0000_1000_8000_00805F9B34FB_01_VALUE_HANDLE: 426 test_track_sent(context, buffer_size); 427 break; 428 default: 429 printf("Write to 0x%04x, len %u\n", att_handle, buffer_size); 430 break; 431 } 432 return 0; 433 } 434 /* LISTING_END */ 435 436 int btstack_main(void); 437 int btstack_main(void) 438 { 439 le_streamer_setup(); 440 441 // turn on! 442 hci_power_control(HCI_POWER_ON); 443 444 return 0; 445 } 446 /* EXAMPLE_END */ 447