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__ "nordic_spp_le_streamer.c" 39 40 // ***************************************************************************** 41 /* EXAMPLE_START(nordic_spp_le_streamer): LE Nordic SPP-like Streamer 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 #include "ble/gatt-service/nordic_spp_service_server.h" 65 66 // nordic_spp_le_streamer.gatt contains the declaration of the provided GATT Services + Characteristics 67 // nordic_spp_le_streamer.h contains the binary representation of nordic_spp_le_streamer.gatt 68 // it is generated by the build system by calling: $BTSTACK_ROOT/tool/compile_gatt.py nordic_spp_le_streamer.gatt nordic_spp_le_streamer.h 69 // it needs to be regenerated when the GATT Database declared in nordic_spp_le_streamer.gatt file is modified 70 #include "nordic_spp_le_streamer.h" 71 72 #define REPORT_INTERVAL_MS 3000 73 #define MAX_NR_CONNECTIONS 3 74 75 const uint8_t adv_data[] = { 76 // Flags general discoverable, BR/EDR not supported 77 2, BLUETOOTH_DATA_TYPE_FLAGS, 0x06, 78 // Name 79 8, BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME, 'n', 'R', 'F',' ', 'S', 'P', 'P', 80 // UUID ... 81 17, BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS, 0x9e, 0xca, 0xdc, 0x24, 0xe, 0xe5, 0xa9, 0xe0, 0x93, 0xf3, 0xa3, 0xb5, 0x1, 0x0, 0x40, 0x6e, 82 }; 83 const uint8_t adv_data_len = sizeof(adv_data); 84 85 static btstack_packet_callback_registration_t hci_event_callback_registration; 86 87 // support for multiple clients 88 typedef struct { 89 char name; 90 int le_notification_enabled; 91 hci_con_handle_t connection_handle; 92 int counter; 93 char test_data[200]; 94 int test_data_len; 95 uint32_t test_data_sent; 96 uint32_t test_data_start; 97 btstack_context_callback_registration_t send_request; 98 } nordic_spp_le_streamer_connection_t; 99 100 static nordic_spp_le_streamer_connection_t nordic_spp_le_streamer_connections[MAX_NR_CONNECTIONS]; 101 102 // round robin sending 103 static int connection_index; 104 105 static void init_connections(void){ 106 // track connections 107 int i; 108 for (i=0;i<MAX_NR_CONNECTIONS;i++){ 109 nordic_spp_le_streamer_connections[i].connection_handle = HCI_CON_HANDLE_INVALID; 110 nordic_spp_le_streamer_connections[i].name = 'A' + i; 111 } 112 } 113 114 static nordic_spp_le_streamer_connection_t * connection_for_conn_handle(hci_con_handle_t conn_handle){ 115 int i; 116 for (i=0;i<MAX_NR_CONNECTIONS;i++){ 117 if (nordic_spp_le_streamer_connections[i].connection_handle == conn_handle) return &nordic_spp_le_streamer_connections[i]; 118 } 119 return NULL; 120 } 121 122 static void next_connection_index(void){ 123 connection_index++; 124 if (connection_index == MAX_NR_CONNECTIONS){ 125 connection_index = 0; 126 } 127 } 128 129 /* 130 * @section Track throughput 131 * @text We calculate the throughput by setting a start time and measuring the amount of 132 * data sent. After a configurable REPORT_INTERVAL_MS, we print the throughput in kB/s 133 * and reset the counter and start time. 134 */ 135 136 /* LISTING_START(tracking): Tracking throughput */ 137 138 static void test_reset(nordic_spp_le_streamer_connection_t * context){ 139 context->test_data_start = btstack_run_loop_get_time_ms(); 140 context->test_data_sent = 0; 141 } 142 143 static void test_track_sent(nordic_spp_le_streamer_connection_t * context, int bytes_sent){ 144 context->test_data_sent += bytes_sent; 145 // evaluate 146 uint32_t now = btstack_run_loop_get_time_ms(); 147 uint32_t time_passed = now - context->test_data_start; 148 if (time_passed < REPORT_INTERVAL_MS) return; 149 // print speed 150 int bytes_per_second = context->test_data_sent * 1000 / time_passed; 151 printf("%c: %"PRIu32" bytes sent-> %u.%03u kB/s\n", context->name, context->test_data_sent, bytes_per_second / 1000, bytes_per_second % 1000); 152 153 // restart 154 context->test_data_start = now; 155 context->test_data_sent = 0; 156 } 157 /* LISTING_END(tracking): Tracking throughput */ 158 159 /* 160 * @section HCI Packet Handler 161 * 162 * @text The packet handler prints the welcome message and requests a connection paramter update for LE Connections 163 */ 164 165 /* LISTING_START(packetHandler): Packet Handler */ 166 static void hci_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 167 UNUSED(channel); 168 UNUSED(size); 169 170 uint16_t conn_interval; 171 hci_con_handle_t con_handle; 172 173 if (packet_type != HCI_EVENT_PACKET) return; 174 175 switch (hci_event_packet_get_type(packet)) { 176 case BTSTACK_EVENT_STATE: 177 // BTstack activated, get started 178 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING) { 179 printf("To start the streaming, please run nRF Toolbox -> UART to connect.\n"); 180 } 181 break; 182 case HCI_EVENT_LE_META: 183 switch (hci_event_le_meta_get_subevent_code(packet)) { 184 case HCI_SUBEVENT_LE_CONNECTION_COMPLETE: 185 // print connection parameters (without using float operations) 186 con_handle = hci_subevent_le_connection_complete_get_connection_handle(packet); 187 conn_interval = hci_subevent_le_connection_complete_get_conn_interval(packet); 188 printf("LE Connection - Connection Interval: %u.%02u ms\n", conn_interval * 125 / 100, 25 * (conn_interval & 3)); 189 printf("LE Connection - Connection Latency: %u\n", hci_subevent_le_connection_complete_get_conn_latency(packet)); 190 191 // request min con interval 15 ms for iOS 11+ 192 printf("LE Connection - Request 15 ms connection interval\n"); 193 gap_request_connection_parameter_update(con_handle, 12, 12, 0, 0x0048); 194 break; 195 case HCI_SUBEVENT_LE_CONNECTION_UPDATE_COMPLETE: 196 // print connection parameters (without using float operations) 197 con_handle = hci_subevent_le_connection_update_complete_get_connection_handle(packet); 198 conn_interval = hci_subevent_le_connection_update_complete_get_conn_interval(packet); 199 printf("LE Connection - Connection Param update - connection interval %u.%02u ms, latency %u\n", conn_interval * 125 / 100, 200 25 * (conn_interval & 3), hci_subevent_le_connection_update_complete_get_conn_latency(packet)); 201 break; 202 default: 203 break; 204 } 205 break; 206 default: 207 break; 208 } 209 } 210 /* LISTING_END */ 211 212 /* 213 * @section ATT Packet Handler 214 * 215 * @text The packet handler is used to setup and tear down the spp-over-gatt connection and its MTU 216 */ 217 218 /* LISTING_START(packetHandler): Packet Handler */ 219 static void att_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 220 UNUSED(channel); 221 UNUSED(size); 222 223 if (packet_type != HCI_EVENT_PACKET) return; 224 225 int mtu; 226 nordic_spp_le_streamer_connection_t * context; 227 228 switch (hci_event_packet_get_type(packet)) { 229 case ATT_EVENT_CONNECTED: 230 // setup new 231 context = connection_for_conn_handle(HCI_CON_HANDLE_INVALID); 232 if (!context) break; 233 context->counter = 'A'; 234 context->test_data_len = ATT_DEFAULT_MTU - 4; // -1 for nordic 0x01 packet type 235 context->connection_handle = att_event_connected_get_handle(packet); 236 break; 237 case ATT_EVENT_MTU_EXCHANGE_COMPLETE: 238 mtu = att_event_mtu_exchange_complete_get_MTU(packet) - 3; 239 context = connection_for_conn_handle(att_event_mtu_exchange_complete_get_handle(packet)); 240 if (!context) break; 241 context->test_data_len = btstack_min(mtu - 3, sizeof(context->test_data)); 242 printf("%c: ATT MTU = %u => use test data of len %u\n", context->name, mtu, context->test_data_len); 243 break; 244 case ATT_EVENT_DISCONNECTED: 245 context = connection_for_conn_handle(att_event_disconnected_get_handle(packet)); 246 if (!context) break; 247 // free connection 248 printf("%c: Disconnect\n", context->name); 249 context->le_notification_enabled = 0; 250 context->connection_handle = HCI_CON_HANDLE_INVALID; 251 break; 252 default: 253 break; 254 } 255 } 256 /* LISTING_END */ 257 258 259 260 /* 261 * @section Streamer 262 * 263 * @text The streamer function checks if notifications are enabled and if a notification can be sent now. 264 * It creates some test data - a single letter that gets increased every time - and tracks the data sent. 265 */ 266 267 /* LISTING_START(streamer): Streaming code */ 268 static void nordic_can_send(void * some_context){ 269 UNUSED(some_context); 270 271 // find next active streaming connection 272 int old_connection_index = connection_index; 273 while (1){ 274 // active found? 275 if ((nordic_spp_le_streamer_connections[connection_index].connection_handle != HCI_CON_HANDLE_INVALID) && 276 (nordic_spp_le_streamer_connections[connection_index].le_notification_enabled)) break; 277 278 // check next 279 next_connection_index(); 280 281 // none found 282 if (connection_index == old_connection_index) return; 283 } 284 285 nordic_spp_le_streamer_connection_t * context = &nordic_spp_le_streamer_connections[connection_index]; 286 287 // create test data 288 context->counter++; 289 if (context->counter > 'Z') context->counter = 'A'; 290 memset(context->test_data, context->counter, context->test_data_len); 291 292 // send 293 nordic_spp_service_server_send(context->connection_handle, (uint8_t*) context->test_data, context->test_data_len); 294 295 // track 296 test_track_sent(context, context->test_data_len); 297 298 // request next send event 299 nordic_spp_service_server_request_can_send_now(&context->send_request, context->connection_handle); 300 301 // check next 302 next_connection_index(); 303 } 304 /* LISTING_END */ 305 306 static void nordic_data_received(hci_con_handle_t tx_con_handle, const uint8_t * data, uint16_t size){ 307 nordic_spp_le_streamer_connection_t * context = connection_for_conn_handle(tx_con_handle); 308 309 if (!context) return; 310 311 if (size == 0 && context->le_notification_enabled == 0){ 312 context->le_notification_enabled = 1; 313 test_reset(context); 314 context->send_request.callback = &nordic_can_send; 315 nordic_spp_service_server_request_can_send_now(&context->send_request, context->connection_handle); 316 } else { 317 printf("RECV: "); 318 printf_hexdump(data, size); 319 test_track_sent(context, size); 320 } 321 } 322 323 int btstack_main(void); 324 int btstack_main(void){ 325 // register for HCI events 326 hci_event_callback_registration.callback = &hci_packet_handler; 327 hci_add_event_handler(&hci_event_callback_registration); 328 329 l2cap_init(); 330 331 // setup LE device DB 332 le_device_db_init(); 333 334 // setup SM: Display only 335 sm_init(); 336 337 // setup ATT server 338 att_server_init(profile_data, NULL, NULL); 339 340 // setup Nordic SPP service 341 nordic_spp_service_server_init(&nordic_data_received); 342 343 // register for ATT events 344 att_server_register_packet_handler(att_packet_handler); 345 346 // setup advertisements 347 uint16_t adv_int_min = 0x0030; 348 uint16_t adv_int_max = 0x0030; 349 uint8_t adv_type = 0; 350 bd_addr_t null_addr; 351 memset(null_addr, 0, 6); 352 gap_advertisements_set_params(adv_int_min, adv_int_max, adv_type, 0, null_addr, 0x07, 0x00); 353 gap_advertisements_set_data(adv_data_len, (uint8_t*) adv_data); 354 gap_advertisements_enable(1); 355 356 // init client state 357 init_connections(); 358 359 // turn on! 360 hci_power_control(HCI_POWER_ON); 361 362 return 0; 363 } 364 /* EXAMPLE_END */ 365