/* * Copyright (C) 2018 BlueKitchen GmbH * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the copyright holders nor the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * 4. Any redistribution, use, or modification is done solely for * personal benefit and not for any commercial purpose or for * monetary gain. * * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Please inquire about commercial licensing options at * contact@bluekitchen-gmbh.com * */ #define __BTSTACK_FILE__ "le_data_channel_client.c" /* * le_data_channel_client.c */ // ***************************************************************************** /* EXAMPLE_START(le_data_channel_client): Connects to 'LE Data Channel' and streams data * via LE Data Channel == LE Connection-Oriented Channel == LE Credit-based Connection */ // ***************************************************************************** #include #include #include #include #include #include "btstack.h" #define TEST_STREAM_DATA #define TEST_PACKET_SIZE 1000 static enum { TC_OFF, TC_IDLE, TC_W4_SCAN_RESULT, TC_W4_CONNECT, TC_W4_CHANNEL, TC_TEST_DATA } state = TC_OFF; const uint16_t TSPX_le_psm = 0x25; static bd_addr_t cmdline_addr; static int cmdline_addr_found = 0; // addr and type of device with correct name static bd_addr_t le_data_channel_addr; static bd_addr_type_t le_data_channel_addr_type; static hci_con_handle_t connection_handle; static btstack_packet_callback_registration_t hci_event_callback_registration; static uint8_t data_channel_buffer[TEST_PACKET_SIZE]; /* * @section Track throughput * @text We calculate the throughput by setting a start time and measuring the amount of * data sent. After a configurable REPORT_INTERVAL_MS, we print the throughput in kB/s * and reset the counter and start time. */ /* LISTING_START(tracking): Tracking throughput */ #define REPORT_INTERVAL_MS 3000 // support for multiple clients typedef struct { char name; hci_con_handle_t connection_handle; uint16_t cid; int counter; char test_data[TEST_PACKET_SIZE]; int test_data_len; uint32_t test_data_sent; uint32_t test_data_start; } le_data_channel_connection_t; static le_data_channel_connection_t le_data_channel_connection; static void test_reset(le_data_channel_connection_t * context){ context->test_data_start = btstack_run_loop_get_time_ms(); context->test_data_sent = 0; } static void test_track_data(le_data_channel_connection_t * context, int bytes_transferred){ context->test_data_sent += bytes_transferred; // evaluate uint32_t now = btstack_run_loop_get_time_ms(); uint32_t time_passed = now - context->test_data_start; if (time_passed < REPORT_INTERVAL_MS) return; // print speed int bytes_per_second = context->test_data_sent * 1000 / time_passed; printf("%c: %"PRIu32" bytes -> %u.%03u kB/s\n", context->name, context->test_data_sent, bytes_per_second / 1000, bytes_per_second % 1000); // restart context->test_data_start = now; context->test_data_sent = 0; } /* LISTING_END(tracking): Tracking throughput */ // returns 1 if name is found in advertisement static int advertisement_report_contains_name(const char * name, uint8_t * advertisement_report){ // get advertisement from report event const uint8_t * adv_data = gap_event_advertising_report_get_data(advertisement_report); uint16_t adv_len = gap_event_advertising_report_get_data_length(advertisement_report); int name_len = strlen(name); // iterate over advertisement data ad_context_t context; for (ad_iterator_init(&context, adv_len, adv_data) ; ad_iterator_has_more(&context) ; ad_iterator_next(&context)){ uint8_t data_type = ad_iterator_get_data_type(&context); uint8_t data_size = ad_iterator_get_data_len(&context); const uint8_t * data = ad_iterator_get_data(&context); int i; switch (data_type){ case BLUETOOTH_DATA_TYPE_SHORTENED_LOCAL_NAME: case BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME: // compare common prefix for (i=0; i 'Z') le_data_channel_connection.counter = 'A'; memset(le_data_channel_connection.test_data, le_data_channel_connection.counter, le_data_channel_connection.test_data_len); // send l2cap_le_send_data(le_data_channel_connection.cid, (uint8_t *) le_data_channel_connection.test_data, le_data_channel_connection.test_data_len); // track test_track_data(&le_data_channel_connection, le_data_channel_connection.test_data_len); // request another packet l2cap_le_request_can_send_now_event(le_data_channel_connection.cid); } /* LISTING_END */ #endif // Either connect to remote specified on command line or start scan for device with "LE Data Channel" in advertisement static void le_data_channel_client_start(void){ if (cmdline_addr_found){ printf("Connect to %s\n", bd_addr_to_str(cmdline_addr)); state = TC_W4_CONNECT; gap_connect(cmdline_addr, 0); } else { printf("Start scanning!\n"); state = TC_W4_SCAN_RESULT; gap_set_scan_parameters(0,0x0030, 0x0030); gap_start_scan(); } } static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ UNUSED(channel); UNUSED(size); bd_addr_t event_address; uint16_t psm; uint16_t cid; uint16_t conn_interval; hci_con_handle_t handle; switch (packet_type) { case HCI_EVENT_PACKET: switch (hci_event_packet_get_type(packet)) { case BTSTACK_EVENT_STATE: // BTstack activated, get started if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING) { le_data_channel_client_start(); } else { state = TC_OFF; } break; case GAP_EVENT_ADVERTISING_REPORT: if (state != TC_W4_SCAN_RESULT) return; // check name in advertisement if (!advertisement_report_contains_name("LE Data Channel", packet)) return; // store address and type gap_event_advertising_report_get_address(packet, le_data_channel_addr); le_data_channel_addr_type = gap_event_advertising_report_get_address_type(packet); // stop scanning, and connect to the device state = TC_W4_CONNECT; gap_stop_scan(); printf("Stop scan. Connect to device with addr %s.\n", bd_addr_to_str(le_data_channel_addr)); gap_connect(le_data_channel_addr,le_data_channel_addr_type); break; case HCI_EVENT_LE_META: // wait for connection complete if (hci_event_le_meta_get_subevent_code(packet) != HCI_SUBEVENT_LE_CONNECTION_COMPLETE) break; if (state != TC_W4_CONNECT) return; connection_handle = hci_subevent_le_connection_complete_get_connection_handle(packet); // print connection parameters (without using float operations) conn_interval = hci_subevent_le_connection_complete_get_conn_interval(packet); printf("Connection Interval: %u.%02u ms\n", conn_interval * 125 / 100, 25 * (conn_interval & 3)); printf("Connection Latency: %u\n", hci_subevent_le_connection_complete_get_conn_latency(packet)); // initialize gatt client context with handle, and add it to the list of active clients // query primary services printf("Connect to performance test channel.\n"); state = TC_W4_CHANNEL; l2cap_le_create_channel(&packet_handler, connection_handle, TSPX_le_psm, data_channel_buffer, sizeof(data_channel_buffer), L2CAP_LE_AUTOMATIC_CREDITS, LEVEL_0, &le_data_channel_connection.cid); break; case HCI_EVENT_DISCONNECTION_COMPLETE: if (cmdline_addr_found){ printf("Disconnected %s\n", bd_addr_to_str(cmdline_addr)); return; } printf("Disconnected %s\n", bd_addr_to_str(le_data_channel_addr)); if (state == TC_OFF) break; le_data_channel_client_start(); break; case L2CAP_EVENT_LE_CHANNEL_OPENED: // inform about new l2cap connection l2cap_event_le_channel_opened_get_address(packet, event_address); psm = l2cap_event_le_channel_opened_get_psm(packet); cid = l2cap_event_le_channel_opened_get_local_cid(packet); handle = l2cap_event_le_channel_opened_get_handle(packet); if (packet[2] == 0) { printf("L2CAP: LE Data Channel successfully opened: %s, handle 0x%02x, psm 0x%02x, local cid 0x%02x, remote cid 0x%02x\n", bd_addr_to_str(event_address), handle, psm, cid, little_endian_read_16(packet, 15)); le_data_channel_connection.cid = cid; le_data_channel_connection.connection_handle = handle; le_data_channel_connection.test_data_len = btstack_min(l2cap_event_le_channel_opened_get_remote_mtu(packet), sizeof(le_data_channel_connection.test_data)); state = TC_TEST_DATA; printf("Test packet size: %u\n", le_data_channel_connection.test_data_len); test_reset(&le_data_channel_connection); #ifdef TEST_STREAM_DATA l2cap_le_request_can_send_now_event(le_data_channel_connection.cid); #endif } else { printf("L2CAP: LE Data Channel connection to device %s failed. status code %u\n", bd_addr_to_str(event_address), packet[2]); } break; #ifdef TEST_STREAM_DATA case L2CAP_EVENT_LE_CAN_SEND_NOW: streamer(); break; #endif case L2CAP_EVENT_LE_CHANNEL_CLOSED: cid = l2cap_event_le_channel_closed_get_local_cid(packet); printf("L2CAP: LE Data Channel closed 0x%02x\n", cid); break; default: break; } break; case L2CAP_DATA_PACKET: test_track_data(&le_data_channel_connection, size); break; default: break; } } #ifdef HAVE_BTSTACK_STDIN static void usage(const char *name){ fprintf(stderr, "Usage: %s [-a|--address aa:bb:cc:dd:ee:ff]\n", name); fprintf(stderr, "If no argument is provided, LE Data Channel Client will start scanning and connect to the first device named 'LE Data Channel'.\n"); fprintf(stderr, "To connect to a specific device use argument [-a].\n\n"); } #endif int btstack_main(int argc, const char * argv[]); int btstack_main(int argc, const char * argv[]){ #ifdef HAVE_BTSTACK_STDIN int arg = 1; cmdline_addr_found = 0; while (arg < argc) { if(!strcmp(argv[arg], "-a") || !strcmp(argv[arg], "--address")){ arg++; cmdline_addr_found = sscanf_bd_addr(argv[arg], cmdline_addr); arg++; if (!cmdline_addr_found) exit(1); continue; } usage(argv[0]); return 0; } #else (void)argc; (void)argv; #endif l2cap_init(); sm_init(); sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT); hci_event_callback_registration.callback = &packet_handler; hci_add_event_handler(&hci_event_callback_registration); // turn on! hci_power_control(HCI_POWER_ON); return 0; } /* EXAMPLE_END */