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389 lines
15 KiB
C
389 lines
15 KiB
C
/*
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* Copyright (C) 2018 BlueKitchen GmbH
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holders nor the names of
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* 4. Any redistribution, use, or modification is done solely for
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* personal benefit and not for any commercial purpose or for
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* monetary gain.
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*
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* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
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* GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Please inquire about commercial licensing options at
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* contact@bluekitchen-gmbh.com
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*
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*/
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#define BTSTACK_FILE__ "le_credit_based_flow_control_mode_client.c"
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// *****************************************************************************
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/* EXAMPLE_START(le_credit_based_flow_control_mode_client): LE Credit-Based Flow-Control Mode Client - Send Data over L2CAP
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*
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* @text Connects to 'LE CBM Server' and streams data
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* via L2CAP Channel in LE Credit-Based Flow-Control Mode (CBM)
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*/
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// *****************************************************************************
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#include <inttypes.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "btstack.h"
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#define TEST_STREAM_DATA
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#define TEST_PACKET_SIZE 1000
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static enum {
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TC_OFF,
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TC_IDLE,
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TC_W4_SCAN_RESULT,
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TC_W4_CONNECT,
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TC_W4_CHANNEL,
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TC_TEST_DATA
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} state = TC_OFF;
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const uint16_t TSPX_le_psm = 0x25;
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static bd_addr_t cmdline_addr;
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static int cmdline_addr_found = 0;
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// addr and type of device with correct name
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static bd_addr_t le_cbm_server_addr;
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static bd_addr_type_t le_cbm_server_addr_type;
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static hci_con_handle_t connection_handle;
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static btstack_packet_callback_registration_t hci_event_callback_registration;
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static btstack_packet_callback_registration_t sm_event_callback_registration;
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static uint8_t cbm_receive_buffer[TEST_PACKET_SIZE];
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/*
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* @section Track throughput
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* @text We calculate the throughput by setting a start time and measuring the amount of
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* data sent. After a configurable REPORT_INTERVAL_MS, we print the throughput in kB/s
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* and reset the counter and start time.
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*/
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/* LISTING_START(tracking): Tracking throughput */
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#define REPORT_INTERVAL_MS 3000
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// support for multiple clients
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typedef struct {
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char name;
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hci_con_handle_t connection_handle;
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uint16_t cid;
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int counter;
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char test_data[TEST_PACKET_SIZE];
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int test_data_len;
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uint32_t test_data_sent;
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uint32_t test_data_start;
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} le_cbm_connection_t;
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static le_cbm_connection_t le_cbm_connection;
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static void test_reset(le_cbm_connection_t * context){
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context->test_data_start = btstack_run_loop_get_time_ms();
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context->test_data_sent = 0;
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}
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static void test_track_data(le_cbm_connection_t * context, int bytes_transferred){
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context->test_data_sent += bytes_transferred;
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// evaluate
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uint32_t now = btstack_run_loop_get_time_ms();
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uint32_t time_passed = now - context->test_data_start;
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if (time_passed < REPORT_INTERVAL_MS) return;
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// print speed
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int bytes_per_second = context->test_data_sent * 1000 / time_passed;
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printf("%c: %"PRIu32" bytes -> %u.%03u kB/s\n", context->name, context->test_data_sent, bytes_per_second / 1000, bytes_per_second % 1000);
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// restart
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context->test_data_start = now;
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context->test_data_sent = 0;
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}
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/* LISTING_END(tracking): Tracking throughput */
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// returns true if name is found in advertisement
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static bool advertisement_report_contains_name(const char * name, uint8_t * advertisement_report){
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// get advertisement from report event
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const uint8_t * adv_data = gap_event_advertising_report_get_data(advertisement_report);
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uint8_t adv_len = gap_event_advertising_report_get_data_length(advertisement_report);
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uint16_t name_len = (uint16_t) strlen(name);
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// iterate over advertisement data
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ad_context_t context;
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for (ad_iterator_init(&context, adv_len, adv_data) ; ad_iterator_has_more(&context) ; ad_iterator_next(&context)){
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uint8_t data_type = ad_iterator_get_data_type(&context);
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uint8_t data_size = ad_iterator_get_data_len(&context);
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const uint8_t * data = ad_iterator_get_data(&context);
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switch (data_type){
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case BLUETOOTH_DATA_TYPE_SHORTENED_LOCAL_NAME:
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case BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME:
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// compare prefix
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if (data_size < name_len) break;
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if (memcmp(data, name, name_len) == 0) return true;
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break;
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default:
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break;
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}
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}
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return 0;
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}
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#ifdef TEST_STREAM_DATA
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/* LISTING_END */
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/*
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* @section Streamer
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*
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* @text The streamer function checks if notifications are enabled and if a notification can be sent now.
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* It creates some test data - a single letter that gets increased every time - and tracks the data sent.
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*/
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/* LISTING_START(streamer): Streaming code */
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static void streamer(void){
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// create test data
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le_cbm_connection.counter++;
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if (le_cbm_connection.counter > 'Z') le_cbm_connection.counter = 'A';
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memset(le_cbm_connection.test_data, le_cbm_connection.counter, le_cbm_connection.test_data_len);
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// send
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l2cap_send(le_cbm_connection.cid, (uint8_t *) le_cbm_connection.test_data, le_cbm_connection.test_data_len);
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// track
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test_track_data(&le_cbm_connection, le_cbm_connection.test_data_len);
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// request another packet
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l2cap_request_can_send_now_event(le_cbm_connection.cid);
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}
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/* LISTING_END */
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#endif
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// Either connect to remote specified on command line or start scan for device with "LE CBM Server" in advertisement
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static void le_cbm_client_start(void){
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if (cmdline_addr_found){
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printf("Connect to %s\n", bd_addr_to_str(cmdline_addr));
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state = TC_W4_CONNECT;
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gap_connect(cmdline_addr, 0);
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} else {
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printf("Start scanning!\n");
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state = TC_W4_SCAN_RESULT;
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gap_set_scan_parameters(0,0x0030, 0x0030);
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gap_start_scan();
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}
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}
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static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
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UNUSED(channel);
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UNUSED(size);
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bd_addr_t event_address;
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uint16_t psm;
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uint16_t cid;
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uint16_t conn_interval;
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hci_con_handle_t handle;
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uint8_t status;
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switch (packet_type) {
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case HCI_EVENT_PACKET:
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switch (hci_event_packet_get_type(packet)) {
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case BTSTACK_EVENT_STATE:
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// BTstack activated, get started
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if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING) {
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le_cbm_client_start();
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} else {
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state = TC_OFF;
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}
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break;
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case GAP_EVENT_ADVERTISING_REPORT:
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if (state != TC_W4_SCAN_RESULT) return;
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// check name in advertisement
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if (!advertisement_report_contains_name("LE CBM Server", packet)) return;
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// store address and type
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gap_event_advertising_report_get_address(packet, le_cbm_server_addr);
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le_cbm_server_addr_type = gap_event_advertising_report_get_address_type(packet);
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// stop scanning, and connect to the device
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state = TC_W4_CONNECT;
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gap_stop_scan();
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printf("Stop scan. Connect to device with addr %s.\n", bd_addr_to_str(le_cbm_server_addr));
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gap_connect(le_cbm_server_addr, le_cbm_server_addr_type);
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break;
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case HCI_EVENT_META_GAP:
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// wait for connection complete
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if (hci_event_gap_meta_get_subevent_code(packet) != GAP_SUBEVENT_LE_CONNECTION_COMPLETE) break;
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if (state != TC_W4_CONNECT) return;
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connection_handle = gap_subevent_le_connection_complete_get_connection_handle(packet);
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// print connection parameters (without using float operations)
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conn_interval = gap_subevent_le_connection_complete_get_conn_interval(packet);
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printf("Connection Interval: %u.%02u ms\n", conn_interval * 125 / 100, 25 * (conn_interval & 3));
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printf("Connection Latency: %u\n", gap_subevent_le_connection_complete_get_conn_latency(packet));
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// initialize gatt client context with handle, and add it to the list of active clients
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// query primary services
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printf("Connect to performance test service.\n");
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state = TC_W4_CHANNEL;
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l2cap_cbm_create_channel(&packet_handler, connection_handle, TSPX_le_psm, cbm_receive_buffer,
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sizeof(cbm_receive_buffer), L2CAP_LE_AUTOMATIC_CREDITS, LEVEL_0, &le_cbm_connection.cid);
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break;
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case HCI_EVENT_DISCONNECTION_COMPLETE:
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if (cmdline_addr_found){
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printf("Disconnected %s\n", bd_addr_to_str(cmdline_addr));
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return;
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}
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printf("Disconnected %s\n", bd_addr_to_str(le_cbm_server_addr));
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if (state == TC_OFF) break;
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le_cbm_client_start();
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break;
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case L2CAP_EVENT_CBM_CHANNEL_OPENED:
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// inform about new l2cap connection
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l2cap_event_cbm_channel_opened_get_address(packet, event_address);
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psm = l2cap_event_cbm_channel_opened_get_psm(packet);
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cid = l2cap_event_cbm_channel_opened_get_local_cid(packet);
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handle = l2cap_event_cbm_channel_opened_get_handle(packet);
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status = l2cap_event_cbm_channel_opened_get_status(packet);
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if (status == ERROR_CODE_SUCCESS) {
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printf("L2CAP: CBM Channel successfully opened: %s, handle 0x%04x, psm 0x%02x, local cid 0x%02x, remote cid 0x%02x\n",
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bd_addr_to_str(event_address), handle, psm, cid, little_endian_read_16(packet, 15));
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le_cbm_connection.cid = cid;
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le_cbm_connection.connection_handle = handle;
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le_cbm_connection.test_data_len = btstack_min(l2cap_event_cbm_channel_opened_get_remote_mtu(packet), sizeof(le_cbm_connection.test_data));
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state = TC_TEST_DATA;
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printf("Test packet size: %u\n", le_cbm_connection.test_data_len);
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test_reset(&le_cbm_connection);
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#ifdef TEST_STREAM_DATA
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l2cap_request_can_send_now_event(le_cbm_connection.cid);
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#endif
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} else {
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printf("L2CAP: Connection to device %s failed. status code 0x%02x\n", bd_addr_to_str(event_address), status);
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}
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break;
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#ifdef TEST_STREAM_DATA
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case L2CAP_EVENT_CAN_SEND_NOW:
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streamer();
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break;
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#endif
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case L2CAP_EVENT_CHANNEL_CLOSED:
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cid = l2cap_event_channel_closed_get_local_cid(packet);
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printf("L2CAP: Channel closed 0x%02x\n", cid);
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break;
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default:
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break;
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}
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break;
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case L2CAP_DATA_PACKET:
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test_track_data(&le_cbm_connection, size);
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break;
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default:
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break;
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}
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}
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/*
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* @section SM Packet Handler
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*
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* @text The packet handler is used to handle pairing requests
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*/
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static void sm_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
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UNUSED(channel);
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UNUSED(size);
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if (packet_type != HCI_EVENT_PACKET) return;
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switch (hci_event_packet_get_type(packet)) {
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case SM_EVENT_JUST_WORKS_REQUEST:
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printf("Just Works requested\n");
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sm_just_works_confirm(sm_event_just_works_request_get_handle(packet));
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break;
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case SM_EVENT_NUMERIC_COMPARISON_REQUEST:
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printf("Confirming numeric comparison: %"PRIu32"\n", sm_event_numeric_comparison_request_get_passkey(packet));
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sm_numeric_comparison_confirm(sm_event_passkey_display_number_get_handle(packet));
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break;
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case SM_EVENT_PASSKEY_DISPLAY_NUMBER:
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printf("Display Passkey: %"PRIu32"\n", sm_event_passkey_display_number_get_passkey(packet));
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break;
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default:
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break;
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}
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}
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#ifdef HAVE_BTSTACK_STDIN
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static void usage(const char *name){
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fprintf(stderr, "Usage: %s [-a|--address aa:bb:cc:dd:ee:ff]\n", name);
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fprintf(stderr, "If no argument is provided, LE CBM Client will start scanning and connect to the first device named 'LE CBM Server'.\n");
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fprintf(stderr, "To connect to a specific device use argument [-a].\n\n");
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}
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#endif
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int btstack_main(int argc, const char * argv[]);
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int btstack_main(int argc, const char * argv[]){
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#ifdef HAVE_BTSTACK_STDIN
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int arg;
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cmdline_addr_found = 0;
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for (arg = 1; arg < argc; arg++) {
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if(!strcmp(argv[arg], "-a") || !strcmp(argv[arg], "--address")){
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if (arg + 1 < argc) {
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arg++;
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cmdline_addr_found = sscanf_bd_addr(argv[arg], cmdline_addr);
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}
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if (!cmdline_addr_found) {
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usage(argv[0]);
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return 1;
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}
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}
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}
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if (!cmdline_addr_found) {
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fprintf(stderr, "No specific address specified or found; start scanning for 'LE Streamer' advertisement.\n");
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}
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#else
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(void)argc;
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(void)argv;
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#endif
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l2cap_init();
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sm_init();
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sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT);
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hci_event_callback_registration.callback = &packet_handler;
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hci_add_event_handler(&hci_event_callback_registration);
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sm_event_callback_registration.callback = &sm_packet_handler;
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sm_add_event_handler(&sm_event_callback_registration);
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// turn on!
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hci_power_control(HCI_POWER_ON);
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return 0;
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}
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/* EXAMPLE_END */
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