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btstack/example/le_data_channel_client.c

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/*
* 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 <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#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<data_size && i<name_len;i++){
if (data[i] != name[i]) break;
}
// prefix match
return 1;
default:
break;
}
}
return 0;
}
#ifdef TEST_STREAM_DATA
/* LISTING_END */
/*
* @section Streamer
*
* @text The streamer function checks if notifications are enabled and if a notification can be sent now.
* It creates some test data - a single letter that gets increased every time - and tracks the data sent.
*/
/* LISTING_START(streamer): Streaming code */
static void streamer(void){
// create test data
le_data_channel_connection.counter++;
if (le_data_channel_connection.counter > '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 */
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