mirror of
https://github.com/bluekitchen/btstack.git
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366 lines
15 KiB
C
366 lines
15 KiB
C
/*
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* Copyright (C) 2014 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_server.c"
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// *****************************************************************************
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/* EXAMPLE_START(le_credit_based_flow_control_mode_server): LE Credit-Based Flow-Control Mode Server - Receive data over L2CAP
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*
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* @text iOS 11 and newer supports L2CAP channels in LE Credit-Based Flow-Control Mode for fast transfer over LE
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* [https://github.com/bluekitchen/CBL2CAPChannel-Demo](Basic iOS example on GitHub)
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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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#include "le_credit_based_flow_control_mode_server.h"
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// #define TEST_STREAM_DATA
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#define TEST_PACKET_SIZE 1000
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#define REPORT_INTERVAL_MS 3000
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#define MAX_NR_CONNECTIONS 3
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const uint16_t TSPX_le_psm = 0x25;
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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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static void sm_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
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const uint8_t adv_data[] = {
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// Flags general discoverable, BR/EDR not supported
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0x02, 0x01, 0x06,
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// Name
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0x0E, 0x09, 'L', 'E', ' ', 'C', 'B', 'M', ' ', 'S', 'e', 'r', 'v', 'e', 'r',
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};
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const uint8_t adv_data_len = sizeof(adv_data);
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static btstack_packet_callback_registration_t hci_event_callback_registration;
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static btstack_packet_callback_registration_t l2cap_event_callback_registration;
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static btstack_packet_callback_registration_t sm_event_callback_registration;
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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 uint16_t initial_credits = L2CAP_LE_AUTOMATIC_CREDITS;
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static uint8_t data_channel_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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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 sent-> %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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#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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if (le_cbm_connection.cid == 0) return;
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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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/*
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* @section HCI + L2CAP Packet Handler
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*
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* @text The packet handler is used to stop the notifications and reset the MTU on connect
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* It would also be a good place to request the connection parameter update as indicated
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* in the commented code block.
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*/
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/* LISTING_START(packetHandler): Packet Handler */
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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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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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printf("To start streaming, please run the le_credit_based_flow_control_mode_client example on other device.\n");
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}
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break;
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case HCI_EVENT_DISCONNECTION_COMPLETE:
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// free connection
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printf("%c: Disconnect, reason 0x%02x\n", le_cbm_connection.name, hci_event_disconnection_complete_get_reason(packet));
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le_cbm_connection.connection_handle = HCI_CON_HANDLE_INVALID;
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break;
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case HCI_EVENT_META_GAP:
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switch (hci_event_gap_meta_get_subevent_code(packet)) {
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case GAP_SUBEVENT_LE_CONNECTION_COMPLETE:
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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("%c: Connection Interval: %u.%02u ms\n", le_cbm_connection.name, conn_interval * 125 / 100, 25 * (conn_interval & 3));
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printf("%c: Connection Latency: %u\n", le_cbm_connection.name, gap_subevent_le_connection_complete_get_conn_latency(packet));
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// min con interval 15 ms - supported from iOS 11
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gap_request_connection_parameter_update(le_cbm_connection.connection_handle, 12, 12, 4, 0x0048);
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printf("Connected, requesting conn param update for handle 0x%04x\n", le_cbm_connection.connection_handle);
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//
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test_reset(&le_cbm_connection);
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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 HCI_EVENT_LE_META:
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switch (hci_event_le_meta_get_subevent_code(packet)) {
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case HCI_SUBEVENT_LE_CONNECTION_UPDATE_COMPLETE:
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// print connection parameters (without using float operations)
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conn_interval = hci_subevent_le_connection_update_complete_get_conn_interval(packet);
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printf("LE Connection Update:\n");
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printf("%c: Connection Interval: %u.%02u ms\n", le_cbm_connection.name, conn_interval * 125 / 100, 25 * (conn_interval & 3));
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printf("%c: Connection Latency: %u\n", le_cbm_connection.name, hci_subevent_le_connection_update_complete_get_conn_latency(packet));
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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_EVENT_CONNECTION_PARAMETER_UPDATE_RESPONSE:
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printf("L2CAP Connection Parameter Update Complete, result: 0x%02x\n", l2cap_event_connection_parameter_update_response_get_result(packet));
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break;
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// LE Credit-based Flow-Control Mode
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case L2CAP_EVENT_CBM_INCOMING_CONNECTION:
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psm = l2cap_event_cbm_incoming_connection_get_psm(packet);
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cid = l2cap_event_cbm_incoming_connection_get_local_cid(packet);
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if (psm != TSPX_le_psm) break;
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printf("L2CAP: Accepting incoming connection request for 0x%02x, PSM %02x\n", cid, psm);
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l2cap_cbm_accept_connection(cid, data_channel_buffer, sizeof(data_channel_buffer), initial_credits);
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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: 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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// setup new
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le_cbm_connection.counter = 'A';
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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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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 0x%02x\n", bd_addr_to_str(event_address), status);
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}
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break;
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case L2CAP_EVENT_CHANNEL_CLOSED:
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printf("L2CAP: Channel closed\n");
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le_cbm_connection.cid = 0;
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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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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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/* @section Main Application Setup
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*
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* @text Listing MainConfiguration shows main application code.
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* It initializes L2CAP, the Security Manager, and configures the ATT Server with the pre-compiled
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* ATT Database generated from $le_credit_based_flow_control_mode_server.gatt$. Finally, it configures the advertisements
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* and boots the Bluetooth stack.
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*/
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int btstack_main(void);
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int btstack_main(void)
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{
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l2cap_init();
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// setup SM: Display only
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sm_init();
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// setup ATT server: iOS disconnects if ATT MTU Exchange fails
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att_server_init(profile_data, NULL, NULL);
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// register for HCI events
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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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// register for SM events
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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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// register for L2CAP events
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l2cap_event_callback_registration.callback = &packet_handler;
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l2cap_add_event_handler(&l2cap_event_callback_registration);
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// le data channel setup
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l2cap_cbm_register_service(&packet_handler, TSPX_le_psm, LEVEL_0);
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// setup advertisements
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uint16_t adv_int_min = 0x0030;
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uint16_t adv_int_max = 0x0030;
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uint8_t adv_type = 0;
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bd_addr_t null_addr;
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memset(null_addr, 0, 6);
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gap_advertisements_set_params(adv_int_min, adv_int_max, adv_type, 0, null_addr, 0x07, 0x00);
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gap_advertisements_set_data(adv_data_len, (uint8_t *) adv_data);
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gap_advertisements_enable(1);
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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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