mirror of
https://github.com/bluekitchen/btstack.git
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261 lines
9.0 KiB
C
261 lines
9.0 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 MATTHIAS
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* RINGWALD 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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// *****************************************************************************
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/* EXAMPLE_START(le_streamer): LE Peripheral - Stream data over GATT
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*
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* @text All newer operating systems provide GATT Client functionality.
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* This example shows how to get a maximal throughput via BLE:
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* - send whenever possible
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* - use the max ATT MTU
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*
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* In theory, we should also update the connection parameters, but we already get
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* a connection interval of 30 ms and there's no public way to use a shorter
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* interval with iOS (if we're not implementing an HID device)
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*/
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// *****************************************************************************
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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-config.h"
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#include "run_loop.h"
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#include "classic/sdp_util.h"
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#include "debug.h"
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#include "btstack_memory.h"
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#include "hci.h"
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#include "hci_dump.h"
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#include "l2cap.h"
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#include "le_streamer.h"
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#include "ble/att.h"
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#include "ble/att_server.h"
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#include "ble/le_device_db.h"
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#include "ble/gap_le.h"
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#include "ble/sm.h"
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static int le_notification_enabled;
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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 int att_write_callback(uint16_t con_handle, uint16_t att_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size);
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static void streamer(void);
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const uint8_t adv_data[] = {
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// Flags general discoverable
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0x02, 0x01, 0x06,
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// Name
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0x0c, 0x09, 'L', 'E', ' ', 'S', 't', 'r', 'e', 'a', 'm', 'e', 'r',
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};
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const uint8_t adv_data_len = sizeof(adv_data);
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static int counter = 'A';
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static char test_data[200];
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static int test_data_len;
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static uint16_t conn_handle;
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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 $le_streamer.gatt$. Finally, it configures the advertisements
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* and boots the Bluetooth stack.
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*/
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/* LISTING_START(MainConfiguration): Init L2CAP, SM, ATT Server, and enable advertisements */
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static void le_streamer_setup(void){
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l2cap_init();
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// setup le device db
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le_device_db_init();
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// setup SM: Display only
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sm_init();
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// setup ATT server
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att_server_init(profile_data, NULL, att_write_callback);
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att_server_register_packet_handler(packet_handler);
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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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}
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/* LISTING_END */
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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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static uint32_t test_data_sent;
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static uint32_t test_data_start;
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static void test_reset(void){
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test_data_start = run_loop_get_time_ms();
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test_data_sent = 0;
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}
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static void test_track_sent(int bytes_sent){
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test_data_sent += test_data_len;
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// evaluate
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uint32_t now = run_loop_get_time_ms();
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uint32_t time_passed = now - 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 = test_data_sent * 1000 / time_passed;
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printf("%u bytes sent-> %u.%03u kB/s\n", test_data_sent, bytes_per_second / 1000, bytes_per_second % 1000);
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// restart
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test_data_start = now;
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test_data_sent = 0;
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}
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/* LISTING_END(tracking): Tracking throughput */
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/*
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* @section 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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int mtu;
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switch (packet_type) {
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case HCI_EVENT_PACKET:
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switch (packet[0]) {
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case HCI_EVENT_DISCONNECTION_COMPLETE:
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le_notification_enabled = 0;
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break;
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case HCI_EVENT_LE_META:
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switch (packet[2]) {
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case HCI_SUBEVENT_LE_CONNECTION_COMPLETE:
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test_data_len = ATT_DEFAULT_MTU - 3;
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conn_handle = READ_BT_16(packet, 4);
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// min con interval 20 ms
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// gap_request_connection_parameter_update(conn_handle, 0x10, 0x18, 0, 0x0048);
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// printf("Connected, requesting conn param update for handle 0x%04x\n", conn_handle);
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break;
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}
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break;
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case ATT_MTU_EXCHANGE_COMPLETE:
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mtu = READ_BT_16(packet, 4) - 3;
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printf("ATT MTU = %u\n", mtu);
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test_data_len = mtu - 3;
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break;
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}
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}
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// try sending whenever something happens
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streamer();
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}
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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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// check if we can send
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if (!le_notification_enabled) return;
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if (!att_server_can_send()) return;
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// create test data
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int i;
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counter++;
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if (counter > 'Z') counter = 'A';
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for (i=0;i<sizeof(test_data);i++){
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test_data[i] = counter;
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}
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// send
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att_server_notify(ATT_CHARACTERISTIC_0000FF11_0000_1000_8000_00805F9B34FB_01_VALUE_HANDLE, (uint8_t*) test_data, test_data_len);
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// track
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test_track_sent(test_data_len);
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}
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/* LISTING_END */
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/*
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* @section ATT Write
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*
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* @text The only valid ATT write in this example is to the Client Characteristic Configuration, which configures notification
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* and indication. If the ATT handle matches the client configuration handle, the new configuration value is stored and used
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* in the heartbeat handler to decide if a new value should be sent. See Listing attWrite.
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*/
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/* LISTING_START(attWrite): ATT Write */
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static int att_write_callback(uint16_t con_handle, uint16_t att_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size){
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if (att_handle != ATT_CHARACTERISTIC_0000FF11_0000_1000_8000_00805F9B34FB_01_CLIENT_CONFIGURATION_HANDLE) return 0;
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le_notification_enabled = READ_BT_16(buffer, 0) == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION;
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test_reset();
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return 0;
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}
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/* LISTING_END */
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int btstack_main(void);
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int btstack_main(void)
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{
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le_streamer_setup();
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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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