btstack/example/libusb/ble_client.c

/*
 * Copyright (C) 2011-2012 by Matthias Ringwald
 *
 * 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. This software may not be used in a commercial product
 *    without an explicit license granted by the copyright holder. 
 *
 * THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD 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.
 *
 */

//*****************************************************************************
//
// BLE Client
//
//*****************************************************************************

// TODO: seperate BR/EDR from LE ACL buffers
// TODO: move LE init into HCI
// ..

// NOTE: Supports only a single connection

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <btstack/run_loop.h>

#include "config.h"

#include "debug.h"
#include "btstack_memory.h"
#include "hci.h"
#include "hci_dump.h"

#include "l2cap.h"

#include "att.h"

// API

void gatt_client_init();
void gatt_client_start_scan();
// creates one event per found peripheral device
// EVENT: type (8), addr_type (8), addr(48), rssi(8), ad_len(8), ad_data(ad_len*8)
void gatt_client_stop_scan();

// END API

// gatt client state
static uint8_t requested_scan_state = 0;
static uint8_t scan_state = 0;


void gatt_client_init(){
    requested_scan_state = 0;
    scan_state = 0;
}

static void gatt_client_run(){
    if (!hci_can_send_packet_now(HCI_COMMAND_DATA_PACKET)) return;
    if (scan_state == requested_scan_state) return;
    
    if (requested_scan_state){
        printf("Starting scan...\n");
    } else {
        printf("Stopping scan...\n");                
    }

    hci_send_cmd(&hci_le_set_scan_enable, requested_scan_state, 0);
}

void gatt_client_start_scan(){
    requested_scan_state = 1;
    gatt_client_run();
}

void gatt_client_stop_scan(){
    requested_scan_state = 0;
    gatt_client_run();
}

static void packet_handler (void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
    switch (packet_type) {
            
		case HCI_EVENT_PACKET:
			switch (packet[0]) {
				
                case BTSTACK_EVENT_STATE:
					// bt stack activated, get started - set local name
					if (packet[2] == HCI_STATE_WORKING) {
                        printf("Working!\n");
                        gatt_client_start_scan();
                    }
					break;
                
                case HCI_EVENT_COMMAND_COMPLETE:
                    if (COMMAND_COMPLETE_EVENT(packet, hci_le_set_scan_enable)){
                        scan_state = requested_scan_state;
                    }
                    break;
                    
                case HCI_EVENT_LE_META:
                    switch (packet[2]) {
                        case HCI_SUBEVENT_LE_ADVERTISING_REPORT:
                            // reset connection MTU
                            printf("Received ad ...\n");
                            break;
                        default:
                            break;
                    }
                    break;

                default:
                    break;
			}
	}

    gatt_client_run();
}


void setup(void){
    /// GET STARTED with BTstack ///
    btstack_memory_init();
    run_loop_init(RUN_LOOP_POSIX);
        
    // use logger: format HCI_DUMP_PACKETLOGGER, HCI_DUMP_BLUEZ or HCI_DUMP_STDOUT
    hci_dump_open("/tmp/hci_dump.pklg", HCI_DUMP_PACKETLOGGER);

    // init HCI
    hci_transport_t    * transport = hci_transport_usb_instance();
    hci_uart_config_t  * config    = NULL;
    bt_control_t       * control   = NULL;
    remote_device_db_t * remote_db = (remote_device_db_t *) &remote_device_db_memory;
        
    hci_init(transport, config, control, remote_db);

    l2cap_init();
    //l2cap_register_fixed_channel(packet_handler, L2CAP_CID_ATTRIBUTE_PROTOCOL);
    l2cap_register_packet_handler(packet_handler);
}

// main == setup
int main(void)
{
    setup();

    // turn on!
    hci_power_control(HCI_POWER_ON);
    
    // go!
    run_loop_execute(); 
    
    // happy compiler!
    return 0;
}