btstack/src/daemon.c

/*
 * Copyright (C) 2009-2012 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. 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 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.
 *
 * Please inquire about commercial licensing options at btstack@ringwald.ch
 *
 */

/*
 *  daemon.c
 *
 *  Created by Matthias Ringwald on 7/1/09.
 *
 *  BTstack background daemon
 *
 */

#include "config.h"

#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>

#include <getopt.h>

#include <btstack/btstack.h>
#include <btstack/linked_list.h>
#include <btstack/run_loop.h>

#include "debug.h"
#include "hci.h"
#include "hci_dump.h"
#include "hci_transport.h"
#include "l2cap.h"
#include "rfcomm.h"
#include "sdp.h"
#include "socket_connection.h"

#ifdef USE_BLUETOOL
#include <CoreFoundation/CoreFoundation.h>
#include "bt_control_iphone.h"
#include <notify.h>
#endif

#ifdef USE_SPRINGBOARD
#include "platform_iphone.h"
#endif

#ifdef HAVE_TRANSPORT_USB
#include <libusb-1.0/libusb.h>
#endif

#define DAEMON_NO_ACTIVE_CLIENT_TIMEOUT 10000


typedef struct {
    // linked list - assert: first field
    linked_item_t    item;
    
    // connection
    connection_t * connection;
    
    // power mode
    HCI_POWER_MODE power_mode;
    
    // discoverable
    uint8_t        discoverable;
    
} client_state_t;

// MARK: prototypes
static void dummy_bluetooth_status_handler(BLUETOOTH_STATE state);
static client_state_t * client_for_connection(connection_t *connection);
static int              clients_require_power_on(void);
static int              clients_require_discoverable(void);
static void              clients_clear_power_request(void);
static void start_power_off_timer(void);
static void stop_power_off_timer(void);

// MARK: globals
static hci_transport_t * transport;
static hci_uart_config_t config;
static timer_source_t timeout;
static uint8_t timeout_active = 0;
static int power_management_sleep = 0;
static linked_list_t    clients = NULL; // list of connected clients 
static void (*bluetooth_status_handler)(BLUETOOTH_STATE state) = dummy_bluetooth_status_handler;

static int global_enable = 0;

static remote_device_db_t const * remote_device_db = NULL;
static int rfcomm_channel_generator = 1;

static int loggingEnabled;

static void dummy_bluetooth_status_handler(BLUETOOTH_STATE state){
    log_info("Bluetooth status: %u\n", state);
};

static void daemon_no_connections_timeout(struct timer *ts){
    if (clients_require_power_on()) return;    // false alarm :)
    log_info("No active client connection for %u seconds -> POWER OFF\n", DAEMON_NO_ACTIVE_CLIENT_TIMEOUT/1000);
    hci_power_control(HCI_POWER_OFF);
}

static int btstack_command_handler(connection_t *connection, uint8_t *packet, uint16_t size){

    hci_dump_packet( HCI_COMMAND_DATA_PACKET, 1, packet, size);
    
    bd_addr_t addr;
    uint16_t cid;
    uint16_t psm;
    uint16_t service_channel;
    uint16_t mtu;
    uint8_t  reason;
    uint8_t  rfcomm_channel;
    uint8_t  rfcomm_credits;
    uint32_t service_record_handle;
    client_state_t *client;
    
    // BTstack internal commands - 16 Bit OpCode, 8 Bit ParamLen, Params...
    switch (READ_CMD_OCF(packet)){
        case BTSTACK_GET_STATE:
            hci_emit_state();
            break;
        case BTSTACK_SET_POWER_MODE:
            // track client power requests
            client = client_for_connection(connection);
            if (!client) break;
            client->power_mode = packet[3];
            // handle merged state
            if (!clients_require_power_on()){
                start_power_off_timer();
            } else if (!power_management_sleep) {
                stop_power_off_timer();
                hci_power_control(HCI_POWER_ON);
            }
            break;
        case BTSTACK_GET_VERSION:
            hci_emit_btstack_version();
            break;   
#ifdef USE_BLUETOOL
        case BTSTACK_SET_SYSTEM_BLUETOOTH_ENABLED:
            iphone_system_bt_set_enabled(packet[3]);
            hci_emit_system_bluetooth_enabled(iphone_system_bt_enabled());
            break;
            
        case BTSTACK_GET_SYSTEM_BLUETOOTH_ENABLED:
            hci_emit_system_bluetooth_enabled(iphone_system_bt_enabled());
            break;
#else
        case BTSTACK_SET_SYSTEM_BLUETOOTH_ENABLED:
        case BTSTACK_GET_SYSTEM_BLUETOOTH_ENABLED:
            hci_emit_system_bluetooth_enabled(0);
            break;
#endif
        case BTSTACK_SET_DISCOVERABLE:
            // track client discoverable requests
            client = client_for_connection(connection);
            if (!client) break;
            client->discoverable = packet[3];
            // merge state
            hci_discoverable_control(clients_require_discoverable());
            break;
        case BTSTACK_SET_BLUETOOTH_ENABLED:
            log_info("BTSTACK_SET_BLUETOOTH_ENABLED: %u\n", packet[3]);

            if (packet[3]) {
                // global enable
                global_enable = 1;
                hci_power_control(HCI_POWER_ON);
            } else {
                global_enable = 0;
                clients_clear_power_request();
                hci_power_control(HCI_POWER_OFF);
            }
            break;
        case L2CAP_CREATE_CHANNEL_MTU:
            bt_flip_addr(addr, &packet[3]);
            psm = READ_BT_16(packet, 9);
            mtu = READ_BT_16(packet, 11);
            l2cap_create_channel_internal( connection, NULL, addr, psm, mtu);
            break;
        case L2CAP_CREATE_CHANNEL:
            bt_flip_addr(addr, &packet[3]);
            psm = READ_BT_16(packet, 9);
            l2cap_create_channel_internal( connection, NULL, addr, psm, 150);   // until r865
            break;
        case L2CAP_DISCONNECT:
            cid = READ_BT_16(packet, 3);
            reason = packet[5];
            l2cap_disconnect_internal(cid, reason);
            break;
        case L2CAP_REGISTER_SERVICE:
            psm = READ_BT_16(packet, 3);
            mtu = READ_BT_16(packet, 5);
            l2cap_register_service_internal(connection, NULL, psm, mtu);
            break;
        case L2CAP_UNREGISTER_SERVICE:
            psm = READ_BT_16(packet, 3);
            l2cap_unregister_service_internal(connection, psm);
            break;
        case L2CAP_ACCEPT_CONNECTION:
            cid    = READ_BT_16(packet, 3);
            l2cap_accept_connection_internal(cid);
            break;
        case L2CAP_DECLINE_CONNECTION:
            cid    = READ_BT_16(packet, 3);
            reason = packet[7];
            l2cap_decline_connection_internal(cid, reason);
            break;
        case RFCOMM_CREATE_CHANNEL:
            bt_flip_addr(addr, &packet[3]);
            rfcomm_channel = packet[9];
            rfcomm_create_channel_internal( connection, &addr, rfcomm_channel );
            break;
        case RFCOMM_CREATE_CHANNEL_WITH_CREDITS:
            bt_flip_addr(addr, &packet[3]);
            rfcomm_channel = packet[9];
            rfcomm_credits = packet[10];
            rfcomm_create_channel_with_initial_credits_internal( connection, &addr, rfcomm_channel, rfcomm_credits );
            break;
        case RFCOMM_DISCONNECT:
            cid = READ_BT_16(packet, 3);
            reason = packet[5];
            rfcomm_disconnect_internal(cid);
            break;
        case RFCOMM_REGISTER_SERVICE:
            rfcomm_channel = packet[3];
            mtu = READ_BT_16(packet, 4);
            rfcomm_register_service_internal(connection, rfcomm_channel, mtu);
            break;
        case RFCOMM_REGISTER_SERVICE_WITH_CREDITS:
            rfcomm_channel = packet[3];
            mtu = READ_BT_16(packet, 4);
            rfcomm_credits = packet[6];
            rfcomm_register_service_with_initial_credits_internal(connection, rfcomm_channel, mtu, rfcomm_credits);
            break;
        case RFCOMM_UNREGISTER_SERVICE:
            service_channel = READ_BT_16(packet, 3);
            rfcomm_unregister_service_internal(service_channel);
            break;
        case RFCOMM_ACCEPT_CONNECTION:
            cid    = READ_BT_16(packet, 3);
            rfcomm_accept_connection_internal(cid);
            break;
        case RFCOMM_DECLINE_CONNECTION:
            cid    = READ_BT_16(packet, 3);
            reason = packet[7];
            rfcomm_decline_connection_internal(cid);
            break;            
        case RFCOMM_GRANT_CREDITS:
            cid    = READ_BT_16(packet, 3);
            rfcomm_credits = packet[5];
            rfcomm_grant_credits(cid, rfcomm_credits);
            break;
        case RFCOMM_PERSISTENT_CHANNEL: {
            if (remote_device_db) {
                // enforce \0
                packet[3+248] = 0;
                rfcomm_channel = remote_device_db->persistent_rfcomm_channel((char*)&packet[3]);
            } else {
                // NOTE: hack for non-iOS platforms
                rfcomm_channel = rfcomm_channel_generator++;
            }
            uint8_t event[4];
            event[0] = RFCOMM_EVENT_PERSISTENT_CHANNEL;
            event[1] = sizeof(event) - 2;
            event[2] = 0;
            event[3] = rfcomm_channel;
            hci_dump_packet(HCI_EVENT_PACKET, 0, event, sizeof(event));
            socket_connection_send_packet(connection, HCI_EVENT_PACKET, 0, (uint8_t *) event, sizeof(event));
            break;
        }
            
        case SDP_REGISTER_SERVICE_RECORD:
            log_info("SDP_REGISTER_SERVICE_RECORD size %u\n", size);
            sdp_register_service_internal(connection, &packet[3]);
            break;
        case SDP_UNREGISTER_SERVICE_RECORD:
            service_record_handle = READ_BT_32(packet, 3);
            sdp_unregister_service_internal(connection, service_record_handle);
            break;
        default:
            log_error("Error: command %u not implemented\n:", READ_CMD_OCF(packet));
            break;
    }
    return 0;
}

static int daemon_client_handler(connection_t *connection, uint16_t packet_type, uint16_t channel, uint8_t *data, uint16_t length){
    
    int err = 0;
    client_state_t * client;
    
    switch (packet_type){
        case HCI_COMMAND_DATA_PACKET:
            if (READ_CMD_OGF(data) != OGF_BTSTACK) { 
                // HCI Command
                hci_send_cmd_packet(data, length);
            } else {
                // BTstack command
                btstack_command_handler(connection, data, length);
            }
            break;
        case HCI_ACL_DATA_PACKET:
            err = hci_send_acl_packet(data, length);
            break;
        case L2CAP_DATA_PACKET:
            // process l2cap packet...
            err = l2cap_send_internal(channel, data, length);
            if (err == BTSTACK_ACL_BUFFERS_FULL) {
                l2cap_block_new_credits(1);
            }
            break;
        case RFCOMM_DATA_PACKET:
            // process l2cap packet...
            err = rfcomm_send_internal(channel, data, length);
            break;
        case DAEMON_EVENT_PACKET:
            switch (data[0]) {
                case DAEMON_EVENT_CONNECTION_OPENED:
                    log_info("DAEMON_EVENT_CONNECTION_OPENED %p\n",connection);

                    client = malloc(sizeof(client_state_t));
                    if (!client) break; // fail
                    client->connection   = connection;
                    client->power_mode   = HCI_POWER_OFF;
                    client->discoverable = 0;
                    linked_list_add(&clients, (linked_item_t *) client);
                    break;
                case DAEMON_EVENT_CONNECTION_CLOSED:
                    log_info("DAEMON_EVENT_CONNECTION_CLOSED %p\n",connection);
                    sdp_unregister_services_for_connection(connection);
                    rfcomm_close_connection(connection);
                    l2cap_close_connection(connection);
                    client = client_for_connection(connection);
                    if (!client) break;
                    linked_list_remove(&clients, (linked_item_t *) client);
                    free(client);
                    // update discoverable mode
                    hci_discoverable_control(clients_require_discoverable());
                    // start power off, if last active client
                    if (!clients_require_power_on()){
                        start_power_off_timer();
                    }
                    break;
                case DAEMON_NR_CONNECTIONS_CHANGED:
                    log_info("Nr Connections changed, new %u\n",data[1]);
                    break;
                default:
                    break;
            }
            break;
    }
    if (err) {
        log_info("Daemon Handler: err %d\n", err);
    }
    return err;
}


static void daemon_set_logging_enabled(int enabled){
    if (enabled && !loggingEnabled){
        // use logger: format HCI_DUMP_PACKETLOGGER, HCI_DUMP_BLUEZ or HCI_DUMP_STDOUT
        hci_dump_open("/tmp/hci_dump.pklg", HCI_DUMP_PACKETLOGGER);
    }
    if (!enabled && loggingEnabled){
        hci_dump_close();
    }
    loggingEnabled = enabled;
}

// local cache used to manage UI status
static HCI_STATE hci_state = HCI_STATE_OFF;
static int num_connections = 0;
static void update_ui_status(void){
    if (hci_state != HCI_STATE_WORKING) {
        bluetooth_status_handler(BLUETOOTH_OFF);
    } else {
        if (num_connections) {
            bluetooth_status_handler(BLUETOOTH_ACTIVE);
        } else {
            bluetooth_status_handler(BLUETOOTH_ON);
        }
    }
}

#ifdef USE_SPRINGBOARD
static void preferences_changed_callback(void){
    int logging = platform_iphone_logging_enabled();
    log_info("Logging enabled: %u\n", logging);
    daemon_set_logging_enabled(logging);
}
#endif

static void deamon_status_event_handler(uint8_t *packet, uint16_t size){
    
    uint8_t update_status = 0;
    
    // handle state event
    switch (packet[0]) {
        case BTSTACK_EVENT_STATE:
            hci_state = packet[2];
            log_info("New state: %u\n", hci_state);
            update_status = 1;
            break;
        case BTSTACK_EVENT_NR_CONNECTIONS_CHANGED:
            num_connections = packet[2];
            log_info("New nr connections: %u\n", num_connections);
            update_status = 1;
            break;
        default:
            break;
    }
    
    // choose full bluetooth state 
    if (update_status) {
        update_ui_status();
    }
}

static void daemon_retry_parked(void){
    
    // socket_connection_retry_parked is not reentrant
    static int retry_mutex = 0;

    // lock mutex
    if (retry_mutex) return;
    retry_mutex = 1;
    
    // ... try sending again  
    socket_connection_retry_parked();

    if (!socket_connection_has_parked_connections()){
        l2cap_block_new_credits(0);
    }

    // unlock mutex
    retry_mutex = 0;
}

static void daemon_packet_handler(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
    switch (packet_type) {
        case HCI_EVENT_PACKET:
            deamon_status_event_handler(packet, size);
            switch (packet[0]){
                case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:
                    // ACL buffer freed...
                    daemon_retry_parked();
                    // no need to tell clients
                    return;
                case RFCOMM_EVENT_CREDITS:
                    // RFCOMM CREDITS received...
                    daemon_retry_parked();
                    break;
                default:
                    break;
            }
        case DAEMON_EVENT_PACKET:
            switch (packet[0]){
                case DAEMON_EVENT_NEW_RFCOMM_CREDITS:
                    daemon_retry_parked();
                    break;
                default:
                    break;
            }
        default:
            break;
    }
    if (connection) {
        socket_connection_send_packet(connection, packet_type, channel, packet, size);
    } else {
        socket_connection_send_packet_all(packet_type, channel, packet, size);
    }
}


static void power_notification_callback(POWER_NOTIFICATION_t notification){
    switch (notification) {
        case POWER_WILL_SLEEP:
            // let's sleep
            power_management_sleep = 1;
            hci_power_control(HCI_POWER_SLEEP);
            break;
        case POWER_WILL_WAKE_UP:
            // assume that all clients use Bluetooth -> if connection, start Bluetooth
            power_management_sleep = 0;
            if (clients_require_power_on()) {
                hci_power_control(HCI_POWER_ON);
            }
            break;
        default:
            break;
    }
}

static void daemon_sigint_handler(int param){
    
#ifdef USE_BLUETOOL
    // notify daemons
    notify_post("ch.ringwald.btstack.stopped");
#endif
    
    log_info(" <= SIGINT received, shutting down..\n");    

    hci_power_control( HCI_POWER_OFF);
    hci_close();
    
    log_info("Good bye, see you.\n");    
    
    exit(0);
}



// MARK: manage power off timer

#define USE_POWER_OFF_TIMER

static void stop_power_off_timer(void){
#ifdef USE_POWER_OFF_TIMER
    if (timeout_active) {
        run_loop_remove_timer(&timeout);
        timeout_active = 0;
    }
#endif
}

static void start_power_off_timer(void){
#ifdef USE_POWER_OFF_TIMER    
    stop_power_off_timer();
    run_loop_set_timer(&timeout, DAEMON_NO_ACTIVE_CLIENT_TIMEOUT);
    run_loop_add_timer(&timeout);
    timeout_active = 1;
#else
    hci_power_control(HCI_POWER_OFF);
#endif
}

// MARK: manage list of clients


static client_state_t * client_for_connection(connection_t *connection) {
    linked_item_t *it;
    for (it = (linked_item_t *) clients; it ; it = it->next){
        client_state_t * client_state = (client_state_t *) it;
        if (client_state->connection == connection) {
            return client_state;
        }
    }
    return NULL;
}

static void clients_clear_power_request(void){
    linked_item_t *it;
    for (it = (linked_item_t *) clients; it ; it = it->next){
        client_state_t * client_state = (client_state_t *) it;
        client_state->power_mode = HCI_POWER_OFF;
    }
}

static int clients_require_power_on(void){
    
    if (global_enable) return 1;
    
    linked_item_t *it;
    for (it = (linked_item_t *) clients; it ; it = it->next){
        client_state_t * client_state = (client_state_t *) it;
        if (client_state->power_mode == HCI_POWER_ON) {
            return 1;
        }
    }
    return 0;
}

static int clients_require_discoverable(void){
    linked_item_t *it;
    for (it = (linked_item_t *) clients; it ; it = it->next){
        client_state_t * client_state = (client_state_t *) it;
        if (client_state->discoverable) {
            return 1;
        }
    }
    return 0;
}

static void usage(const char * name) {
    log_info("%s, BTstack background daemon\n", name);
    log_info("usage: %s [-h|--help] [--tcp]\n", name);
    log_info("    -h|--help  display this usage\n");
    log_info("    --tcp      use TCP server socket instead of local unix socket\n");
}

#ifdef USE_BLUETOOL 
static void * run_loop_thread(void *context){
    run_loop_execute();
    return NULL;
}
#endif

int main (int argc,  char * const * argv){
    
    static int tcp_flag = 0;
    
    while (1) {
        static struct option long_options[] = {
            { "tcp", no_argument, &tcp_flag, 1 },
            { "help", no_argument, 0, 0 },
            { 0,0,0,0 } // This is a filler for -1
        };
        
        int c;
        int option_index = -1;
        
        c = getopt_long(argc, argv, "h", long_options, &option_index);
        
        if (c == -1) break; // no more option
        
        // treat long parameter first
        if (option_index == -1) {
            switch (c) {
                case '?':
                case 'h':
                    usage(argv[0]);
                    return 0;
                    break;
            }
        } else {
            switch (option_index) {
                case 1:
                    usage(argv[0]);
                    return 0;
                    break;
            }
        }
    }
    
    // make stdout unbuffered
    setbuf(stdout, NULL);
    log_error("BTdaemon started\n");

    // handle CTRL-c
    signal(SIGINT, daemon_sigint_handler);
    // handle SIGTERM - suggested for launchd
    signal(SIGTERM, daemon_sigint_handler);
    // handle SIGPIPE
    struct sigaction act;
    act.sa_handler = SIG_IGN;
    sigemptyset (&act.sa_mask);
    act.sa_flags = 0;
    sigaction (SIGPIPE, &act, NULL);
    
    bt_control_t * control = NULL;
    
#ifdef HAVE_TRANSPORT_H4
    config.device_name   = UART_DEVICE;
    config.baudrate_init = UART_SPEED;
    config.baudrate_main = 0;
    config.flowcontrol = 1;
#if defined(USE_BLUETOOL) && defined(USE_POWERMANAGEMENT)
    if (bt_control_iphone_power_management_supported()){
        // use default (max) UART baudrate over netraph interface
        config.baudrate_init = 0;
        transport = hci_transport_h4_iphone_instance();
    } else {
        transport = hci_transport_h4_instance();
    }
#else
    transport = hci_transport_h4_instance();
#endif
#endif

#ifdef HAVE_TRANSPORT_USB
    transport = hci_transport_usb_instance();
#endif

#ifdef USE_BLUETOOL
    control = &bt_control_iphone;
#endif
    
#if defined(USE_BLUETOOL) && defined(USE_POWERMANAGEMENT)
    if (bt_control_iphone_power_management_supported()){
        hci_transport_h4_iphone_set_enforce_wake_device("/dev/btwake");
    }
#endif

#ifdef USE_SPRINGBOARD
    bluetooth_status_handler = platform_iphone_status_handler;
    platform_iphone_register_window_manager_restart(update_ui_status);
    platform_iphone_register_preferences_changed(preferences_changed_callback);
#endif
    
#ifdef REMOTE_DEVICE_DB
    remote_device_db = &REMOTE_DEVICE_DB;
#endif

    run_loop_init(RUN_LOOP_POSIX);
    
    // init power management notifications
    if (control && control->register_for_power_notifications){
        control->register_for_power_notifications(power_notification_callback);
    }

    // logging
    loggingEnabled = 0;
    int newLoggingEnabled = 1;
#ifdef USE_BLUETOOL
    // iPhone has toggle in Preferences.app
    newLoggingEnabled = platform_iphone_logging_enabled();
#endif
    daemon_set_logging_enabled(newLoggingEnabled);
    
    // init HCI
    hci_init(transport, &config, control, remote_device_db);
    
    // init L2CAP
    l2cap_init();
    l2cap_register_packet_handler(daemon_packet_handler);
    timeout.process = daemon_no_connections_timeout;

#ifdef HAVE_RFCOMM
    log_info("config.h: HAVE_RFCOMM\n");
    rfcomm_init();
    rfcomm_register_packet_handler(daemon_packet_handler);
#endif
    
#ifdef HAVE_SDP
    sdp_init();
    sdp_register_packet_handler(daemon_packet_handler);
#endif
    
#ifdef USE_LAUNCHD
    socket_connection_create_launchd();
#else
    // create server
    if (tcp_flag) {
        socket_connection_create_tcp(BTSTACK_PORT);
    } else {
        socket_connection_create_unix(BTSTACK_UNIX);
    }
#endif
    socket_connection_register_packet_callback(daemon_client_handler);
        
#ifdef USE_BLUETOOL 
    // notify daemons
    notify_post("ch.ringwald.btstack.started");

    // spawn thread to have BTstack run loop on new thread, while main thread is used to keep CFRunLoop
    pthread_t run_loop;
    pthread_create(&run_loop, NULL, &run_loop_thread, NULL);

    // needed to receive notifications
    CFRunLoopRun();
#endif
    
    // go!
    run_loop_execute();
    return 0;
}