xref: /btstack/example/hfp_ag_demo.c (revision bdb44bd96ae543c7a3d46ba439628bc6db6be702)

/*
 * Copyright (C) 2014 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
 * [email protected]
 *
 */

/*
 * hfp_ag_demo.c
 */

// *****************************************************************************
/* EXAMPLE_START(hfp_ag_demo): HFP Audio Gateway (AG) Demo
 *
 * @text This HFP Audio Gateway example demonstrates how to receive
 * an output from a remote HFP Hands-Free (HF) unit, and,
 * if HAVE_POSIX_STDIN is defined, how to control the HFP HF.
 */
// *****************************************************************************


#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "btstack.h"
#ifdef HAVE_POSIX_STDIN
#include "stdin_support.h"
#endif


static int phase = 0;

// input signal: pre-computed sine wave, 160 Hz
static const uint8_t sine[] = {
      0,  15,  31,  46,  61,  74,  86,  97, 107, 114,
    120, 124, 126, 126, 124, 120, 114, 107,  97,  86,
     74,  61,  46,  31,  15,   0, 241, 225, 210, 195,
    182, 170, 159, 149, 142, 136, 132, 130, 130, 132,
    136, 142, 149, 159, 170, 182, 195, 210, 225, 241,
};

uint8_t hfp_service_buffer[150];
const uint8_t    rfcomm_channel_nr = 1;
const char hfp_ag_service_name[] = "BTstack HFP AG Test";

// PTS
// static bd_addr_t device_addr = {0x00,0x15,0x83,0x5F,0x9D,0x46};
// BT-201
static bd_addr_t device_addr = {0x00, 0x07, 0xB0, 0x83, 0x02, 0x5E};

static uint8_t codecs[1] = {HFP_CODEC_CVSD};
static uint16_t handle = -1;
static hci_con_handle_t sco_handle;
static int memory_1_enabled = 1;

static int ag_indicators_nr = 7;
static hfp_ag_indicator_t ag_indicators[] = {
    // index, name, min range, max range, status, mandatory, enabled, status changed
    {1, "service",   0, 1, 1, 0, 0, 0},
    {2, "call",      0, 1, 0, 1, 1, 0},
    {3, "callsetup", 0, 3, 0, 1, 1, 0},
    {4, "battchg",   0, 5, 3, 0, 0, 0},
    {5, "signal",    0, 5, 5, 0, 1, 0},
    {6, "roam",      0, 1, 0, 0, 1, 0},
    {7, "callheld",  0, 2, 0, 1, 1, 0}
};

static int call_hold_services_nr = 5;
static const char* call_hold_services[] = {"1", "1x", "2", "2x", "3"};

static int hf_indicators_nr = 2;
static hfp_generic_status_indicator_t hf_indicators[] = {
    {1, 1},
    {2, 1},
};

char cmd;

// GAP INQUIRY

#define MAX_DEVICES 10
enum DEVICE_STATE { REMOTE_NAME_REQUEST, REMOTE_NAME_INQUIRED, REMOTE_NAME_FETCHED };
struct device {
    bd_addr_t  address;
    uint16_t   clockOffset;
    uint32_t   classOfDevice;
    uint8_t    pageScanRepetitionMode;
    uint8_t    rssi;
    enum DEVICE_STATE  state;
};

#define INQUIRY_INTERVAL 5
struct device devices[MAX_DEVICES];
int deviceCount = 0;


enum STATE {INIT, W4_INQUIRY_MODE_COMPLETE, ACTIVE} ;
enum STATE state = INIT;


static int getDeviceIndexForAddress( bd_addr_t addr){
    int j;
    for (j=0; j< deviceCount; j++){
        if (bd_addr_cmp(addr, devices[j].address) == 0){
            return j;
        }
    }
    return -1;
}

#ifdef HAVE_POSIX_STDIN
static void start_scan(void){
    printf("Starting inquiry scan..\n");
    hci_send_cmd(&hci_inquiry, HCI_INQUIRY_LAP, INQUIRY_INTERVAL, 0);
}
#endif

static int has_more_remote_name_requests(void){
    int i;
    for (i=0;i<deviceCount;i++) {
        if (devices[i].state == REMOTE_NAME_REQUEST) return 1;
    }
    return 0;
}

static void do_next_remote_name_request(void){
    int i;
    for (i=0;i<deviceCount;i++) {
        // remote name request
        if (devices[i].state == REMOTE_NAME_REQUEST){
            devices[i].state = REMOTE_NAME_INQUIRED;
            printf("Get remote name of %s...\n", bd_addr_to_str(devices[i].address));
            hci_send_cmd(&hci_remote_name_request, devices[i].address,
                        devices[i].pageScanRepetitionMode, 0, devices[i].clockOffset | 0x8000);
            return;
        }
    }
}

static void continue_remote_names(void){
    // don't get remote names for testing
    if (has_more_remote_name_requests()){
        do_next_remote_name_request();
        return;
    }
    // try to find PTS
    int i;
    for (i=0;i<deviceCount;i++){
        if (memcmp(devices[i].address, device_addr, 6) == 0){
            printf("Inquiry scan over, successfully found PTS at index %u\nReady to connect to it.\n", i);
            return;
        }
    }
    printf("Inquiry scan over but PTS not found :(\n");
}

static void inquiry_packet_handler (uint8_t packet_type, uint8_t *packet, uint16_t size){
    bd_addr_t addr;
    int i;
    int numResponses;
    int index;

    // printf("packet_handler: pt: 0x%02x, packet[0]: 0x%02x\n", packet_type, packet[0]);
    if (packet_type != HCI_EVENT_PACKET) return;

    uint8_t event = packet[0];

    switch(event){
        case HCI_EVENT_INQUIRY_RESULT:
        case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:{
            numResponses = hci_event_inquiry_result_get_num_responses(packet);
            int offset = 3;
            for (i=0; i<numResponses && deviceCount < MAX_DEVICES;i++){
                reverse_bd_addr(&packet[offset], addr);
                offset += 6;
                index = getDeviceIndexForAddress(addr);
                if (index >= 0) continue;   // already in our list
                memcpy(devices[deviceCount].address, addr, 6);

                devices[deviceCount].pageScanRepetitionMode = packet[offset];
                offset += 1;

                if (event == HCI_EVENT_INQUIRY_RESULT){
                    offset += 2; // Reserved + Reserved
                    devices[deviceCount].classOfDevice = little_endian_read_24(packet, offset);
                    offset += 3;
                    devices[deviceCount].clockOffset =   little_endian_read_16(packet, offset) & 0x7fff;
                    offset += 2;
                    devices[deviceCount].rssi  = 0;
                } else {
                    offset += 1; // Reserved
                    devices[deviceCount].classOfDevice = little_endian_read_24(packet, offset);
                    offset += 3;
                    devices[deviceCount].clockOffset =   little_endian_read_16(packet, offset) & 0x7fff;
                    offset += 2;
                    devices[deviceCount].rssi  = packet[offset];
                    offset += 1;
                }
                devices[deviceCount].state = REMOTE_NAME_REQUEST;
                printf("Device #%u found: %s with COD: 0x%06x, pageScan %d, clock offset 0x%04x, rssi 0x%02x\n",
                    deviceCount, bd_addr_to_str(addr),
                    devices[deviceCount].classOfDevice, devices[deviceCount].pageScanRepetitionMode,
                    devices[deviceCount].clockOffset, devices[deviceCount].rssi);
                deviceCount++;
            }

            break;
        }
        case HCI_EVENT_INQUIRY_COMPLETE:
            for (i=0;i<deviceCount;i++) {
                // retry remote name request
                if (devices[i].state == REMOTE_NAME_INQUIRED)
                    devices[i].state = REMOTE_NAME_REQUEST;
            }
            continue_remote_names();
            break;

        case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE:
            reverse_bd_addr(&packet[3], addr);
            index = getDeviceIndexForAddress(addr);
            if (index >= 0) {
                if (packet[2] == 0) {
                    printf("Name: '%s'\n", &packet[9]);
                    devices[index].state = REMOTE_NAME_FETCHED;
                } else {
                    printf("Failed to get name: page timeout\n");
                }
            }
            continue_remote_names();
            break;

        default:
            break;
    }
}
// GAP INQUIRY END
#ifdef HAVE_POSIX_STDIN

// prototypes
static void show_usage(void);

// Testig User Interface
static void show_usage(void){
    bd_addr_t iut_address;
    gap_local_bd_addr(iut_address);

    printf("\n--- Bluetooth HFP Audiogateway (AG) unit Test Console %s ---\n", bd_addr_to_str(iut_address));
    printf("---\n");

    printf("a - establish HFP connection to PTS module %s\n", bd_addr_to_str(device_addr));
    // printf("A - release HFP connection to PTS module\n");

    printf("b - establish AUDIO connection\n");
    printf("B - release AUDIO connection\n");

    printf("c - simulate incoming call from 1234567\n");
    printf("C - simulate call from 1234567 dropped\n");

    printf("d - report AG failure\n");

    printf("e - answer call on AG\n");
    printf("E - reject call on AG\n");

    printf("r - disable in-band ring tone\n");
    printf("R - enable in-band ring tone\n");

    printf("f - Disable cellular network\n");
    printf("F - Enable cellular network\n");

    printf("g - Set signal strength to 0\n");
    printf("G - Set signal strength to 5\n");

    printf("h - Disable roaming\n");
    printf("H - Enable roaming\n");

    printf("i - Set battery level to 3\n");
    printf("I - Set battery level to 5\n");

    printf("j - Answering call on remote side\n");

    printf("k - Clear memory #1\n");
    printf("K - Set memory #1\n");

    printf("l - Clear last number\n");
    printf("L - Set last number\n");

    printf("m - simulate incoming call from 7654321\n");
    // printf("M - simulate call from 7654321 dropped\n");

    printf("n - Disable Voice Regocnition\n");
    printf("N - Enable Voice Recognition\n");

    printf("o - Set speaker volume to 0  (minimum)\n");
    printf("O - Set speaker volume to 9  (default)\n");
    printf("p - Set speaker volume to 12 (higher)\n");
    printf("P - Set speaker volume to 15 (maximum)\n");

    printf("q - Set microphone gain to 0  (minimum)\n");
    printf("Q - Set microphone gain to 9  (default)\n");
    printf("s - Set microphone gain to 12 (higher)\n");
    printf("S - Set microphone gain to 15 (maximum)\n");

    printf("t - terminate connection\n");
    printf("u - join held call\n");
    printf("v - discover nearby HF units\n");
    printf("w - put incoming call on hold (Response and Hold)\n");
    printf("x - accept held incoming call (Response and Hold)\n");
    printf("X - reject held incoming call (Response and Hold)\n");

    printf("---\n");
    printf("Ctrl-c - exit\n");
    printf("---\n");
}

static void stdin_process(btstack_data_source_t *ds, btstack_data_source_callback_type_t callback_type){
    read(ds->fd, &cmd, 1);
    switch (cmd){
        case 'a':
            log_info("USER:\'%c\'", cmd);
            printf("Establish HFP service level connection to PTS module %s...\n", bd_addr_to_str(device_addr));
            hfp_ag_establish_service_level_connection(device_addr);
            break;
        case 'A':
            log_info("USER:\'%c\'", cmd);
            printf("Release HFP service level connection.\n");
            hfp_ag_release_service_level_connection(device_addr);
            break;
        case 'Z':
            log_info("USER:\'%c\'", cmd);
            printf("Release HFP service level connection to %s...\n", bd_addr_to_str(device_addr));
            hfp_ag_release_service_level_connection(device_addr);
            break;
        case 'b':
            log_info("USER:\'%c\'", cmd);
            printf("Establish Audio connection %s...\n", bd_addr_to_str(device_addr));
            hfp_ag_establish_audio_connection(device_addr);
            break;
        case 'B':
            log_info("USER:\'%c\'", cmd);
            printf("Release Audio connection.\n");
            hfp_ag_release_audio_connection(device_addr);
            break;
        case 'c':
            log_info("USER:\'%c\'", cmd);
            printf("Simulate incoming call from 1234567\n");
            hfp_ag_set_clip(129, "1234567");
            hfp_ag_incoming_call();
            break;
        case 'm':
            log_info("USER:\'%c\'", cmd);
            printf("Simulate incoming call from 7654321\n");
            hfp_ag_set_clip(129, "7654321");
            hfp_ag_incoming_call();
            break;
        case 'C':
            log_info("USER:\'%c\'", cmd);
            printf("Simulate terminate call\n");
            hfp_ag_call_dropped();
            break;
        case 'd':
            log_info("USER:\'%c\'", cmd);
            printf("Report AG failure\n");
            hfp_ag_report_extended_audio_gateway_error_result_code(device_addr, HFP_CME_ERROR_AG_FAILURE);
            break;
        case 'e':
            log_info("USER:\'%c\'", cmd);
            printf("Answer call on AG\n");
            hfp_ag_answer_incoming_call();
            break;
        case 'E':
            log_info("USER:\'%c\'", cmd);
            printf("Reject call on AG\n");
            hfp_ag_terminate_call();
            break;
        case 'f':
            log_info("USER:\'%c\'", cmd);
            printf("Disable cellular network\n");
            hfp_ag_set_registration_status(0);
            break;
        case 'F':
            log_info("USER:\'%c\'", cmd);
            printf("Enable cellular network\n");
            hfp_ag_set_registration_status(1);
            break;
        case 'g':
            log_info("USER:\'%c\'", cmd);
            printf("Set signal strength to 0\n");
            hfp_ag_set_signal_strength(0);
            break;
        case 'G':
            log_info("USER:\'%c\'", cmd);
            printf("Set signal strength to 5\n");
            hfp_ag_set_signal_strength(5);
            break;
        case 'h':
            log_info("USER:\'%c\'", cmd);
            printf("Disable roaming\n");
            hfp_ag_set_roaming_status(0);
            break;
        case 'H':
            log_info("USER:\'%c\'", cmd);
            printf("Enable roaming\n");
            hfp_ag_set_roaming_status(1);
            break;
        case 'i':
            log_info("USER:\'%c\'", cmd);
            printf("Set battery level to 3\n");
            hfp_ag_set_battery_level(3);
            break;
        case 'I':
            log_info("USER:\'%c\'", cmd);
            printf("Set battery level to 5\n");
            hfp_ag_set_battery_level(5);
            break;
        case 'j':
            log_info("USER:\'%c\'", cmd);
            printf("Answering call on remote side\n");
            hfp_ag_outgoing_call_established();
            break;
        case 'r':
            log_info("USER:\'%c\'", cmd);
            printf("Disable in-band ring tone\n");
            hfp_ag_set_use_in_band_ring_tone(0);
            break;
        case 'k':
            log_info("USER:\'%c\'", cmd);
            printf("Memory 1 cleared\n");
            memory_1_enabled = 0;
            break;
        case 'K':
            log_info("USER:\'%c\'", cmd);
            printf("Memory 1 set\n");
            memory_1_enabled = 1;
            break;
        case 'l':
            log_info("USER:\'%c\'", cmd);
            printf("Last dialed number cleared\n");
            hfp_ag_clear_last_dialed_number();
            break;
        case 'L':
            log_info("USER:\'%c\'", cmd);
            printf("Outgoing call connected, ringing\n");
            hfp_ag_outgoing_call_ringing();
            break;
        case 'n':
            log_info("USER:\'%c\'", cmd);
            printf("Disable Voice Recognition\n");
            hfp_ag_activate_voice_recognition(device_addr, 0);
            break;
        case 'N':
            log_info("USER:\'%c\'", cmd);
            printf("Enable Voice Recognition\n");
            hfp_ag_activate_voice_recognition(device_addr, 1);
            break;
        case 'o':
            log_info("USER:\'%c\'", cmd);
            printf("Set speaker gain to 0 (minimum)\n");
            hfp_ag_set_speaker_gain(device_addr, 0);
            break;
        case 'O':
            log_info("USER:\'%c\'", cmd);
            printf("Set speaker gain to 9 (default)\n");
            hfp_ag_set_speaker_gain(device_addr, 9);
            break;
        case 'p':
            log_info("USER:\'%c\'", cmd);
            printf("Set speaker gain to 12 (higher)\n");
            hfp_ag_set_speaker_gain(device_addr, 12);
            break;
        case 'P':
            log_info("USER:\'%c\'", cmd);
            printf("Set speaker gain to 15 (maximum)\n");
            hfp_ag_set_speaker_gain(device_addr, 15);
            break;
        case 'q':
            log_info("USER:\'%c\'", cmd);
            printf("Set microphone gain to 0\n");
            hfp_ag_set_microphone_gain(device_addr, 0);
            break;
        case 'Q':
            log_info("USER:\'%c\'", cmd);
            printf("Set microphone gain to 9\n");
            hfp_ag_set_microphone_gain(device_addr, 9);
            break;
        case 's':
            log_info("USER:\'%c\'", cmd);
            printf("Set microphone gain to 12\n");
            hfp_ag_set_microphone_gain(device_addr, 12);
            break;
        case 'S':
            log_info("USER:\'%c\'", cmd);
            printf("Set microphone gain to 15\n");
            hfp_ag_set_microphone_gain(device_addr, 15);
            break;
        case 'R':
            log_info("USER:\'%c\'", cmd);
            printf("Enable in-band ring tone\n");
            hfp_ag_set_use_in_band_ring_tone(1);
            break;
        case 't':
            log_info("USER:\'%c\'", cmd);
            printf("Terminate HCI connection. 0x%2x\n", handle);
            gap_disconnect(handle);
            break;
        case 'u':
            log_info("USER:\'%c\'", cmd);
            printf("Join held call\n");
            hfp_ag_join_held_call();
            break;
        case 'v':
            start_scan();
            break;
        case 'w':
            log_info("USER:\'%c\'", cmd);
            printf("AG: Put incoming call on hold (Response and Hold)\n");
            hfp_ag_hold_incoming_call();
            break;
        case 'x':
            log_info("USER:\'%c\'", cmd);
            printf("AG: Accept held incoming call (Response and Hold)\n");
            hfp_ag_accept_held_incoming_call();
            break;
        case 'X':
            log_info("USER:\'%c\'", cmd);
            printf("AG: Reject held incoming call (Response and Hold)\n");
            hfp_ag_reject_held_incoming_call();
            break;
        default:
            show_usage();
            break;
    }
}
#endif

#define SCO_REPORT_PERIOD 100
static void send_sco_data(void){
    if (!sco_handle) return;

    const int sco_packet_length = hci_get_sco_packet_length();
    const int sco_payload_length = sco_packet_length - 3;
    const int frames_per_packet = sco_payload_length;    // for 8-bit data. for 16-bit data it's /2

    hci_reserve_packet_buffer();
    uint8_t * sco_packet = hci_get_outgoing_packet_buffer();
    // set handle + flags
    little_endian_store_16(sco_packet, 0, sco_handle);
    // set len
    sco_packet[2] = sco_payload_length;
    int i;
    for (i=0;i<frames_per_packet;i++){
        sco_packet[3+i] = sine[phase];
        phase++;
        if (phase >= sizeof(sine)) phase = 0;
    }
    hci_send_sco_packet_buffer(sco_packet_length);

    // request another send event
    hci_request_sco_can_send_now_event();

    static int count = 0;
    count++;
    if ((count % SCO_REPORT_PERIOD) == 0) printf("Sent %u\n", count);
}

static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t * event, uint16_t event_size){
    switch (packet_type){
        case HCI_EVENT_PACKET:
            switch (event[0]){
                case HCI_EVENT_INQUIRY_RESULT:
                case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:
                case HCI_EVENT_INQUIRY_COMPLETE:
                case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE:
                    inquiry_packet_handler(HCI_EVENT_PACKET, event, event_size);
                    break;
                case HCI_EVENT_SCO_CAN_SEND_NOW:
                    send_sco_data();
                    break;
                default:
                    break;
            }

            if (event[0] != HCI_EVENT_HFP_META) return;

            if (event[3]
                && event[2] != HFP_SUBEVENT_PLACE_CALL_WITH_NUMBER
                && event[2] != HFP_SUBEVENT_ATTACH_NUMBER_TO_VOICE_TAG
                && event[2] != HFP_SUBEVENT_TRANSMIT_DTMF_CODES){
                printf("ERROR, status: %u\n", event[3]);
                return;
            }

            switch (event[2]) {
                case HFP_SUBEVENT_SERVICE_LEVEL_CONNECTION_ESTABLISHED:
                    handle = hfp_subevent_service_level_connection_established_get_con_handle(event);
                    printf("Service level connection established.\n");
                    break;
                case HFP_SUBEVENT_SERVICE_LEVEL_CONNECTION_RELEASED:
                    printf("Service level connection released.\n");
                    sco_handle = 0;
                    break;
                case HFP_SUBEVENT_AUDIO_CONNECTION_ESTABLISHED:
                    if (hfp_subevent_audio_connection_established_get_status(event)){
                        printf("Audio connection establishment failed with status %u\n", hfp_subevent_audio_connection_established_get_status(event));
                        sco_handle = 0;
                    } else {
                        sco_handle = hfp_subevent_audio_connection_established_get_handle(event);
                        printf("Audio connection established with SCO handle 0x%04x.\n", sco_handle);
                        hci_request_sco_can_send_now_event();
                    }
                    break;
                case HFP_SUBEVENT_AUDIO_CONNECTION_RELEASED:
                    printf("\n** Audio connection released **\n");
                    sco_handle = 0;
                    break;
                case HFP_SUBEVENT_START_RINGINIG:
                    printf("\n** Start Ringing **\n");
                    break;
                case HFP_SUBEVENT_STOP_RINGINIG:
                    printf("\n** Stop Ringing **\n");
                    break;
                case HFP_SUBEVENT_PLACE_CALL_WITH_NUMBER:
                    printf("\n** Outgoing call '%s' **\n", hfp_subevent_place_call_with_number_get_number(event));
                    // validate number
                    if ( strcmp("1234567", hfp_subevent_place_call_with_number_get_number(event)) == 0
                      || strcmp("7654321", hfp_subevent_place_call_with_number_get_number(event)) == 0
                      || (memory_1_enabled && strcmp(">1", hfp_subevent_place_call_with_number_get_number(event)) == 0)){
                        printf("Dialstring valid: accept call\n");
                        hfp_ag_outgoing_call_accepted();
                    } else {
                        printf("Dialstring invalid: reject call\n");
                        hfp_ag_outgoing_call_rejected();
                    }
                    break;

                case HFP_SUBEVENT_ATTACH_NUMBER_TO_VOICE_TAG:
                    printf("\n** Attach number to voice tag. Sending '1234567\n");
                    hfp_ag_send_phone_number_for_voice_tag(device_addr, "1234567");
                    break;
                case HFP_SUBEVENT_TRANSMIT_DTMF_CODES:
                    printf("\n** Send DTMF Codes: '%s'\n", hfp_subevent_transmit_dtmf_codes_get_dtmf(event));
                    hfp_ag_send_dtmf_code_done(device_addr);
                    break;
                case HFP_SUBEVENT_CALL_ANSWERED:
                    printf("Call answered by HF\n");
                    break;
                default:
                    printf("Event not handled %u\n", event[2]);
                    break;
            }
        default:
            break;
    }
}

static hfp_phone_number_t subscriber_number = {
    129, "225577"
};

/* @section Main Application Setup
 *
 * @text Listing MainConfiguration shows main application code.
 * To run a HFP AG service you need to initialize the SDP, and to create and register HFP AG record with it.
 * The packet_handler is used for sending commands to the HFP HF. It also receives the HFP HF's answers.
 * The stdin_process callback allows for sending commands to the HFP HF.
 * At the end the Bluetooth stack is started.
 */

/* LISTING_START(MainConfiguration): Setup HFP Audio Gateway */

int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){

    gap_discoverable_control(1);

    // L2CAP
    l2cap_init();

    // HFP
    rfcomm_init();
    hfp_ag_init(rfcomm_channel_nr);
    hfp_ag_init_supported_features(0x3ef | (1<<HFP_AGSF_HF_INDICATORS) | (1<<HFP_AGSF_ESCO_S4));
    hfp_ag_init_codecs(sizeof(codecs), codecs);
    hfp_ag_init_ag_indicators(ag_indicators_nr, ag_indicators);
    hfp_ag_init_hf_indicators(hf_indicators_nr, hf_indicators);
    hfp_ag_init_call_hold_services(call_hold_services_nr, call_hold_services);
    hfp_ag_set_subcriber_number_information(&subscriber_number, 1);
    hfp_ag_register_packet_handler(&packet_handler);
    hci_register_sco_packet_handler(&packet_handler);

    // SDP Server
    sdp_init();
    memset(hfp_service_buffer, 0, sizeof(hfp_service_buffer));
    hfp_ag_create_sdp_record( hfp_service_buffer, 0x10001, rfcomm_channel_nr, hfp_ag_service_name, 0, 0);
    printf("SDP service record size: %u\n", de_get_len( hfp_service_buffer));
    sdp_register_service(hfp_service_buffer);

#ifdef HAVE_POSIX_STDIN
    btstack_stdin_setup(stdin_process);
#endif
    // turn on!
    hci_power_control(HCI_POWER_ON);
    return 0;
}
/* LISTING_END */
/* EXAMPLE_END */