xref: /btstack/src/classic/hfp_hf.c (revision f4000eeb258b8fdb1871047f8f7b5f73f054a781)

/*
 * 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]
 *
 */

// *****************************************************************************
//
// Minimal setup for HFP Hands-Free (HF) unit (!! UNDER DEVELOPMENT !!)
//
// *****************************************************************************

#include "btstack_config.h"

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

#include "hci_cmd.h"
#include "btstack_run_loop.h"

#include "hci.h"
#include "btstack_memory.h"
#include "hci_dump.h"
#include "l2cap.h"
#include "classic/sdp_query_rfcomm.h"
#include "classic/sdp_server.h"
#include "btstack_debug.h"
#include "classic/hfp.h"
#include "classic/hfp_hf.h"


static const char default_hfp_hf_service_name[] = "Hands-Free unit";
static uint16_t hfp_supported_features = HFP_DEFAULT_HF_SUPPORTED_FEATURES;
static uint8_t hfp_codecs_nr = 0;
static uint8_t hfp_codecs[HFP_MAX_NUM_CODECS];

static uint8_t hfp_indicators_nr = 0;
static uint8_t hfp_indicators[HFP_MAX_NUM_HF_INDICATORS];
static uint32_t hfp_indicators_value[HFP_MAX_NUM_HF_INDICATORS];
static uint16_t hfp_indicators_status;

static uint8_t hfp_hf_speaker_gain = 9;
static uint8_t hfp_hf_microphone_gain = 9;

static hfp_callback_t hfp_callback;

static hfp_call_status_t hfp_call_status;
static hfp_callsetup_status_t hfp_callsetup_status;
static hfp_callheld_status_t hfp_callheld_status;

static char phone_number[25];

static btstack_packet_callback_registration_t hci_event_callback_registration;

void hfp_hf_register_packet_handler(hfp_callback_t callback){
    hfp_callback = callback;
    if (callback == NULL){
        log_error("hfp_hf_register_packet_handler called with NULL callback");
        return;
    }
    hfp_callback = callback;
    hfp_set_callback(callback);
}

static int hfp_hf_supports_codec(uint8_t codec){
    int i;
    for (i = 0; i < hfp_codecs_nr; i++){
        if (hfp_codecs[i] == codec) return 1;
    }
    return HFP_CODEC_CVSD;
}
static int has_codec_negotiation_feature(hfp_connection_t * connection){
    int hf = get_bit(hfp_supported_features, HFP_HFSF_CODEC_NEGOTIATION);
    int ag = get_bit(connection->remote_supported_features, HFP_AGSF_CODEC_NEGOTIATION);
    return hf && ag;
}

static int has_call_waiting_and_3way_calling_feature(hfp_connection_t * connection){
    int hf = get_bit(hfp_supported_features, HFP_HFSF_THREE_WAY_CALLING);
    int ag = get_bit(connection->remote_supported_features, HFP_AGSF_THREE_WAY_CALLING);
    return hf && ag;
}


static int has_hf_indicators_feature(hfp_connection_t * connection){
    int hf = get_bit(hfp_supported_features, HFP_HFSF_HF_INDICATORS);
    int ag = get_bit(connection->remote_supported_features, HFP_AGSF_HF_INDICATORS);
    return hf && ag;
}

static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);

void hfp_hf_create_sdp_record(uint8_t * service, uint32_t service_record_handle, int rfcomm_channel_nr, const char * name, uint16_t supported_features){
    if (!name){
        name = default_hfp_hf_service_name;
    }
    hfp_create_sdp_record(service, service_record_handle, SDP_Handsfree, rfcomm_channel_nr, name);

    de_add_number(service, DE_UINT, DE_SIZE_16, 0x0311);    // Hands-Free Profile - SupportedFeatures
    de_add_number(service, DE_UINT, DE_SIZE_16, supported_features);
}

static int hfp_hf_cmd_exchange_supported_features(uint16_t cid){
    char buffer[20];
    sprintf(buffer, "AT%s=%d\r\n", HFP_SUPPORTED_FEATURES, hfp_supported_features);
    // printf("exchange_supported_features %s\n", buffer);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_notify_on_codecs(uint16_t cid){
    char buffer[30];
    int offset = snprintf(buffer, sizeof(buffer), "AT%s=", HFP_AVAILABLE_CODECS);
    offset += join(buffer+offset, sizeof(buffer)-offset, hfp_codecs, hfp_codecs_nr);
    offset += snprintf(buffer+offset, sizeof(buffer)-offset, "\r\n");
    buffer[offset] = 0;
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_retrieve_indicators(uint16_t cid){
    char buffer[20];
    sprintf(buffer, "AT%s=?\r\n", HFP_INDICATOR);
    // printf("retrieve_indicators %s\n", buffer);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_retrieve_indicators_status(uint16_t cid){
    char buffer[20];
    sprintf(buffer, "AT%s?\r\n", HFP_INDICATOR);
    // printf("retrieve_indicators_status %s\n", buffer);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_activate_status_update_for_all_ag_indicators(uint16_t cid, uint8_t activate){
    char buffer[20];
    sprintf(buffer, "AT%s=3,0,0,%d\r\n", HFP_ENABLE_STATUS_UPDATE_FOR_AG_INDICATORS, activate);
    // printf("toggle_indicator_status_update %s\n", buffer);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_activate_status_update_for_ag_indicator(uint16_t cid, uint32_t indicators_status, int indicators_nr){
    char buffer[50];
    int offset = snprintf(buffer, sizeof(buffer), "AT%s=", HFP_UPDATE_ENABLE_STATUS_FOR_INDIVIDUAL_AG_INDICATORS);
    offset += join_bitmap(buffer+offset, sizeof(buffer)-offset, indicators_status, indicators_nr);
    offset += snprintf(buffer+offset, sizeof(buffer)-offset, "\r\n");
    buffer[offset] = 0;
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_retrieve_can_hold_call(uint16_t cid){
    char buffer[20];
    sprintf(buffer, "AT%s=?\r\n", HFP_SUPPORT_CALL_HOLD_AND_MULTIPARTY_SERVICES);
    // printf("retrieve_can_hold_call %s\n", buffer);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_list_supported_generic_status_indicators(uint16_t cid){
    char buffer[30];
    int offset = snprintf(buffer, sizeof(buffer), "AT%s=", HFP_GENERIC_STATUS_INDICATOR);
    offset += join(buffer+offset, sizeof(buffer)-offset, hfp_indicators, hfp_indicators_nr);
    offset += snprintf(buffer+offset, sizeof(buffer)-offset, "\r\n");
    buffer[offset] = 0;
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_retrieve_supported_generic_status_indicators(uint16_t cid){
    char buffer[20];
    sprintf(buffer, "AT%s=?\r\n", HFP_GENERIC_STATUS_INDICATOR);
    // printf("retrieve_supported_generic_status_indicators %s\n", buffer);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_list_initital_supported_generic_status_indicators(uint16_t cid){
    char buffer[20];
    sprintf(buffer, "AT%s?\r\n", HFP_GENERIC_STATUS_INDICATOR);
    // printf("list_initital_supported_generic_status_indicators %s\n", buffer);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_query_operator_name_format(uint16_t cid){
    char buffer[20];
    sprintf(buffer, "AT%s=3,0\r\n", HFP_QUERY_OPERATOR_SELECTION);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_query_operator_name(uint16_t cid){
    char buffer[20];
    sprintf(buffer, "AT%s?\r\n", HFP_QUERY_OPERATOR_SELECTION);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_enable_extended_audio_gateway_error_report(uint16_t cid, uint8_t enable){
    char buffer[20];
    sprintf(buffer, "AT%s=%d\r\n", HFP_ENABLE_EXTENDED_AUDIO_GATEWAY_ERROR, enable);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_trigger_codec_connection_setup(uint16_t cid){
    char buffer[20];
    sprintf(buffer, "AT%s\r\n", HFP_TRIGGER_CODEC_CONNECTION_SETUP);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_confirm_codec(uint16_t cid, uint8_t codec){
    char buffer[20];
    sprintf(buffer, "AT%s=%d\r\n", HFP_CONFIRM_COMMON_CODEC, codec);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_cmd_ata(uint16_t cid){
    char buffer[10];
    sprintf(buffer, "%s\r\n", HFP_CALL_ANSWERED);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_set_microphone_gain_cmd(uint16_t cid, int gain){
    char buffer[40];
    sprintf(buffer, "AT%s=%d\r\n", HFP_SET_MICROPHONE_GAIN, gain);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_set_speaker_gain_cmd(uint16_t cid, int gain){
    char buffer[40];
    sprintf(buffer, "AT%s=%d\r\n", HFP_SET_SPEAKER_GAIN, gain);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_set_calling_line_notification_cmd(uint16_t cid, uint8_t activate){
    char buffer[40];
    sprintf(buffer, "AT%s=%d\r\n", HFP_ENABLE_CLIP, activate);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_set_echo_canceling_and_noise_reduction_cmd(uint16_t cid, uint8_t activate){
    char buffer[40];
    sprintf(buffer, "AT%s=%d\r\n", HFP_TURN_OFF_EC_AND_NR, activate);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_set_voice_recognition_notification_cmd(uint16_t cid, uint8_t activate){
    char buffer[40];
    sprintf(buffer, "AT%s=%d\r\n", HFP_ACTIVATE_VOICE_RECOGNITION, activate);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_set_call_waiting_notification_cmd(uint16_t cid, uint8_t activate){
    char buffer[40];
    sprintf(buffer, "AT%s=%d\r\n", HFP_ENABLE_CALL_WAITING_NOTIFICATION, activate);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_initiate_outgoing_call_cmd(uint16_t cid){
    char buffer[40];
    sprintf(buffer, "%s%s;\r\n", HFP_CALL_PHONE_NUMBER, phone_number);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_send_memory_dial_cmd(uint16_t cid){
    char buffer[40];
    sprintf(buffer, "%s>%s;\r\n", HFP_CALL_PHONE_NUMBER, phone_number);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_send_redial_last_number_cmd(uint16_t cid){
    char buffer[20];
    sprintf(buffer, "AT%s\r\n", HFP_REDIAL_LAST_NUMBER);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_send_chup(uint16_t cid){
    char buffer[20];
    sprintf(buffer, "AT%s\r\n", HFP_HANG_UP_CALL);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_send_chld(uint16_t cid, int number){
    char buffer[20];
    sprintf(buffer, "AT%s=%u\r\n", HFP_SUPPORT_CALL_HOLD_AND_MULTIPARTY_SERVICES, number);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_send_dtmf(uint16_t cid, char code){
    char buffer[20];
    sprintf(buffer, "AT%s=%c\r\n", HFP_TRANSMIT_DTMF_CODES, code);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_send_binp(uint16_t cid){
    char buffer[20];
    sprintf(buffer, "AT%s=1\r\n", HFP_PHONE_NUMBER_FOR_VOICE_TAG);
    return send_str_over_rfcomm(cid, buffer);
}

static int hfp_hf_send_clcc(uint16_t cid){
    char buffer[20];
    sprintf(buffer, "AT%s\r\n", HFP_LIST_CURRENT_CALLS);
    return send_str_over_rfcomm(cid, buffer);
}

static void hfp_emit_ag_indicator_event(hfp_callback_t callback, int status, hfp_ag_indicator_t indicator){
    if (!callback) return;
    uint8_t event[6+HFP_MAX_INDICATOR_DESC_SIZE+1];
    event[0] = HCI_EVENT_HFP_META;
    event[1] = sizeof(event) - 2;
    event[2] = HFP_SUBEVENT_AG_INDICATOR_STATUS_CHANGED;
    event[3] = status;
    event[4] = indicator.index;
    event[5] = indicator.status;
    strncpy((char*)&event[6], indicator.name, HFP_MAX_INDICATOR_DESC_SIZE);
    event[6+HFP_MAX_INDICATOR_DESC_SIZE] = 0;
    (*callback)(event, sizeof(event));
}

static void hfp_emit_network_operator_event(hfp_callback_t callback, int status, hfp_network_opearator_t network_operator){
    if (!callback) return;
    uint8_t event[24];
    event[0] = HCI_EVENT_HFP_META;
    event[1] = sizeof(event) - 2;
    event[2] = HFP_SUBEVENT_NETWORK_OPERATOR_CHANGED;
    event[3] = status;
    event[4] = network_operator.mode;
    event[5] = network_operator.format;
    strcpy((char*)&event[6], network_operator.name);
    (*callback)(event, sizeof(event));
}

static int hfp_hf_run_for_context_service_level_connection(hfp_connection_t * context){
    if (context->state >= HFP_SERVICE_LEVEL_CONNECTION_ESTABLISHED) return 0;
    if (context->ok_pending) return 0;
    int done = 1;

    switch (context->state){
        case HFP_EXCHANGE_SUPPORTED_FEATURES:
            context->state = HFP_W4_EXCHANGE_SUPPORTED_FEATURES;
            hfp_hf_cmd_exchange_supported_features(context->rfcomm_cid);
            break;
        case HFP_NOTIFY_ON_CODECS:
            context->state = HFP_W4_NOTIFY_ON_CODECS;
            hfp_hf_cmd_notify_on_codecs(context->rfcomm_cid);
            break;
        case HFP_RETRIEVE_INDICATORS:
            context->state = HFP_W4_RETRIEVE_INDICATORS;
            hfp_hf_cmd_retrieve_indicators(context->rfcomm_cid);
            break;
        case HFP_RETRIEVE_INDICATORS_STATUS:
            context->state = HFP_W4_RETRIEVE_INDICATORS_STATUS;
            hfp_hf_cmd_retrieve_indicators_status(context->rfcomm_cid);
            break;
        case HFP_ENABLE_INDICATORS_STATUS_UPDATE:
            context->state = HFP_W4_ENABLE_INDICATORS_STATUS_UPDATE;
            hfp_hf_cmd_activate_status_update_for_all_ag_indicators(context->rfcomm_cid, 1);
            break;
        case HFP_RETRIEVE_CAN_HOLD_CALL:
            context->state = HFP_W4_RETRIEVE_CAN_HOLD_CALL;
            hfp_hf_cmd_retrieve_can_hold_call(context->rfcomm_cid);
            break;
        case HFP_LIST_GENERIC_STATUS_INDICATORS:
            context->state = HFP_W4_LIST_GENERIC_STATUS_INDICATORS;
            hfp_hf_cmd_list_supported_generic_status_indicators(context->rfcomm_cid);
            break;
        case HFP_RETRIEVE_GENERIC_STATUS_INDICATORS:
            context->state = HFP_W4_RETRIEVE_GENERIC_STATUS_INDICATORS;
            hfp_hf_cmd_retrieve_supported_generic_status_indicators(context->rfcomm_cid);
            break;
        case HFP_RETRIEVE_INITITAL_STATE_GENERIC_STATUS_INDICATORS:
            context->state = HFP_W4_RETRIEVE_INITITAL_STATE_GENERIC_STATUS_INDICATORS;
            hfp_hf_cmd_list_initital_supported_generic_status_indicators(context->rfcomm_cid);
            break;
        default:
            done = 0;
            break;
    }
    return done;
}


static int hfp_hf_run_for_context_service_level_connection_queries(hfp_connection_t * context){
    if (context->state != HFP_SERVICE_LEVEL_CONNECTION_ESTABLISHED) return 0;
    if (context->ok_pending) return 0;

    int done = 0;
    if (context->enable_status_update_for_ag_indicators != 0xFF){
        context->ok_pending = 1;
        done = 1;
        hfp_hf_cmd_activate_status_update_for_all_ag_indicators(context->rfcomm_cid, context->enable_status_update_for_ag_indicators);
        return done;
    };
    if (context->change_status_update_for_individual_ag_indicators){
        context->ok_pending = 1;
        done = 1;
        hfp_hf_cmd_activate_status_update_for_ag_indicator(context->rfcomm_cid,
                context->ag_indicators_status_update_bitmap,
                context->ag_indicators_nr);
        return done;
    }

    switch (context->hf_query_operator_state){
        case HFP_HF_QUERY_OPERATOR_SET_FORMAT:
            context->hf_query_operator_state = HFP_HF_QUERY_OPERATOR_W4_SET_FORMAT_OK;
            context->ok_pending = 1;
            hfp_hf_cmd_query_operator_name_format(context->rfcomm_cid);
            return 1;
        case HFP_HF_QUERY_OPERATOR_SEND_QUERY:
            context->hf_query_operator_state = HPF_HF_QUERY_OPERATOR_W4_RESULT;
            context->ok_pending = 1;
            hfp_hf_cmd_query_operator_name(context->rfcomm_cid);
            return 1;
        default:
            break;
    }

    if (context->enable_extended_audio_gateway_error_report){
        context->ok_pending = 1;
        done = 1;
        hfp_hf_cmd_enable_extended_audio_gateway_error_report(context->rfcomm_cid, context->enable_extended_audio_gateway_error_report);
        return done;
    }

    return done;
}

static int codecs_exchange_state_machine(hfp_connection_t * context){
    /* events ( == commands):
        HFP_CMD_AVAILABLE_CODECS == received AT+BAC with list of codecs
        HFP_CMD_TRIGGER_CODEC_CONNECTION_SETUP:
            hf_trigger_codec_connection_setup == received BCC
            ag_trigger_codec_connection_setup == received from AG to send BCS
        HFP_CMD_HF_CONFIRMED_CODEC == received AT+BCS
    */

    if (context->ok_pending) return 0;

    switch (context->command){
        case HFP_CMD_AVAILABLE_CODECS:
            if (context->codecs_state == HFP_CODECS_W4_AG_COMMON_CODEC) return 0;

            context->codecs_state = HFP_CODECS_W4_AG_COMMON_CODEC;
            context->ok_pending = 1;
            hfp_hf_cmd_notify_on_codecs(context->rfcomm_cid);
            return 1;
        case HFP_CMD_TRIGGER_CODEC_CONNECTION_SETUP:
            context->codec_confirmed = 0;
            context->suggested_codec = 0;
            context->negotiated_codec = 0;

            context->codecs_state = HFP_CODECS_RECEIVED_TRIGGER_CODEC_EXCHANGE;
            context->ok_pending = 1;
            hfp_hf_cmd_trigger_codec_connection_setup(context->rfcomm_cid);
            break;

         case HFP_CMD_AG_SUGGESTED_CODEC:
            if (hfp_hf_supports_codec(context->suggested_codec)){
                context->codec_confirmed = context->suggested_codec;
                context->ok_pending = 1;
                context->codecs_state = HFP_CODECS_HF_CONFIRMED_CODEC;
                hfp_hf_cmd_confirm_codec(context->rfcomm_cid, context->suggested_codec);
            } else {
                context->codec_confirmed = 0;
                context->suggested_codec = 0;
                context->negotiated_codec = 0;
                context->codecs_state = HFP_CODECS_W4_AG_COMMON_CODEC;
                context->ok_pending = 1;
                hfp_hf_cmd_notify_on_codecs(context->rfcomm_cid);

            }
            break;

        default:
            break;
    }
    return 0;
}

static int hfp_hf_run_for_audio_connection(hfp_connection_t * context){
    if (context->state < HFP_SERVICE_LEVEL_CONNECTION_ESTABLISHED ||
        context->state > HFP_W2_DISCONNECT_SCO) return 0;


    if (context->state == HFP_AUDIO_CONNECTION_ESTABLISHED && context->release_audio_connection){
        context->state = HFP_W4_SCO_DISCONNECTED;
        context->release_audio_connection = 0;
        gap_disconnect(context->sco_handle);
        return 1;
    }

    if (context->state == HFP_AUDIO_CONNECTION_ESTABLISHED) return 0;

    // run codecs exchange
    int done = codecs_exchange_state_machine(context);
    if (done) return 1;

    if (context->establish_audio_connection){
        context->state = HFP_W4_SCO_CONNECTED;
        context->establish_audio_connection = 0;
        hfp_setup_synchronous_connection(context->con_handle, context->link_setting);
        return 1;
    }

    return 0;
}

static int call_setup_state_machine(hfp_connection_t * context){
    if (context->hf_answer_incoming_call){
        hfp_hf_cmd_ata(context->rfcomm_cid);
        context->hf_answer_incoming_call = 0;
        return 1;
    }
    return 0;
}

static void hfp_run_for_context(hfp_connection_t * context){
    if (!context) return;
    if (!rfcomm_can_send_packet_now(context->rfcomm_cid)) return;

    int done = hfp_hf_run_for_context_service_level_connection(context);
    if (!done){
        done = hfp_hf_run_for_context_service_level_connection_queries(context);
    }
    if (!done){
        done = hfp_hf_run_for_audio_connection(context);
    }
    if (!done){
        done = call_setup_state_machine(context);
    }

    if (context->send_microphone_gain){
        context->send_microphone_gain = 0;
        context->ok_pending = 1;
        hfp_hf_set_microphone_gain_cmd(context->rfcomm_cid, context->microphone_gain);
        return;
    }

    if (context->send_speaker_gain){
        context->send_speaker_gain = 0;
        context->ok_pending = 1;
        hfp_hf_set_speaker_gain_cmd(context->rfcomm_cid, context->speaker_gain);
        return;
    }

    if (context->hf_deactivate_calling_line_notification){
        context->hf_deactivate_calling_line_notification = 0;
        context->ok_pending = 1;
        hfp_hf_set_calling_line_notification_cmd(context->rfcomm_cid, 0);
        return;
    }

    if (context->hf_activate_calling_line_notification){
        context->hf_activate_calling_line_notification = 0;
        context->ok_pending = 1;
        hfp_hf_set_calling_line_notification_cmd(context->rfcomm_cid, 1);
        return;
    }

    if (context->hf_deactivate_echo_canceling_and_noise_reduction){
        context->hf_deactivate_echo_canceling_and_noise_reduction = 0;
        context->ok_pending = 1;
        hfp_hf_set_echo_canceling_and_noise_reduction_cmd(context->rfcomm_cid, 0);
        return;
    }

    if (context->hf_activate_echo_canceling_and_noise_reduction){
        context->hf_activate_echo_canceling_and_noise_reduction = 0;
        context->ok_pending = 1;
        hfp_hf_set_echo_canceling_and_noise_reduction_cmd(context->rfcomm_cid, 1);
        return;
    }

    if (context->hf_deactivate_voice_recognition_notification){
        context->hf_deactivate_voice_recognition_notification = 0;
        context->ok_pending = 1;
        hfp_hf_set_voice_recognition_notification_cmd(context->rfcomm_cid, 0);
        return;
    }

    if (context->hf_activate_voice_recognition_notification){
        context->hf_activate_voice_recognition_notification = 0;
        context->ok_pending = 1;
        hfp_hf_set_voice_recognition_notification_cmd(context->rfcomm_cid, 1);
        return;
    }


    if (context->hf_deactivate_call_waiting_notification){
        context->hf_deactivate_call_waiting_notification = 0;
        context->ok_pending = 1;
        hfp_hf_set_call_waiting_notification_cmd(context->rfcomm_cid, 0);
        return;
    }

    if (context->hf_activate_call_waiting_notification){
        context->hf_activate_call_waiting_notification = 0;
        context->ok_pending = 1;
        hfp_hf_set_call_waiting_notification_cmd(context->rfcomm_cid, 1);
        return;
    }

    if (context->hf_initiate_outgoing_call){
        context->hf_initiate_outgoing_call = 0;
        context->ok_pending = 1;
        hfp_hf_initiate_outgoing_call_cmd(context->rfcomm_cid);
        return;
    }

    if (context->hf_initiate_memory_dialing){
        context->hf_initiate_memory_dialing = 0;
        context->ok_pending = 1;
        hfp_hf_send_memory_dial_cmd(context->rfcomm_cid);
        return;
    }

    if (context->hf_initiate_redial_last_number){
        context->hf_initiate_redial_last_number = 0;
        context->ok_pending = 1;
        hfp_hf_send_redial_last_number_cmd(context->rfcomm_cid);
        return;
    }

    if (context->hf_send_chup){
        context->hf_send_chup = 0;
        context->ok_pending = 1;
        hfp_hf_send_chup(context->rfcomm_cid);
        return;
    }

    if (context->hf_send_chld_0){
        context->hf_send_chld_0 = 0;
        context->ok_pending = 1;
        hfp_hf_send_chld(context->rfcomm_cid, 0);
        return;
    }

    if (context->hf_send_chld_1){
        context->hf_send_chld_1 = 0;
        context->ok_pending = 1;
        hfp_hf_send_chld(context->rfcomm_cid, 1);
        return;
    }

    if (context->hf_send_chld_2){
        context->hf_send_chld_2 = 0;
        context->ok_pending = 1;
        hfp_hf_send_chld(context->rfcomm_cid, 2);
        return;
    }

    if (context->hf_send_chld_3){
        context->hf_send_chld_3 = 0;
        context->ok_pending = 1;
        hfp_hf_send_chld(context->rfcomm_cid, 3);
        return;
    }

    if (context->hf_send_chld_4){
        context->hf_send_chld_4 = 0;
        context->ok_pending = 1;
        hfp_hf_send_chld(context->rfcomm_cid, 4);
        return;
    }

    if (context->hf_send_chld_x){
        context->hf_send_chld_x = 0;
        context->ok_pending = 1;
        hfp_hf_send_chld(context->rfcomm_cid, context->hf_send_chld_x_index);
        return;
    }

    if (context->hf_send_dtmf_code){
        char code = context->hf_send_dtmf_code;
        context->hf_send_dtmf_code = 0;
        context->ok_pending = 1;
        hfp_hf_send_dtmf(context->rfcomm_cid, code);
        return;
    }

    if (context->hf_send_binp){
        context->hf_send_binp = 0;
        context->ok_pending = 1;
        hfp_hf_send_binp(context->rfcomm_cid);
        return;
    }

    if (context->hf_send_clcc){
        context->hf_send_clcc = 0;
        context->ok_pending = 1;
        hfp_hf_send_clcc(context->rfcomm_cid);
        return;
    }

    if (context->hf_send_rrh){
        context->hf_send_rrh = 0;
        char buffer[20];
        switch (context->hf_send_rrh_command){
            case '?':
                sprintf(buffer, "AT%s?\r\n", HFP_RESPONSE_AND_HOLD);
                send_str_over_rfcomm(context->rfcomm_cid, buffer);
                return;
            case '0':
            case '1':
            case '2':
                sprintf(buffer, "AT%s=%c\r\n", HFP_RESPONSE_AND_HOLD, context->hf_send_rrh_command);
                send_str_over_rfcomm(context->rfcomm_cid, buffer);
                return;
            default:
                break;
        }
        return;
    }

    if (context->hf_send_cnum){
        context->hf_send_cnum = 0;
        char buffer[20];
        sprintf(buffer, "AT%s\r\n", HFP_SUBSCRIBER_NUMBER_INFORMATION);
        send_str_over_rfcomm(context->rfcomm_cid, buffer);
        return;
    }

    // update HF indicators
    if (context->generic_status_update_bitmap){
        int i;
        for (i=0;i<hfp_indicators_nr;i++){
            if (get_bit(context->generic_status_update_bitmap, i)){
                if (context->generic_status_indicators[i].state){
                    context->ok_pending = 1;
                    context->generic_status_update_bitmap = store_bit(context->generic_status_update_bitmap, i, 0);
                    char buffer[30];
                    sprintf(buffer, "AT%s=%u,%u\r\n", HFP_TRANSFER_HF_INDICATOR_STATUS, hfp_indicators[i], hfp_indicators_value[i]);
                    send_str_over_rfcomm(context->rfcomm_cid, buffer);
                } else {
                    printf("Not sending HF indicator %u as it is disabled\n", hfp_indicators[i]);
                }
                return;
            }
        }
    }

    if (done) return;
    // deal with disconnect
    switch (context->state){
        case HFP_W2_DISCONNECT_RFCOMM:
            context->state = HFP_W4_RFCOMM_DISCONNECTED;
            rfcomm_disconnect(context->rfcomm_cid);
            break;

        default:
            break;
    }
}

static void hfp_init_link_settings(hfp_connection_t * context){
    // determine highest possible link setting
    context->link_setting = HFP_LINK_SETTINGS_D1;
    if (hci_remote_esco_supported(context->con_handle)){
        context->link_setting = HFP_LINK_SETTINGS_S3;
        if ((hfp_supported_features             & (1<<HFP_HFSF_ESCO_S4))
        &&  (context->remote_supported_features & (1<<HFP_AGSF_ESCO_S4))){
            context->link_setting = HFP_LINK_SETTINGS_S4;
        }
    }
}

static void hfp_ag_slc_established(hfp_connection_t * context){
    context->state = HFP_SERVICE_LEVEL_CONNECTION_ESTABLISHED;
    hfp_emit_event(hfp_callback, HFP_SUBEVENT_SERVICE_LEVEL_CONNECTION_ESTABLISHED, 0);
    hfp_init_link_settings(context);
    // restore volume settings
    context->speaker_gain = hfp_hf_speaker_gain;
    context->send_speaker_gain = 1;
    hfp_emit_event(hfp_callback, HFP_SUBEVENT_SPEAKER_VOLUME, hfp_hf_speaker_gain);
    context->microphone_gain = hfp_hf_microphone_gain;
    context->send_microphone_gain = 1;
    hfp_emit_event(hfp_callback, HFP_SUBEVENT_MICROPHONE_VOLUME, hfp_hf_microphone_gain);
    // enable all indicators
    int i;
    for (i=0;i<hfp_indicators_nr;i++){
        context->generic_status_indicators[i].uuid = hfp_indicators[i];
        context->generic_status_indicators[i].state = 1;
    }
}

static void hfp_hf_switch_on_ok(hfp_connection_t *context){
    context->ok_pending = 0;
    int done = 1;
    switch (context->state){
        case HFP_W4_EXCHANGE_SUPPORTED_FEATURES:
            if (has_codec_negotiation_feature(context)){
                context->state = HFP_NOTIFY_ON_CODECS;
                break;
            }
            context->state = HFP_RETRIEVE_INDICATORS;
            break;

        case HFP_W4_NOTIFY_ON_CODECS:
            context->state = HFP_RETRIEVE_INDICATORS;
            break;

        case HFP_W4_RETRIEVE_INDICATORS:
            context->state = HFP_RETRIEVE_INDICATORS_STATUS;
            break;

        case HFP_W4_RETRIEVE_INDICATORS_STATUS:
            context->state = HFP_ENABLE_INDICATORS_STATUS_UPDATE;
            break;

        case HFP_W4_ENABLE_INDICATORS_STATUS_UPDATE:
            if (has_call_waiting_and_3way_calling_feature(context)){
                context->state = HFP_RETRIEVE_CAN_HOLD_CALL;
                break;
            }
            if (has_hf_indicators_feature(context)){
                context->state = HFP_LIST_GENERIC_STATUS_INDICATORS;
                break;
            }
            hfp_ag_slc_established(context);
            break;

        case HFP_W4_RETRIEVE_CAN_HOLD_CALL:
            if (has_hf_indicators_feature(context)){
                context->state = HFP_LIST_GENERIC_STATUS_INDICATORS;
                break;
            }
            hfp_ag_slc_established(context);
            break;

        case HFP_W4_LIST_GENERIC_STATUS_INDICATORS:
            context->state = HFP_RETRIEVE_GENERIC_STATUS_INDICATORS;
            break;

        case HFP_W4_RETRIEVE_GENERIC_STATUS_INDICATORS:
            context->state = HFP_RETRIEVE_INITITAL_STATE_GENERIC_STATUS_INDICATORS;
            break;

        case HFP_W4_RETRIEVE_INITITAL_STATE_GENERIC_STATUS_INDICATORS:
            hfp_ag_slc_established(context);
            break;
        case HFP_SERVICE_LEVEL_CONNECTION_ESTABLISHED:
            if (context->enable_status_update_for_ag_indicators != 0xFF){
                context->enable_status_update_for_ag_indicators = 0xFF;
                hfp_emit_event(hfp_callback, HFP_SUBEVENT_COMPLETE, 0);
                break;
            }

            if (context->change_status_update_for_individual_ag_indicators == 1){
                context->change_status_update_for_individual_ag_indicators = 0;
                hfp_emit_event(hfp_callback, HFP_SUBEVENT_COMPLETE, 0);
                break;
            }

            switch (context->hf_query_operator_state){
                case HFP_HF_QUERY_OPERATOR_W4_SET_FORMAT_OK:
                    printf("Format set, querying name\n");
                    context->hf_query_operator_state = HFP_HF_QUERY_OPERATOR_SEND_QUERY;
                    break;
                case HPF_HF_QUERY_OPERATOR_W4_RESULT:
                    context->hf_query_operator_state = HFP_HF_QUERY_OPERATOR_FORMAT_SET;
                    hfp_emit_network_operator_event(hfp_callback, 0, context->network_operator);
                    break;
                default:
                    break;
            }

            if (context->enable_extended_audio_gateway_error_report){
                context->enable_extended_audio_gateway_error_report = 0;
                break;
            }

            switch (context->codecs_state){
                case HFP_CODECS_RECEIVED_TRIGGER_CODEC_EXCHANGE:
                    context->codecs_state = HFP_CODECS_W4_AG_COMMON_CODEC;
                    break;
                case HFP_CODECS_HF_CONFIRMED_CODEC:
                    context->codecs_state = HFP_CODECS_EXCHANGED;
                    hfp_emit_event(hfp_callback, HFP_SUBEVENT_CODECS_CONNECTION_COMPLETE, 0);
                    break;
                default:
                    done = 0;
                    break;
            }
            break;
        default:
            done = 0;
            break;
    }

    // done
    context->command = HFP_CMD_NONE;
}


static void hfp_handle_rfcomm_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
    hfp_connection_t * context = get_hfp_connection_context_for_rfcomm_cid(channel);
    if (!context) return;

    char last_char = packet[size-1];
    packet[size-1] = 0;
    log_info("HFP_RX %s", packet);
    packet[size-1] = last_char;

    int pos, i, value;
    for (pos = 0; pos < size ; pos++){
        hfp_parse(context, packet[pos], 1);
    }

    switch (context->command){
        case HFP_CMD_GET_SUBSCRIBER_NUMBER_INFORMATION:
            context->command = HFP_CMD_NONE;
            printf("Subscriber Number: number %s, type %u\n", context->bnip_number, context->bnip_type);
            break;
        case HFP_CMD_RESPONSE_AND_HOLD_STATUS:
            context->command = HFP_CMD_NONE;
            printf("Response and Hold status: %s\n", context->line_buffer);
            break;
        case HFP_CMD_LIST_CURRENT_CALLS:
            context->command = HFP_CMD_NONE;
            printf("Enhanced Call Status: idx %u, dir %u, status %u, mpty %u, number %s, type %u\n",
                context->clcc_idx, context->clcc_dir, context->clcc_status, context->clcc_mpty,
                context->bnip_number, context->bnip_type);
            break;
        case HFP_CMD_SET_SPEAKER_GAIN:
            context->command = HFP_CMD_NONE;
            value = atoi((char*)context->line_buffer);
            hfp_hf_speaker_gain = value;
            hfp_emit_event(hfp_callback, HFP_SUBEVENT_SPEAKER_VOLUME, value);
            break;
        case HFP_CMD_SET_MICROPHONE_GAIN:
            context->command = HFP_CMD_NONE;
            value = atoi((char*)context->line_buffer);
            hfp_hf_microphone_gain = value;
            hfp_emit_event(hfp_callback, HFP_SUBEVENT_MICROPHONE_VOLUME, value);
            break;
        case HFP_CMD_AG_SENT_PHONE_NUMBER:
            context->command = HFP_CMD_NONE;
            hfp_emit_string_event(hfp_callback, HFP_SUBEVENT_NUMBER_FOR_VOICE_TAG, context->bnip_number);
            break;
        case HFP_CMD_EXTENDED_AUDIO_GATEWAY_ERROR:
            context->ok_pending = 0;
            context->extended_audio_gateway_error = 0;
            context->command = HFP_CMD_NONE;
            hfp_emit_event(hfp_callback, HFP_SUBEVENT_EXTENDED_AUDIO_GATEWAY_ERROR, context->extended_audio_gateway_error);
            break;
        case HFP_CMD_ERROR:
            context->ok_pending = 0;
            hfp_reset_context_flags(context);
            context->command = HFP_CMD_NONE;
            hfp_emit_event(hfp_callback, HFP_SUBEVENT_COMPLETE, 1);
            break;
        case HFP_CMD_OK:
            hfp_hf_switch_on_ok(context);
            break;
        case HFP_CMD_RING:
            hfp_emit_event(hfp_callback, HFP_SUBEVENT_RING, 0);
            break;
        case HFP_CMD_TRANSFER_AG_INDICATOR_STATUS:
            for (i = 0; i < context->ag_indicators_nr; i++){
                if (context->ag_indicators[i].status_changed) {
                    if (strcmp(context->ag_indicators[i].name, "callsetup") == 0){
                        hfp_callsetup_status = (hfp_callsetup_status_t) context->ag_indicators[i].status;
                    } else if (strcmp(context->ag_indicators[i].name, "callheld") == 0){
                        hfp_callheld_status = (hfp_callheld_status_t) context->ag_indicators[i].status;
                    } else if (strcmp(context->ag_indicators[i].name, "call") == 0){
                        hfp_call_status = (hfp_call_status_t) context->ag_indicators[i].status;
                    }
                    context->ag_indicators[i].status_changed = 0;
                    hfp_emit_ag_indicator_event(hfp_callback, 0, context->ag_indicators[i]);
                    break;
                }
            }
            break;
        default:
            break;
    }
    hfp_run_for_context(context);
}

static void hfp_run(){
    btstack_linked_list_iterator_t it;
    btstack_linked_list_iterator_init(&it, hfp_get_connections());
    while (btstack_linked_list_iterator_has_next(&it)){
        hfp_connection_t * connection = (hfp_connection_t *)btstack_linked_list_iterator_next(&it);
        hfp_run_for_context(connection);
    }
}

static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
    switch (packet_type){
        case RFCOMM_DATA_PACKET:
            hfp_handle_rfcomm_event(packet_type, channel, packet, size);
            break;
        case HCI_EVENT_PACKET:
            hfp_handle_hci_event(packet_type, packet, size);
        default:
            break;
    }
    hfp_run();
}

void hfp_hf_set_codecs(uint8_t * codecs, int codecs_nr){
    if (codecs_nr > HFP_MAX_NUM_CODECS){
        log_error("hfp_hf_set_codecs: codecs_nr (%d) > HFP_MAX_NUM_CODECS (%d)", codecs_nr, HFP_MAX_NUM_CODECS);
        return;
    }

    hfp_codecs_nr = codecs_nr;
    int i;
    for (i=0; i<codecs_nr; i++){
        hfp_codecs[i] = codecs[i];
    }

    char buffer[30];
    int offset = join(buffer, sizeof(buffer), hfp_codecs, hfp_codecs_nr);
    buffer[offset] = 0;
    btstack_linked_list_iterator_t it;
    btstack_linked_list_iterator_init(&it, hfp_get_connections());
    while (btstack_linked_list_iterator_has_next(&it)){
        hfp_connection_t * connection = (hfp_connection_t *)btstack_linked_list_iterator_next(&it);
        if (!connection) continue;
        connection->command = HFP_CMD_AVAILABLE_CODECS;
        hfp_run_for_context(connection);
    }
}

void hfp_hf_init(uint16_t rfcomm_channel_nr, uint32_t supported_features, uint16_t * indicators, int indicators_nr, uint32_t indicators_status){

    // register for HCI events
    hci_event_callback_registration.callback = &packet_handler;
    hci_add_event_handler(&hci_event_callback_registration);

    l2cap_init();
    rfcomm_register_service(packet_handler, rfcomm_channel_nr, 0xffff);
    hfp_init();

    hfp_supported_features = supported_features;

    hfp_indicators_nr = indicators_nr;
    hfp_indicators_status = indicators_status;
    int i;
    for (i=0; i<indicators_nr; i++){
        hfp_indicators[i] = indicators[i];
    }
}

void hfp_hf_set_supported_features(uint32_t supported_features){
    hfp_supported_features = supported_features;
}

void hfp_hf_establish_service_level_connection(bd_addr_t bd_addr){
    hfp_establish_service_level_connection(bd_addr, SDP_HandsfreeAudioGateway);
}

void hfp_hf_release_service_level_connection(bd_addr_t bd_addr){
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);
    hfp_release_service_level_connection(connection);
    hfp_run_for_context(connection);
}

static void hfp_hf_set_status_update_for_all_ag_indicators(bd_addr_t bd_addr, uint8_t enable){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);
    if (!connection){
        log_error("HFP HF: connection doesn't exist.");
        return;
    }
    connection->enable_status_update_for_ag_indicators = enable;
    hfp_run_for_context(connection);
}

void hfp_hf_enable_status_update_for_all_ag_indicators(bd_addr_t bd_addr){
    hfp_hf_set_status_update_for_all_ag_indicators(bd_addr, 1);
}

void hfp_hf_disable_status_update_for_all_ag_indicators(bd_addr_t bd_addr){
    hfp_hf_set_status_update_for_all_ag_indicators(bd_addr, 0);
}

// TODO: returned ERROR - wrong format
void hfp_hf_set_status_update_for_individual_ag_indicators(bd_addr_t bd_addr, uint32_t indicators_status_bitmap){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);
    if (!connection){
        log_error("HFP HF: connection doesn't exist.");
        return;
    }
    connection->change_status_update_for_individual_ag_indicators = 1;
    connection->ag_indicators_status_update_bitmap = indicators_status_bitmap;
    hfp_run_for_context(connection);
}

void hfp_hf_query_operator_selection(bd_addr_t bd_addr){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);
    if (!connection){
        log_error("HFP HF: connection doesn't exist.");
        return;
    }
    switch (connection->hf_query_operator_state){
        case HFP_HF_QUERY_OPERATOR_FORMAT_NOT_SET:
            connection->hf_query_operator_state = HFP_HF_QUERY_OPERATOR_SET_FORMAT;
            break;
        case HFP_HF_QUERY_OPERATOR_FORMAT_SET:
            connection->hf_query_operator_state = HFP_HF_QUERY_OPERATOR_SEND_QUERY;
            break;
        default:
            break;
    }
    hfp_run_for_context(connection);
}

static void hfp_hf_set_report_extended_audio_gateway_error_result_code(bd_addr_t bd_addr, uint8_t enable){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);
    if (!connection){
        log_error("HFP HF: connection doesn't exist.");
        return;
    }
    connection->enable_extended_audio_gateway_error_report = enable;
    hfp_run_for_context(connection);
}


void hfp_hf_enable_report_extended_audio_gateway_error_result_code(bd_addr_t bd_addr){
    hfp_hf_set_report_extended_audio_gateway_error_result_code(bd_addr, 1);
}

void hfp_hf_disable_report_extended_audio_gateway_error_result_code(bd_addr_t bd_addr){
    hfp_hf_set_report_extended_audio_gateway_error_result_code(bd_addr, 0);
}


void hfp_hf_establish_audio_connection(bd_addr_t bd_addr){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);
    connection->establish_audio_connection = 0;

    if (connection->state == HFP_AUDIO_CONNECTION_ESTABLISHED) return;
    if (connection->state >= HFP_W2_DISCONNECT_SCO) return;

    if (!has_codec_negotiation_feature(connection)){
        log_info("hfp_ag_establish_audio_connection - no codec negotiation feature, using defaults");
        connection->codecs_state = HFP_CODECS_EXCHANGED;
        connection->establish_audio_connection = 1;
    } else {
        switch (connection->codecs_state){
            case HFP_CODECS_W4_AG_COMMON_CODEC:
                break;
            default:
                connection->command = HFP_CMD_TRIGGER_CODEC_CONNECTION_SETUP;
                break;
        }
    }

    hfp_run_for_context(connection);
}

void hfp_hf_release_audio_connection(bd_addr_t bd_addr){
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);
    hfp_release_audio_connection(connection);
    hfp_run_for_context(connection);
}

void hfp_hf_answer_incoming_call(bd_addr_t bd_addr){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);

    if (hfp_callsetup_status == HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS){
        connection->hf_answer_incoming_call = 1;
        hfp_run_for_context(connection);
    } else {
        log_error("HFP HF: answering incoming call with wrong callsetup status %u", hfp_callsetup_status);
    }
}

void hfp_hf_terminate_call(bd_addr_t bd_addr){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);

    // if (hfp_call_status == HFP_CALL_STATUS_ACTIVE_OR_HELD_CALL_IS_PRESENT){
    connection->hf_send_chup = 1;
    hfp_run_for_context(connection);
    // } else {
    //     log_error("HFP HF: terminating incoming call with wrong call status %u", hfp_call_status);
    // }
}

void hfp_hf_reject_call(bd_addr_t bd_addr){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);

    if (hfp_callsetup_status == HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS){
        connection->hf_send_chup = 1;
        hfp_run_for_context(connection);
    }
}

void hfp_hf_user_busy(bd_addr_t addr){
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);

    if (hfp_callsetup_status == HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS){
        connection->hf_send_chld_0 = 1;
        hfp_run_for_context(connection);
    }
}

void hfp_hf_end_active_and_accept_other(bd_addr_t addr){
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);

    if (hfp_callsetup_status == HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS ||
        hfp_call_status == HFP_CALL_STATUS_ACTIVE_OR_HELD_CALL_IS_PRESENT){
        connection->hf_send_chld_1 = 1;
        hfp_run_for_context(connection);
    }
}

void hfp_hf_swap_calls(bd_addr_t addr){
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);

    if (hfp_callsetup_status == HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS ||
        hfp_call_status == HFP_CALL_STATUS_ACTIVE_OR_HELD_CALL_IS_PRESENT){
        connection->hf_send_chld_2 = 1;
        hfp_run_for_context(connection);
    }
}

void hfp_hf_join_held_call(bd_addr_t addr){
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);

    if (hfp_callsetup_status == HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS ||
        hfp_call_status == HFP_CALL_STATUS_ACTIVE_OR_HELD_CALL_IS_PRESENT){
        connection->hf_send_chld_3 = 1;
        hfp_run_for_context(connection);
    }
}

void hfp_hf_connect_calls(bd_addr_t addr){
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);

    if (hfp_callsetup_status == HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS ||
        hfp_call_status == HFP_CALL_STATUS_ACTIVE_OR_HELD_CALL_IS_PRESENT){
        connection->hf_send_chld_4 = 1;
        hfp_run_for_context(connection);
    }
}

void hfp_hf_release_call_with_index(bd_addr_t addr, int index){
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);

    if (hfp_callsetup_status == HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS ||
        hfp_call_status == HFP_CALL_STATUS_ACTIVE_OR_HELD_CALL_IS_PRESENT){
        connection->hf_send_chld_x = 1;
        connection->hf_send_chld_x_index = 10 + index;
        hfp_run_for_context(connection);
    }
}

void hfp_hf_private_consultation_with_call(bd_addr_t addr, int index){
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);

    if (hfp_callsetup_status == HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS ||
        hfp_call_status == HFP_CALL_STATUS_ACTIVE_OR_HELD_CALL_IS_PRESENT){
        connection->hf_send_chld_x = 1;
        connection->hf_send_chld_x_index = 20 + index;
        hfp_run_for_context(connection);
    }
}

void hfp_hf_dial_number(bd_addr_t bd_addr, char * number){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);

    connection->hf_initiate_outgoing_call = 1;
    snprintf(phone_number, sizeof(phone_number), "%s", number);
    hfp_run_for_context(connection);
}

void hfp_hf_dial_memory(bd_addr_t bd_addr, char * number){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);

    connection->hf_initiate_memory_dialing = 1;
    snprintf(phone_number, sizeof(phone_number), "%s", number);
    hfp_run_for_context(connection);
}

void hfp_hf_redial_last_number(bd_addr_t bd_addr){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);

    connection->hf_initiate_redial_last_number = 1;
    hfp_run_for_context(connection);
}

void hfp_hf_activate_call_waiting_notification(bd_addr_t bd_addr){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);

    connection->hf_activate_call_waiting_notification = 1;
    hfp_run_for_context(connection);
}


void hfp_hf_deactivate_call_waiting_notification(bd_addr_t bd_addr){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);

    connection->hf_deactivate_call_waiting_notification = 1;
    hfp_run_for_context(connection);
}


void hfp_hf_activate_calling_line_notification(bd_addr_t bd_addr){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);

    connection->hf_activate_calling_line_notification = 1;
    hfp_run_for_context(connection);
}

/*
 * @brief
 */
void hfp_hf_deactivate_calling_line_notification(bd_addr_t bd_addr){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);

    connection->hf_deactivate_calling_line_notification = 1;
    hfp_run_for_context(connection);
}


/*
 * @brief
 */
void hfp_hf_activate_echo_canceling_and_noise_reduction(bd_addr_t bd_addr){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);

    connection->hf_activate_echo_canceling_and_noise_reduction = 1;
    hfp_run_for_context(connection);
}

/*
 * @brief
 */
void hfp_hf_deactivate_echo_canceling_and_noise_reduction(bd_addr_t bd_addr){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);

    connection->hf_deactivate_echo_canceling_and_noise_reduction = 1;
    hfp_run_for_context(connection);
}

/*
 * @brief
 */
void hfp_hf_activate_voice_recognition_notification(bd_addr_t bd_addr){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);

    connection->hf_activate_voice_recognition_notification = 1;
    hfp_run_for_context(connection);
}

/*
 * @brief
 */
void hfp_hf_deactivate_voice_recognition_notification(bd_addr_t bd_addr){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);

    connection->hf_deactivate_voice_recognition_notification = 1;
    hfp_run_for_context(connection);
}

/*
 * @brief
 */
void hfp_hf_set_microphone_gain(bd_addr_t bd_addr, int gain){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);
    if (connection->microphone_gain == gain) return;

    connection->microphone_gain = gain;
    connection->send_microphone_gain = 1;
    hfp_run_for_context(connection);
}

/*
 * @brief
 */
void hfp_hf_set_speaker_gain(bd_addr_t bd_addr, int gain){
    hfp_hf_establish_service_level_connection(bd_addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(bd_addr);
    if (connection->speaker_gain == gain) return;

    connection->speaker_gain = gain;
    connection->send_speaker_gain = 1;
    hfp_run_for_context(connection);
}

/*
 * @brief
 */
void hfp_hf_send_dtmf_code(bd_addr_t addr, char code){
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);
    connection->hf_send_dtmf_code = code;
    hfp_run_for_context(connection);
}

/*
 * @brief
 */
void hfp_hf_request_phone_number_for_voice_tag(bd_addr_t addr){
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);
    connection->hf_send_binp = 1;
    hfp_run_for_context(connection);
}

/*
 * @brief
 */
void hfp_hf_query_current_call_status(bd_addr_t addr){
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);
    connection->hf_send_clcc = 1;
    hfp_run_for_context(connection);
}


/*
 * @brief
 */
void hfp_hf_rrh_query_status(bd_addr_t addr){
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);
    connection->hf_send_rrh = 1;
    connection->hf_send_rrh_command = '?';
    hfp_run_for_context(connection);
}

/*
 * @brief
 */
void hfp_hf_rrh_hold_call(bd_addr_t addr){
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);
    connection->hf_send_rrh = 1;
    connection->hf_send_rrh_command = '0';
    hfp_run_for_context(connection);
}

/*
 * @brief
 */
void hfp_hf_rrh_accept_held_call(bd_addr_t addr){
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);
    connection->hf_send_rrh = 1;
    connection->hf_send_rrh_command = '1';
    hfp_run_for_context(connection);
}

/*
 * @brief
 */
void hfp_hf_rrh_reject_held_call(bd_addr_t addr)
{
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);
    connection->hf_send_rrh = 1;
    connection->hf_send_rrh_command = '2';
    hfp_run_for_context(connection);
}

/*
 * @brief
 */
void hfp_hf_query_subscriber_number(bd_addr_t addr)
{
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);
    connection->hf_send_cnum = 1;
    hfp_run_for_context(connection);
}

/*
 * @brief
 */
void hfp_hf_set_hf_indicator(bd_addr_t addr, int assigned_number, int value){
    hfp_hf_establish_service_level_connection(addr);
    hfp_connection_t * connection = get_hfp_connection_context_for_bd_addr(addr);
    // find index for assigned number
    int i;
    for (i = 0; i < hfp_indicators_nr ; i++){
        if (hfp_indicators[i] == assigned_number){
            // set value
            hfp_indicators_value[i] = value;
            // mark for update
            connection->generic_status_update_bitmap |= (1<<i);
            // send update
            hfp_run_for_context(connection);
            return;
        }
    }
}