esp-nimble-cpp/src/NimBLEAdvertising.cpp

/*
 * NimBLEAdvertising.cpp
 *
 *  Created: on March 3, 2020
 *      Author H2zero
 *
 * Originally:
 *
 * BLEAdvertising.cpp
 *
 * This class encapsulates advertising a BLE Server.
 *  Created on: Jun 21, 2017
 *      Author: kolban
 *
 */
#include "nimconfig.h"
#if (defined(CONFIG_BT_ENABLED) && \
    defined(CONFIG_BT_NIMBLE_ROLE_BROADCASTER) && \
    !CONFIG_BT_NIMBLE_EXT_ADV) || defined(_DOXYGEN_)

#if defined(CONFIG_NIMBLE_CPP_IDF)
#include "services/gap/ble_svc_gap.h"
#else
#include "nimble/nimble/host/services/gap/include/services/gap/ble_svc_gap.h"
#endif
#include "NimBLEAdvertising.h"
#include "NimBLEDevice.h"
#include "NimBLEServer.h"
#include "NimBLEUtils.h"
#include "NimBLELog.h"

static const char* LOG_TAG = "NimBLEAdvertising";


/**
 * @brief Construct a default advertising object.
 */
NimBLEAdvertising::NimBLEAdvertising() {
    reset();
} // NimBLEAdvertising


/**
 * @brief Stops the current advertising and resets the advertising data to the default values.
 */
void NimBLEAdvertising::reset() {
    if(NimBLEDevice::getInitialized() && isAdvertising()) {
        stop();
    }
    memset(&m_advData, 0, sizeof m_advData);
    memset(&m_scanData, 0, sizeof m_scanData);
    memset(&m_advParams, 0, sizeof m_advParams);
    memset(&m_slaveItvl, 0, sizeof m_slaveItvl);
    const char *name = ble_svc_gap_device_name();

    m_advData.name                   = (uint8_t *)name;
    m_advData.name_len               = strlen(name);
    m_advData.name_is_complete       = 1;
    m_advData.tx_pwr_lvl             = NimBLEDevice::getPower();
    m_advData.flags                  = (BLE_HS_ADV_F_DISC_GEN | BLE_HS_ADV_F_BREDR_UNSUP);

#if !defined(CONFIG_BT_NIMBLE_ROLE_PERIPHERAL)
    m_advParams.conn_mode            = BLE_GAP_CONN_MODE_NON;
#else
    m_advParams.conn_mode            = BLE_GAP_CONN_MODE_UND;
#endif
    m_advParams.disc_mode            = BLE_GAP_DISC_MODE_GEN;
    m_customAdvData                  = false;
    m_customScanResponseData         = false;
    m_scanResp                       = true;
    m_advDataSet                     = false;
    // Set this to non-zero to prevent auto start if host reset before started by app.
    m_duration                       = BLE_HS_FOREVER;
    m_advCompCB                      = nullptr;
} // reset


/**
 * @brief Add a service uuid to exposed list of services.
 * @param [in] serviceUUID The UUID of the service to expose.
 */
void NimBLEAdvertising::addServiceUUID(const NimBLEUUID &serviceUUID) {
    m_serviceUUIDs.push_back(serviceUUID);
    m_advDataSet = false;
} // addServiceUUID


/**
 * @brief Add a service uuid to exposed list of services.
 * @param [in] serviceUUID The string representation of the service to expose.
 */
void NimBLEAdvertising::addServiceUUID(const char* serviceUUID) {
    addServiceUUID(NimBLEUUID(serviceUUID));
    m_advDataSet = false;
} // addServiceUUID


/**
 * @brief Add a service uuid to exposed list of services.
 * @param [in] serviceUUID The UUID of the service to expose.
 */
void NimBLEAdvertising::removeServiceUUID(const NimBLEUUID &serviceUUID) {
    for(auto it = m_serviceUUIDs.begin(); it != m_serviceUUIDs.end(); ++it) {
        if((*it) == serviceUUID) {
            m_serviceUUIDs.erase(it);
            break;
        }
    }
    m_advDataSet = false;
} // addServiceUUID


/**
 * @brief Set the device appearance in the advertising data.
 * The codes for distinct appearances can be found here:\n
 * https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.characteristic.gap.appearance.xml.
 * @param [in] appearance The appearance of the device in the advertising data.
 */
void NimBLEAdvertising::setAppearance(uint16_t appearance) {
    m_advData.appearance = appearance;
    m_advData.appearance_is_present = 1;
    m_advDataSet = false;
} // setAppearance


/**
 * @brief Add the transmission power level to the advertisement packet.
 */
void NimBLEAdvertising::addTxPower() {
    m_advData.tx_pwr_lvl_is_present = 1;
    m_advDataSet = false;
} // addTxPower


/**
 * @brief Set the advertised name of the device.
 * @param [in] name The name to advertise.
 */
void NimBLEAdvertising::setName(const std::string &name) {
    m_name.assign(name.begin(), name.end());
    m_advData.name = &m_name[0];
    m_advData.name_len = m_name.size();
    m_advDataSet = false;
} // setName


/**
 * @brief Set the advertised manufacturer data.
 * @param [in] data The data to advertise.
 */
void NimBLEAdvertising::setManufacturerData(const std::string &data) {
    m_mfgData.assign(data.begin(), data.end());
    m_advData.mfg_data = &m_mfgData[0];
    m_advData.mfg_data_len = m_mfgData.size();
    m_advDataSet = false;
} // setManufacturerData


/**
 * @brief Set the advertised URI.
 * @param [in] uri The URI to advertise.
 */
void NimBLEAdvertising::setURI(const std::string &uri) {
    m_uri.assign(uri.begin(), uri.end());
    m_advData.uri = &m_uri[0];
    m_advData.uri_len = m_uri.size();
    m_advDataSet = false;
} // setURI


/**
 * @brief Set the service data advertised for the UUID.
 * @param [in] uuid The UUID the service data belongs to.
 * @param [in] data The data to advertise.
 * @note If data length is 0 the service data will not be advertised.
 */
void NimBLEAdvertising::setServiceData(const NimBLEUUID &uuid, const std::string &data) {
    switch (uuid.bitSize()) {
        case 16: {
            m_svcData16.assign((uint8_t*)&uuid.getNative()->u16.value, (uint8_t*)&uuid.getNative()->u16.value + 2);
            m_svcData16.insert(m_svcData16.end(), data.begin(), data.end());
            m_advData.svc_data_uuid16 = (uint8_t*)&m_svcData16[0];
            m_advData.svc_data_uuid16_len = (data.length() > 0) ? m_svcData16.size() : 0;
            break;
        }

        case 32: {
            m_svcData32.assign((uint8_t*)&uuid.getNative()->u32.value, (uint8_t*)&uuid.getNative()->u32.value + 4);
            m_svcData32.insert(m_svcData32.end(), data.begin(), data.end());
            m_advData.svc_data_uuid32 = (uint8_t*)&m_svcData32[0];
            m_advData.svc_data_uuid32_len = (data.length() > 0) ? m_svcData32.size() : 0;
            break;
        }

        case 128: {
            m_svcData128.assign(uuid.getNative()->u128.value, uuid.getNative()->u128.value + 16);
            m_svcData128.insert(m_svcData128.end(), data.begin(), data.end());
            m_advData.svc_data_uuid128 = (uint8_t*)&m_svcData128[0];
            m_advData.svc_data_uuid128_len = (data.length() > 0) ? m_svcData128.size() : 0;
            break;
        }

        default:
            return;
    }

    m_advDataSet = false;
} // setServiceData


/**
 * @brief Set the type of advertisment to use.
 * @param [in] adv_type:
 * * BLE_GAP_CONN_MODE_NON    (0) - not connectable advertising
 * * BLE_GAP_CONN_MODE_DIR    (1) - directed connectable advertising
 * * BLE_GAP_CONN_MODE_UND    (2) - undirected connectable advertising
 */
void NimBLEAdvertising::setAdvertisementType(uint8_t adv_type){
    m_advParams.conn_mode = adv_type;
} // setAdvertisementType


/**
 * @brief Set the minimum advertising interval.
 * @param [in] mininterval Minimum value for advertising interval in 0.625ms units, 0 = use default.
 */
void NimBLEAdvertising::setMinInterval(uint16_t mininterval) {
    m_advParams.itvl_min = mininterval;
} // setMinInterval


/**
 * @brief Set the maximum advertising interval.
 * @param [in] maxinterval Maximum value for advertising interval in 0.625ms units, 0 = use default.
 */
void NimBLEAdvertising::setMaxInterval(uint16_t maxinterval) {
    m_advParams.itvl_max = maxinterval;
} // setMaxInterval


/**
 * @brief Set the advertised min connection interval preferred by this device.
 * @param [in] mininterval the max interval value. Range = 0x0006 to 0x0C80.
 * @details Values not within the range will cancel advertising of this data.\n
 * Consumes 6 bytes of advertising space (combined with max interval).
 */
void NimBLEAdvertising::setMinPreferred(uint16_t mininterval) {
    // invalid paramters, set the slave interval to null
    if(mininterval < 0x0006 || mininterval > 0x0C80) {
        m_advData.slave_itvl_range = nullptr;
        return;
    }

    if(m_advData.slave_itvl_range == nullptr) {
        m_advData.slave_itvl_range = m_slaveItvl;
    }

    m_slaveItvl[0] = mininterval;
    m_slaveItvl[1] = mininterval >> 8;

    uint16_t maxinterval = *(uint16_t*)(m_advData.slave_itvl_range+2);

    // If mininterval is higher than the maxinterval make them the same
    if(mininterval > maxinterval) {
        m_slaveItvl[2] = m_slaveItvl[0];
        m_slaveItvl[3] = m_slaveItvl[1];
    }

    m_advDataSet = false;
} // setMinPreferred


/**
 * @brief Set the advertised max connection interval preferred by this device.
 * @param [in] maxinterval the max interval value. Range = 0x0006 to 0x0C80.
 * @details Values not within the range will cancel advertising of this data.\n
 * Consumes 6 bytes of advertising space (combined with min interval).
 */
void NimBLEAdvertising::setMaxPreferred(uint16_t maxinterval) {
    // invalid paramters, set the slave interval to null
    if(maxinterval < 0x0006 || maxinterval > 0x0C80) {
        m_advData.slave_itvl_range = nullptr;
        return;
    }
    if(m_advData.slave_itvl_range == nullptr) {
        m_advData.slave_itvl_range = m_slaveItvl;
    }
    m_slaveItvl[2] = maxinterval;
    m_slaveItvl[3] = maxinterval >> 8;

    uint16_t mininterval = *(uint16_t*)(m_advData.slave_itvl_range);

    // If mininterval is higher than the maxinterval make them the same
    if(mininterval > maxinterval) {
        m_slaveItvl[0] = m_slaveItvl[2];
        m_slaveItvl[1] = m_slaveItvl[3];
    }

    m_advDataSet = false;
} // setMaxPreferred


/**
 * @brief Set if scan response is available.
 * @param [in] set true = scan response available.
 */
void NimBLEAdvertising::setScanResponse(bool set) {
    m_scanResp = set;
    m_advDataSet = false;
} // setScanResponse


/**
 * @brief Set the filtering for the scan filter.
 * @param [in] scanRequestWhitelistOnly If true, only allow scan requests from those on the white list.
 * @param [in] connectWhitelistOnly If true, only allow connections from those on the white list.
 */
void NimBLEAdvertising::setScanFilter(bool scanRequestWhitelistOnly, bool connectWhitelistOnly) {
    NIMBLE_LOGD(LOG_TAG, ">> setScanFilter: scanRequestWhitelistOnly: %d, connectWhitelistOnly: %d",
                scanRequestWhitelistOnly, connectWhitelistOnly);
    if (!scanRequestWhitelistOnly && !connectWhitelistOnly) {
        m_advParams.filter_policy = BLE_HCI_ADV_FILT_NONE;
        NIMBLE_LOGD(LOG_TAG, "<< setScanFilter");
        return;
    }
    if (scanRequestWhitelistOnly && !connectWhitelistOnly) {
        m_advParams.filter_policy = BLE_HCI_ADV_FILT_SCAN;
        NIMBLE_LOGD(LOG_TAG, "<< setScanFilter");
        return;
    }
    if (!scanRequestWhitelistOnly && connectWhitelistOnly) {
        m_advParams.filter_policy = BLE_HCI_ADV_FILT_CONN;
        NIMBLE_LOGD(LOG_TAG, "<< setScanFilter");
        return;
    }
    if (scanRequestWhitelistOnly && connectWhitelistOnly) {
        m_advParams.filter_policy = BLE_HCI_ADV_FILT_BOTH;
        NIMBLE_LOGD(LOG_TAG, "<< setScanFilter");
        return;
    }
} // setScanFilter


/**
 * @brief Set the advertisement data that is to be published in a regular advertisement.
 * @param [in] advertisementData The data to be advertised.
 * @details The use of this function will replace any data set with addServiceUUID\n
 * or setAppearance. If you wish for these to be advertised you must include them\n
 * in the advertisementData parameter sent.
 */

void NimBLEAdvertising::setAdvertisementData(NimBLEAdvertisementData& advertisementData) {
    NIMBLE_LOGD(LOG_TAG, ">> setAdvertisementData");
    int rc = ble_gap_adv_set_data(
        (uint8_t*)advertisementData.getPayload().data(),
        advertisementData.getPayload().length());
    if (rc != 0) {
        NIMBLE_LOGE(LOG_TAG, "ble_gap_adv_set_data: %d %s",
                    rc, NimBLEUtils::returnCodeToString(rc));
    }
    m_customAdvData = true;   // Set the flag that indicates we are using custom advertising data.
    NIMBLE_LOGD(LOG_TAG, "<< setAdvertisementData");
} // setAdvertisementData


/**
 * @brief Set the advertisement data that is to be published in a scan response.
 * @param [in] advertisementData The data to be advertised.
 * @details Calling this without also using setAdvertisementData will have no effect.\n
 * When using custom scan response data you must also use custom advertisement data.
 */
void NimBLEAdvertising::setScanResponseData(NimBLEAdvertisementData& advertisementData) {
    NIMBLE_LOGD(LOG_TAG, ">> setScanResponseData");
    int rc = ble_gap_adv_rsp_set_data(
        (uint8_t*)advertisementData.getPayload().data(),
        advertisementData.getPayload().length());
    if (rc != 0) {
        NIMBLE_LOGE(LOG_TAG, "ble_gap_adv_rsp_set_data: %d %s",
                    rc,  NimBLEUtils::returnCodeToString(rc));
    }
    m_customScanResponseData = true;   // Set the flag that indicates we are using custom scan response data.
    NIMBLE_LOGD(LOG_TAG, "<< setScanResponseData");
} // setScanResponseData


/**
 * @brief Start advertising.
 * @param [in] duration The duration, in milliseconds, to advertise, 0 == advertise forever.
 * @param [in] advCompleteCB A pointer to a callback to be invoked when advertising ends.
 * @return True if advertising started successfully.
 */
bool NimBLEAdvertising::start(uint32_t duration, void (*advCompleteCB)(NimBLEAdvertising *pAdv)) {
    NIMBLE_LOGD(LOG_TAG, ">> Advertising start: customAdvData: %d, customScanResponseData: %d",
                m_customAdvData, m_customScanResponseData);

    // If Host is not synced we cannot start advertising.
    if(!NimBLEDevice::m_synced) {
        NIMBLE_LOGE(LOG_TAG, "Host reset, wait for sync.");
        return false;
    }

#if defined(CONFIG_BT_NIMBLE_ROLE_PERIPHERAL)
    NimBLEServer* pServer = NimBLEDevice::getServer();
    if(pServer != nullptr) {
        if(!pServer->m_gattsStarted){
            pServer->start();
        } else if(pServer->getConnectedCount() >= NIMBLE_MAX_CONNECTIONS) {
            NIMBLE_LOGE(LOG_TAG, "Max connections reached - not advertising");
            return false;
        }
    }
#endif

    // If already advertising just return
    if(ble_gap_adv_active()) {
        NIMBLE_LOGW(LOG_TAG, "Advertising already active");
        return true;
    }

    // Save the duration incase of host reset so we can restart with the same params
    m_duration = duration;

    if(duration == 0){
        duration = BLE_HS_FOREVER;
    }

    m_advCompCB = advCompleteCB;

    m_advParams.disc_mode = BLE_GAP_DISC_MODE_GEN;
    m_advData.flags = (BLE_HS_ADV_F_DISC_GEN | BLE_HS_ADV_F_BREDR_UNSUP);
    if(m_advParams.conn_mode == BLE_GAP_CONN_MODE_NON) {
        if(!m_scanResp) {
            m_advParams.disc_mode = BLE_GAP_DISC_MODE_NON;
            // non-connectable advertising does not require AD flags.
            m_advData.flags = 0;
        }
    }

    int rc = 0;

    if (!m_customAdvData && !m_advDataSet) {
        //start with 3 bytes for the flags data if required
        uint8_t payloadLen = (m_advData.flags > 0) ? (2 + 1) : 0;
        if(m_advData.mfg_data_len > 0)
            payloadLen += (2 + m_advData.mfg_data_len);

        if(m_advData.svc_data_uuid16_len > 0)
            payloadLen += (2 + m_advData.svc_data_uuid16_len);

        if(m_advData.svc_data_uuid32_len > 0)
            payloadLen += (2 + m_advData.svc_data_uuid32_len);

        if(m_advData.svc_data_uuid128_len > 0)
            payloadLen += (2 + m_advData.svc_data_uuid128_len);

        if(m_advData.uri_len > 0)
            payloadLen += (2 + m_advData.uri_len);

        if(m_advData.appearance_is_present)
            payloadLen += (2 + BLE_HS_ADV_APPEARANCE_LEN);

        if(m_advData.tx_pwr_lvl_is_present)
            payloadLen += (2 + BLE_HS_ADV_TX_PWR_LVL_LEN);

        if(m_advData.slave_itvl_range != nullptr)
            payloadLen += (2 + BLE_HS_ADV_SLAVE_ITVL_RANGE_LEN);

        for(auto &it : m_serviceUUIDs) {
            if(it.getNative()->u.type == BLE_UUID_TYPE_16) {
                int add = (m_advData.num_uuids16 > 0) ? 2 : 4;
                if((payloadLen + add) > BLE_HS_ADV_MAX_SZ){
                    m_advData.uuids16_is_complete = 0;
                    continue;
                }
                payloadLen += add;

                if(nullptr == (m_advData.uuids16 = (ble_uuid16_t*)realloc((void*)m_advData.uuids16,
                                                   (m_advData.num_uuids16 + 1) * sizeof(ble_uuid16_t))))
                {
                    NIMBLE_LOGC(LOG_TAG, "Error, no mem");
                    abort();
                }
                memcpy((void*)&m_advData.uuids16[m_advData.num_uuids16],
                       &it.getNative()->u16, sizeof(ble_uuid16_t));
                m_advData.uuids16_is_complete = 1;
                m_advData.num_uuids16++;
            }
            if(it.getNative()->u.type == BLE_UUID_TYPE_32) {
                int add = (m_advData.num_uuids32 > 0) ? 4 : 6;
                if((payloadLen + add) > BLE_HS_ADV_MAX_SZ){
                    m_advData.uuids32_is_complete = 0;
                    continue;
                }
                payloadLen += add;

                if(nullptr == (m_advData.uuids32 = (ble_uuid32_t*)realloc((void*)m_advData.uuids32,
                                                   (m_advData.num_uuids32 + 1) * sizeof(ble_uuid32_t))))
                {
                    NIMBLE_LOGC(LOG_TAG, "Error, no mem");
                    abort();
                }
                memcpy((void*)&m_advData.uuids32[m_advData.num_uuids32],
                       &it.getNative()->u32, sizeof(ble_uuid32_t));
                m_advData.uuids32_is_complete = 1;
                m_advData.num_uuids32++;
            }
            if(it.getNative()->u.type == BLE_UUID_TYPE_128){
                int add = (m_advData.num_uuids128 > 0) ? 16 : 18;
                if((payloadLen + add) > BLE_HS_ADV_MAX_SZ){
                    m_advData.uuids128_is_complete = 0;
                    continue;
                }
                payloadLen += add;

                if(nullptr == (m_advData.uuids128 = (ble_uuid128_t*)realloc((void*)m_advData.uuids128,
                              (m_advData.num_uuids128 + 1) * sizeof(ble_uuid128_t))))
                {
                    NIMBLE_LOGC(LOG_TAG, "Error, no mem");
                    abort();
                }
                memcpy((void*)&m_advData.uuids128[m_advData.num_uuids128],
                       &it.getNative()->u128, sizeof(ble_uuid128_t));
                m_advData.uuids128_is_complete = 1;
                m_advData.num_uuids128++;
            }
        }

        // check if there is room for the name, if not put it in scan data
        if((payloadLen + (2 + m_advData.name_len)) > BLE_HS_ADV_MAX_SZ) {
            if(m_scanResp && !m_customScanResponseData){
                m_scanData.name = m_advData.name;
                m_scanData.name_len = m_advData.name_len;
                if(m_scanData.name_len > BLE_HS_ADV_MAX_SZ - 2) {
                    m_scanData.name_len = BLE_HS_ADV_MAX_SZ - 2;
                    m_scanData.name_is_complete = 0;
                } else {
                    m_scanData.name_is_complete = 1;
                }
                m_advData.name = nullptr;
                m_advData.name_len = 0;
                m_advData.name_is_complete = 0;
            } else {
                if(m_advData.tx_pwr_lvl_is_present) {
                    m_advData.tx_pwr_lvl_is_present = 0;
                    payloadLen -= (2 + 1);
                }
                // if not using scan response just cut the name down
                // leaving 2 bytes for the data specifier.
                if(m_advData.name_len > (BLE_HS_ADV_MAX_SZ - payloadLen - 2)) {
                    m_advData.name_len = (BLE_HS_ADV_MAX_SZ - payloadLen - 2);
                    m_advData.name_is_complete = 0;
                }
            }
        }

        if(m_scanResp && !m_customScanResponseData) {
            rc = ble_gap_adv_rsp_set_fields(&m_scanData);
            switch(rc) {
                case 0:
                    break;

                case BLE_HS_EBUSY:
                    NIMBLE_LOGE(LOG_TAG, "Already advertising");
                    break;

                case BLE_HS_EMSGSIZE:
                    NIMBLE_LOGE(LOG_TAG, "Scan data too long");
                    break;

                default:
                    NIMBLE_LOGE(LOG_TAG, "Error setting scan response data; rc=%d, %s",
                                rc, NimBLEUtils::returnCodeToString(rc));
                    break;
            }
        }

        if(rc == 0) {
            rc = ble_gap_adv_set_fields(&m_advData);
            switch(rc) {
                case 0:
                    break;

                case BLE_HS_EBUSY:
                    NIMBLE_LOGE(LOG_TAG, "Already advertising");
                    break;

                case BLE_HS_EMSGSIZE:
                    NIMBLE_LOGE(LOG_TAG, "Advertisement data too long");
                    break;

                default:
                    NIMBLE_LOGE(LOG_TAG, "Error setting advertisement data; rc=%d, %s",
                                rc, NimBLEUtils::returnCodeToString(rc));
                    break;
            }
        }

        if(m_advData.num_uuids128 > 0) {
            free((void*)m_advData.uuids128);
            m_advData.uuids128 = nullptr;
            m_advData.num_uuids128 = 0;
        }

        if(m_advData.num_uuids32 > 0) {
            free((void*)m_advData.uuids32);
            m_advData.uuids32 = nullptr;
            m_advData.num_uuids32 = 0;
        }

        if(m_advData.num_uuids16 > 0) {
            free((void*)m_advData.uuids16);
            m_advData.uuids16 = nullptr;
            m_advData.num_uuids16 = 0;
        }

        if(rc !=0) {
            return false;
        }

        m_advDataSet = true;
    }

#if defined(CONFIG_BT_NIMBLE_ROLE_PERIPHERAL)
    rc = ble_gap_adv_start(NimBLEDevice::m_own_addr_type, NULL, duration,
                           &m_advParams,
                           (pServer != nullptr) ? NimBLEServer::handleGapEvent :
                                                  NimBLEAdvertising::handleGapEvent,
                           (void*)this);
#else
    rc = ble_gap_adv_start(NimBLEDevice::m_own_addr_type, NULL, duration,
                           &m_advParams, NimBLEAdvertising::handleGapEvent, this);
#endif
    switch(rc) {
        case 0:
             break;

        case BLE_HS_EALREADY:
             NIMBLE_LOGI(LOG_TAG, "Advertisement Already active");
             break;

        case BLE_HS_EINVAL:
             NIMBLE_LOGE(LOG_TAG, "Unable to advertise - Duration too long");
             break;

        case BLE_HS_EPREEMPTED:
             NIMBLE_LOGE(LOG_TAG, "Unable to advertise - busy");
             break;

        case BLE_HS_ETIMEOUT_HCI:
        case BLE_HS_EOS:
        case BLE_HS_ECONTROLLER:
        case BLE_HS_ENOTSYNCED:
             NIMBLE_LOGE(LOG_TAG, "Unable to advertise - Host Reset");
             break;

        default:
            NIMBLE_LOGE(LOG_TAG, "Error enabling advertising; rc=%d, %s",
                        rc, NimBLEUtils::returnCodeToString(rc));
            break;
    }

    NIMBLE_LOGD(LOG_TAG, "<< Advertising start");
    return (rc == 0 || rc == BLE_HS_EALREADY);
} // start


/**
 * @brief Stop advertising.
 * @return True if advertising stopped successfully.
 */
bool NimBLEAdvertising::stop() {
    NIMBLE_LOGD(LOG_TAG, ">> stop");

    int rc = ble_gap_adv_stop();
    if (rc != 0 && rc != BLE_HS_EALREADY) {
        NIMBLE_LOGE(LOG_TAG, "ble_gap_adv_stop rc=%d %s",
                    rc, NimBLEUtils::returnCodeToString(rc));
        return false;
    }

    NIMBLE_LOGD(LOG_TAG, "<< stop");
    return true;
} // stop


/**
 * @brief Handles the callback when advertising stops.
 */
void NimBLEAdvertising::advCompleteCB() {
    if(m_advCompCB != nullptr) {
        m_advCompCB(this);
    }
} // advCompleteCB


/**
 * @brief Check if currently advertising.
 * @return true if advertising is active.
 */
bool NimBLEAdvertising::isAdvertising() {
    return ble_gap_adv_active();
} // isAdvertising


/*
 * Host reset seems to clear advertising data,
 * we need clear the flag so it reloads it.
 */
void NimBLEAdvertising::onHostSync() {
    NIMBLE_LOGD(LOG_TAG, "Host re-synced");

    m_advDataSet = false;
    // If we were advertising forever, restart it now
    if(m_duration == 0) {
        start(m_duration, m_advCompCB);
    } else {
    // Otherwise we should tell the app that advertising stopped.
        advCompleteCB();
    }
} // onHostSync


/**
 * @brief Handler for gap events when not using peripheral role.
 * @param [in] event the event data.
 * @param [in] arg pointer to the advertising instance.
 */
/*STATIC*/
int NimBLEAdvertising::handleGapEvent(struct ble_gap_event *event, void *arg) {
    NimBLEAdvertising *pAdv = (NimBLEAdvertising*)arg;

    if(event->type == BLE_GAP_EVENT_ADV_COMPLETE) {
        switch(event->adv_complete.reason) {
            // Don't call the callback if host reset, we want to
            // preserve the active flag until re-sync to restart advertising.
            case BLE_HS_ETIMEOUT_HCI:
            case BLE_HS_EOS:
            case BLE_HS_ECONTROLLER:
            case BLE_HS_ENOTSYNCED:
                NIMBLE_LOGC(LOG_TAG, "host reset, rc=%d", event->adv_complete.reason);
                NimBLEDevice::onReset(event->adv_complete.reason);
                return 0;
            default:
                break;
        }
        pAdv->advCompleteCB();
    }
    return 0;
}


/**
 * @brief Add data to the payload to be advertised.
 * @param [in] data The data to be added to the payload.
 */
void NimBLEAdvertisementData::addData(const std::string &data) {
    if ((m_payload.length() + data.length()) > BLE_HS_ADV_MAX_SZ) {
        NIMBLE_LOGE(LOG_TAG, "Advertisement data length exceeded");
        return;
    }
    m_payload.append(data);
} // addData


/**
 * @brief Add data to the payload to be advertised.
 * @param [in] data The data to be added to the payload.
 * @param [in] length The size of data to be added to the payload.
 */
void NimBLEAdvertisementData::addData(char * data, size_t length) {
    addData(std::string(data, length));
} // addData


/**
 * @brief Set the appearance.
 * @param [in] appearance The appearance code value.
 *
 * See also:
 * https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.characteristic.gap.appearance.xml
 */
void NimBLEAdvertisementData::setAppearance(uint16_t appearance) {
    char cdata[2];
    cdata[0] = 3;
    cdata[1] = BLE_HS_ADV_TYPE_APPEARANCE; // 0x19
    addData(std::string(cdata, 2) + std::string((char*) &appearance, 2));
} // setAppearance


/**
 * @brief Set the advertisement flags.
 * @param [in] flag The flags to be set in the advertisement.
 * * BLE_HS_ADV_F_DISC_LTD
 * * BLE_HS_ADV_F_DISC_GEN
 * * BLE_HS_ADV_F_BREDR_UNSUP - must always use with NimBLE
 */
void NimBLEAdvertisementData::setFlags(uint8_t flag) {
    char cdata[3];
    cdata[0] = 2;
    cdata[1] = BLE_HS_ADV_TYPE_FLAGS;  // 0x01
    cdata[2] = flag | BLE_HS_ADV_F_BREDR_UNSUP;
    addData(std::string(cdata, 3));
} // setFlag


/**
 * @brief Set manufacturer specific data.
 * @param [in] data The manufacturer data to advertise.
 */
void NimBLEAdvertisementData::setManufacturerData(const std::string &data) {
    char cdata[2];
    cdata[0] = data.length() + 1;
    cdata[1] = BLE_HS_ADV_TYPE_MFG_DATA ;  // 0xff
    addData(std::string(cdata, 2) + data);
} // setManufacturerData


/**
 * @brief Set the URI to advertise.
 * @param [in] uri The uri to advertise.
 */
void NimBLEAdvertisementData::setURI(const std::string &uri) {
    char cdata[2];
    cdata[0] = uri.length() + 1;
    cdata[1] = BLE_HS_ADV_TYPE_URI;
    addData(std::string(cdata, 2) + uri);
} // setURI


/**
 * @brief Set the complete name of this device.
 * @param [in] name The name to advertise.
 */
void NimBLEAdvertisementData::setName(const std::string &name) {
    char cdata[2];
    cdata[0] = name.length() + 1;
    cdata[1] = BLE_HS_ADV_TYPE_COMP_NAME;  // 0x09
    addData(std::string(cdata, 2) + name);
} // setName


/**
 * @brief Set a single service to advertise as a complete list of services.
 * @param [in] uuid The service to advertise.
 */
void NimBLEAdvertisementData::setCompleteServices(const NimBLEUUID &uuid) {
    setServices(true, uuid.bitSize(), {uuid});
} // setCompleteServices


/**
 * @brief Set the complete list of 16 bit services to advertise.
 * @param [in] v_uuid A vector of 16 bit UUID's to advertise.
 */
void NimBLEAdvertisementData::setCompleteServices16(const std::vector<NimBLEUUID>& v_uuid) {
    setServices(true, 16, v_uuid);
} // setCompleteServices16


/**
 * @brief Set the complete list of 32 bit services to advertise.
 * @param [in] v_uuid A vector of 32 bit UUID's to advertise.
 */
void NimBLEAdvertisementData::setCompleteServices32(const std::vector<NimBLEUUID>& v_uuid) {
    setServices(true, 32, v_uuid);
} // setCompleteServices32


/**
 * @brief Set a single service to advertise as a partial list of services.
 * @param [in] uuid The service to advertise.
 */
void NimBLEAdvertisementData::setPartialServices(const NimBLEUUID &uuid) {
    setServices(false, uuid.bitSize(), {uuid});
} // setPartialServices


/**
 * @brief Set the partial list of services to advertise.
 * @param [in] v_uuid A vector of 16 bit UUID's to advertise.
 */
void NimBLEAdvertisementData::setPartialServices16(const std::vector<NimBLEUUID>& v_uuid) {
    setServices(false, 16, v_uuid);
} // setPartialServices16


/**
 * @brief Set the partial list of services to advertise.
 * @param [in] v_uuid A vector of 32 bit UUID's to advertise.
 */
void NimBLEAdvertisementData::setPartialServices32(const std::vector<NimBLEUUID>& v_uuid) {
    setServices(false, 32, v_uuid);
} // setPartialServices32


/**
 * @brief Utility function to create the list of service UUID's from a vector.
 * @param [in] complete If true the vector is the complete set of services.
 * @param [in] size The bit size of the UUID's in the vector. (16, 32, or 128).
 * @param [in] v_uuid The vector of service UUID's to advertise.
 */
void NimBLEAdvertisementData::setServices(const bool complete, const uint8_t size,
                                          const std::vector<NimBLEUUID> &v_uuid)
{
    char cdata[2];
    cdata[0] = (size / 8) * v_uuid.size() + 1;
    switch(size) {
        case 16:
            cdata[1] = complete ? BLE_HS_ADV_TYPE_COMP_UUIDS16 : BLE_HS_ADV_TYPE_INCOMP_UUIDS16;
            break;
        case 32:
            cdata[1] = complete ? BLE_HS_ADV_TYPE_COMP_UUIDS32 : BLE_HS_ADV_TYPE_INCOMP_UUIDS32;
            break;
        case 128:
            cdata[1] = complete ? BLE_HS_ADV_TYPE_COMP_UUIDS128 : BLE_HS_ADV_TYPE_INCOMP_UUIDS128;
            break;
        default:
            return;
    }

    std::string uuids;

    for(auto &it : v_uuid){
        if(it.bitSize() != size) {
            NIMBLE_LOGE(LOG_TAG, "Service UUID(%d) invalid", size);
            return;
        } else {
            switch(size) {
                case 16:
                    uuids += std::string((char*)&it.getNative()->u16.value, 2);
                    break;
                case 32:
                    uuids += std::string((char*)&it.getNative()->u32.value, 4);
                    break;
                case 128:
                    uuids += std::string((char*)&it.getNative()->u128.value, 16);
                    break;
                default:
                    return;
            }
        }
    }

    addData(std::string(cdata, 2) + uuids);
} // setServices


/**
 * @brief Set the service data (UUID + data)
 * @param [in] uuid The UUID to set with the service data.
 * @param [in] data The data to be associated with the service data advertised.
 */
void NimBLEAdvertisementData::setServiceData(const NimBLEUUID &uuid, const std::string &data) {
    char cdata[2];
    switch (uuid.bitSize()) {
        case 16: {
            // [Len] [0x16] [UUID16] data
            cdata[0] = data.length() + 3;
            cdata[1] = BLE_HS_ADV_TYPE_SVC_DATA_UUID16;  // 0x16
            addData(std::string(cdata, 2) + std::string((char*) &uuid.getNative()->u16.value, 2) + data);
            break;
        }

        case 32: {
            // [Len] [0x20] [UUID32] data
            cdata[0] = data.length() + 5;
            cdata[1] = BLE_HS_ADV_TYPE_SVC_DATA_UUID32; // 0x20
            addData(std::string(cdata, 2) + std::string((char*) &uuid.getNative()->u32.value, 4) + data);
            break;
        }

        case 128: {
            // [Len] [0x21] [UUID128] data
            cdata[0] = data.length() + 17;
            cdata[1] = BLE_HS_ADV_TYPE_SVC_DATA_UUID128;  // 0x21
            addData(std::string(cdata, 2) + std::string((char*) &uuid.getNative()->u128.value, 16) + data);
            break;
        }

        default:
            return;
    }
} // setServiceData


/**
 * @brief Set the short name.
 * @param [in] name The short name of the device.
 */
void NimBLEAdvertisementData::setShortName(const std::string &name) {
    char cdata[2];
    cdata[0] = name.length() + 1;
    cdata[1] = BLE_HS_ADV_TYPE_INCOMP_NAME;  // 0x08
    addData(std::string(cdata, 2) + name);
} // setShortName


/**
 * @brief Adds Tx power level to the advertisement data.
 */
void NimBLEAdvertisementData::addTxPower() {
    char cdata[3];
    cdata[0] = BLE_HS_ADV_TX_PWR_LVL_LEN + 1;
    cdata[1] = BLE_HS_ADV_TYPE_TX_PWR_LVL;
    cdata[2] = NimBLEDevice::getPower();
    addData(cdata, 3);
} // addTxPower


/**
 * @brief Set the preferred connection interval parameters.
 * @param [in] min The minimum interval desired.
 * @param [in] max The maximum interval desired.
 */
void NimBLEAdvertisementData::setPreferredParams(uint16_t min, uint16_t max) {
    char cdata[6];
    cdata[0] = BLE_HS_ADV_SLAVE_ITVL_RANGE_LEN + 1;
    cdata[1] = BLE_HS_ADV_TYPE_SLAVE_ITVL_RANGE;
    cdata[2] = min;
    cdata[3] = min >> 8;
    cdata[4] = max;
    cdata[5] = max >> 8;
    addData(cdata, 6);
} // setPreferredParams


/**
 * @brief Retrieve the payload that is to be advertised.
 * @return The payload that is to be advertised.
 */
std::string NimBLEAdvertisementData::getPayload() {
    return m_payload;
} // getPayload

#endif /* CONFIG_BT_ENABLED && CONFIG_BT_NIMBLE_ROLE_BROADCASTER  && !CONFIG_BT_NIMBLE_EXT_ADV */