STM32duinoBLE/src/BLEAdvertisingData.cpp at main · stm32duino/STM32duinoBLE · GitHub

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This file is part of the ArduinoBLE library.

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

#include "BLEAdvertisingData.h"

#define AD_FIELD_OVERHEAD (2)

BLEAdvertisingData::BLEAdvertisingData() :

_dataLength(0),

_remainingLength(MAX_AD_DATA_LENGTH),

_rawData(NULL),

_rawDataLength(0),

_flags(0),

_hasFlags(false),

_localName(NULL),

_manufacturerData(NULL),

_manufacturerDataLength(0),

_manufacturerCompanyId(0),

_hasManufacturerCompanyId(false),

_advertisedServiceUuid(NULL),

_advertisedServiceUuidLength(0),

_serviceData(NULL),

_serviceDataLength(0)

{

}

BLEAdvertisingData::~BLEAdvertisingData()

{

}

inline bool BLEAdvertisingData::updateRemainingLength(int oldFieldLength, int newFieldLength)

{

int updatedRemaining = _remainingLength + (oldFieldLength - newFieldLength);

if (updatedRemaining >= 0) {

_remainingLength = updatedRemaining;

return true;

}

return false;

}

int BLEAdvertisingData::remainingLength() const

{

return _remainingLength;

}

int BLEAdvertisingData::availableForWrite()

{

int available = (_remainingLength - AD_FIELD_OVERHEAD);

if (available < 0) available = 0;

return available;

}

void BLEAdvertisingData::clear()

{

_remainingLength = MAX_AD_DATA_LENGTH;

_rawData = NULL;

_rawDataLength = 0;

_hasFlags = false;

_localName = NULL;

_manufacturerData = NULL;

_manufacturerDataLength = 0;

_hasManufacturerCompanyId = false;

_advertisedServiceUuid = NULL;

_advertisedServiceUuidLength = 0;

_serviceData = NULL;

_serviceDataLength = 0;

}

void BLEAdvertisingData::copy(const BLEAdvertisingData& adv)

{

_remainingLength = adv._remainingLength;

_rawData = adv._rawData;

_rawDataLength = adv._rawDataLength;

_flags = adv._flags;

_hasFlags = adv._hasFlags;

_localName = adv._localName;

_manufacturerData = adv._manufacturerData;

_manufacturerDataLength = adv._manufacturerDataLength;

_manufacturerCompanyId = adv._manufacturerCompanyId;

_hasManufacturerCompanyId = adv._hasManufacturerCompanyId;

_advertisedServiceUuid = adv._advertisedServiceUuid;

_advertisedServiceUuidLength = adv._advertisedServiceUuidLength;

_serviceDataUuid = adv._serviceDataUuid;

_serviceData = adv._serviceData;

_serviceDataLength = adv._serviceDataLength;

}

BLEAdvertisingData& BLEAdvertisingData::operator=(const BLEAdvertisingData &other)

{

copy(other);

return *this;

}

bool BLEAdvertisingData::setAdvertisedServiceUuid(const char* advertisedServiceUuid)

{

BLEUuid uuid(advertisedServiceUuid);

int previousLength = (_advertisedServiceUuidLength > 0) ? (_advertisedServiceUuidLength + AD_FIELD_OVERHEAD) : 0;

bool success = updateRemainingLength(previousLength, (uuid.length() + AD_FIELD_OVERHEAD));

if (success) {

_advertisedServiceUuid = advertisedServiceUuid;

_advertisedServiceUuidLength = uuid.length();

}

return success;

}

bool BLEAdvertisingData::setAdvertisedService(const BLEService& service)

{

return setAdvertisedServiceUuid(service.uuid());

}

bool BLEAdvertisingData::setManufacturerData(const uint8_t manufacturerData[], int manufacturerDataLength)

{

int previousLength = 0;

if (_manufacturerDataLength) {

previousLength = _manufacturerDataLength + AD_FIELD_OVERHEAD;

if (_hasManufacturerCompanyId) {

previousLength += sizeof(_manufacturerCompanyId);

}

bool success = updateRemainingLength(previousLength, (manufacturerDataLength + AD_FIELD_OVERHEAD));

if (success) {

_manufacturerData = manufacturerData;

_manufacturerDataLength = manufacturerDataLength;

_hasManufacturerCompanyId = false;

}

return success;

}

bool BLEAdvertisingData::setManufacturerData(const uint16_t companyId, const uint8_t manufacturerData[], int manufacturerDataLength)

{

int previousLength = 0;

if (_manufacturerDataLength) {

previousLength = _manufacturerDataLength + AD_FIELD_OVERHEAD;

if (_hasManufacturerCompanyId) {

previousLength += sizeof(_manufacturerCompanyId);

}

bool success = updateRemainingLength(previousLength, (manufacturerDataLength + sizeof(companyId) + AD_FIELD_OVERHEAD));

if (success) {

_manufacturerData = manufacturerData;

_manufacturerDataLength = manufacturerDataLength;

_manufacturerCompanyId = companyId;

_hasManufacturerCompanyId = true;

}

return success;

}

bool BLEAdvertisingData::setAdvertisedServiceData(uint16_t uuid, const uint8_t data[], int length)

{

int previousLength = (_serviceDataLength > 0) ? (_serviceDataLength + sizeof(uuid) + AD_FIELD_OVERHEAD) : 0;

bool success = updateRemainingLength(previousLength, (length + sizeof(uuid) + AD_FIELD_OVERHEAD));

if (success) {

_serviceDataUuid = uuid;

_serviceData = data;

_serviceDataLength = length;

}

return success;

}

bool BLEAdvertisingData::setLocalName(const char *localName)

{

int previousLength = (_localName && strlen(_localName) > 0) ? (strlen(_localName) + AD_FIELD_OVERHEAD) : 0;

bool success = updateRemainingLength(previousLength, (strlen(localName) + AD_FIELD_OVERHEAD));

if (success) {

_localName = localName;

}

return success;

}

bool BLEAdvertisingData::setRawData(const uint8_t* data, int length)

{

if (length > MAX_AD_DATA_LENGTH) {

return false;

}

_rawData = data;

_rawDataLength = length;

return true;

}

bool BLEAdvertisingData::setRawData(const BLEAdvertisingRawData& rawData)

{

if (rawData.length > MAX_AD_DATA_LENGTH) {

return false;

}

_rawData = rawData.data;

_rawDataLength = rawData.length;

return true;

}

bool BLEAdvertisingData::setFlags(uint8_t flags)

{

int previousLength = (_hasFlags) ? (sizeof(_flags) + AD_FIELD_OVERHEAD) : 0;

bool success = updateRemainingLength(previousLength, (sizeof(flags) + AD_FIELD_OVERHEAD));

if (success) {

_hasFlags = true;

_flags = flags;

}

return success;

}

bool BLEAdvertisingData::updateData()

{

// Success indicates whether all the fields have been inserted

bool success = true;

// Reset data

_dataLength = 0;

// If rawData is present, then only rawData is inserted in the advertising packet

if (_rawData && _rawDataLength) {

return addRawData(_rawData, _rawDataLength);

}

// Try to add flags into the current advertising packet

if (_hasFlags) {

success &= addFlags(_flags);

}

// Try to add Advertised service uuid into the current advertising packet

if (_advertisedServiceUuid) {

success &= addAdvertisedServiceUuid(_advertisedServiceUuid);

}

// Try to add Manufacturer data into the current advertising packet

if (_manufacturerData && _manufacturerDataLength) {

if (_hasManufacturerCompanyId) {

success &= addManufacturerData(_manufacturerCompanyId, _manufacturerData, _manufacturerDataLength);

} else {

success &= addManufacturerData(_manufacturerData, _manufacturerDataLength);

}

// Try to add Service data into the current advertising packet

if (_serviceData && _serviceDataLength) {

success &= addAdvertisedServiceData(_serviceDataUuid, _serviceData, _serviceDataLength);

}

// Try to add Local name into the current advertising packet

if (_localName) {

success &= addLocalName(_localName);

}

return success;

}

uint8_t* BLEAdvertisingData::data()

{

return _data;

}

int BLEAdvertisingData::dataLength() const

{

return _dataLength;

}

bool BLEAdvertisingData::hasFlags() const

{

return _hasFlags;

}

bool BLEAdvertisingData::addLocalName(const char *localName)

{

bool success = false;

if (strlen(localName) > (MAX_AD_DATA_LENGTH - AD_FIELD_OVERHEAD)) {

success = addField(BLEFieldShortLocalName, (uint8_t*)localName, (MAX_AD_DATA_LENGTH - AD_FIELD_OVERHEAD));

} else {

success = addField(BLEFieldCompleteLocalName, localName);

}

return success;

}

bool BLEAdvertisingData::addAdvertisedServiceUuid(const char* advertisedServiceUuid)

{

BLEUuid uuid(advertisedServiceUuid);

int uuidLen = uuid.length();

BLEAdField advField;

if (uuidLen > 2) {

advField = BLEFieldIncompleteAdvertisedService128;

} else {

advField = BLEFieldIncompleteAdvertisedService16;

}

return addField(advField, uuid.data(), uuidLen);

}

bool BLEAdvertisingData::addManufacturerData(const uint8_t manufacturerData[], int manufacturerDataLength)

{

return addField(BLEFieldManufacturerData, manufacturerData, manufacturerDataLength);

}

bool BLEAdvertisingData::addManufacturerData(const uint16_t companyId, const uint8_t manufacturerData[], int manufacturerDataLength)

{

int tempDataLength = manufacturerDataLength + sizeof(companyId);

uint8_t tempData[MAX_AD_DATA_LENGTH];

memcpy(tempData, &companyId, sizeof(companyId));

memcpy(&tempData[sizeof(companyId)], manufacturerData, manufacturerDataLength);

return addField(BLEFieldManufacturerData, tempData, tempDataLength);

}

bool BLEAdvertisingData::addAdvertisedServiceData(uint16_t uuid, const uint8_t data[], int length)

{

int tempDataLength = length + sizeof(uuid);

uint8_t tempData[MAX_AD_DATA_LENGTH];

memcpy(tempData, &uuid, sizeof(uuid));

memcpy(&tempData[sizeof(uuid)], data, length);

return addField(BLEFieldServiceData, tempData, tempDataLength);

}

bool BLEAdvertisingData::addRawData(const uint8_t* data, int length)

{

// Bypass addField to add the integral raw data

if (length > (MAX_AD_DATA_LENGTH - _dataLength)) {

// Not enough space

return false;

}

memcpy(&_data[_dataLength], data, length);

_dataLength += length;

return true;

}

bool BLEAdvertisingData::addFlags(uint8_t flags)

{

return addField(BLEFieldFlags, &flags, sizeof(flags));

}

bool BLEAdvertisingData::addField(BLEAdField field, const char* data)

{

int dataLength = strlen(data);

return addField(field, (uint8_t *)data, dataLength);

}

bool BLEAdvertisingData::addField(BLEAdField field, const uint8_t* data, int length)

{

int fieldLength = length + AD_FIELD_OVERHEAD; // Considering data TYPE and LENGTH fields

if (fieldLength > (MAX_AD_DATA_LENGTH - _dataLength)) {

// Not enough space for storing this field

return false;

}

// Insert field into advertising data of the instance

_data[_dataLength++] = length + 1;

_data[_dataLength++] = field;

memcpy(&_data[_dataLength], data, length);

_dataLength += length;

return true;

}

STM32duinoBLE/src/BLEAdvertisingData.cpp at main · stm32duino/STM32duinoBLE · GitHub

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