esp-nimble-cpp/CHANGELOG.md

Changelog

All notable changes to this project will be documented in this file.

[2.3.2] 2025-09-02

Fixed

• Build failures with esp-idf versions 4.x.
• Workaround for upstream issue causing onConnectFail to not be called.
• Build failures with idf v5.5+ and specific roles are not enabled.

Changed

• Allow peripheral and central roles to be used without broadcaster/observer roles.
• Where applicable, MYNEWT_VAL_ macros are used to control feature availability instead of CONFIG_

[2.3.1] 2025-06-11

Fixed

• Build errors when disabling BLE roles.
• NimBLEClient::readValue call not returning when the instance was created with aNimBLEServer and reading a secured characteristic.
• NimBLEScan destructor potentially causing a crash.

Added

• NimBLEBeacon::BeaconData std::vector<uint8_t> operator to allow it to be used as a parameter to NimBLEAdvertisementData::setManufacturerData.

[2.3.0] 2025-05-19

Fixed

• Incorrect NimBLECharacteristic::onSubscribe value when indications are set.
• NimBLECharacteristic::onRead callback not called in some cases.
• Clear attribute value when zero length value is written.
• Notify/Indicate incorrectly returning success with custom value.
• Corrected NimBLEClient array initialization.
• Prevent potential exception when scan is restarted.
• Attribute getValue failing with some data types
• Incorrectly passing a pointer to a function taking const reference.

Added

• Support for esp32c5
• L2CAP infrastructure.
• Scan duplicate cache reset time.

Changed

• Cleaned up examples.
• Allow PHY updates without enabling extended advertising.

[2.2.1] 2025-02-28

Fixed

• Added back NimBLEClient::connect overload with NimBLEAdvertisedDevice parameter to resolve connection error due to NULL address.
• Crash caused by returning invalid vector entry when retrieving remote descriptors.

[2.2.0] 2025-02-24

Fixed

• Crash when calling NimBLEClient::DiscoverAttributes.

Added

• Conditional macros for logging.
• NimBLEDeviceCallbacks class with a callback for handling bond storage.

[2.1.1] 2025-01-26

Fixed

• remote descriptor discovery error when no descriptors exist.
• scan filter settings not enabled for esp32s3/c3.
• remote descriptor discovery returning more than the desired descriptor.

[2.1.0] 2025-01-12

Fixed

• Crash when retrieving descriptors if more than one exists.
• Incorrect TX power value being advertised.
• New user guide code for 2.x
• Potential race condition if `NimBLEScan::clearResults1 is called from multiple tasks.

Changed

• If privacy is not enabled identity keys will not be shared.
• NimBLEDevice::setPower and NimBLEDevice::getPower now take an additional parameter NimBLETxPowerType to set/get the power level for different operations.

Added

• Config option CONFIG_NIMBLE_CPP_ADDR_FMT_EXCLUDE_DELIMITER, if defined will remove the ":" delimiter from the BLE address string.
• Config option CONFIG_NIMBLE_CPP_ADDR_FMT_UPPERCASE if defined will make the BLE address strings uppercase.

[2.0.3] 2025-01-05

Fixed

• Unused variable warning when log level is below info.
• Build error missing definition of CONFIG_NIMBLE_CPP_FREERTOS_TASK_BLOCK_BIT in platformio.
• Race condition in NimBLEScan that can cause a crash due to heap corruption if NimBLEScan::stop is called from the onResult callback.
• Advertisement data not set if scan response is enabled after the data is set.
• NimBLECharacteristic/NimBLEDescriptor not able to update their values in the onRead callback.
• Too short of a timeout being requested in NimBLE_Server example leading to frequent disconnects.

Changed

• NimBLEHIDDevice now allows for the same report ID in multiple input/output/feature reports.

Added

• Config for custom log colors pre level.
• Error logs in the case that NIMBLE_CPP_DEBUG_ASSERT is not defined.
• Error logs when setting advertisement data fails.
• Missing documentation in the migration guide about enabling automatic advertising on disconnect, which was disabled by default in 2.x.

[2.0.2] 2024-12-21

Fixed

• Compile error when only advertising role is enabled.
• Possible crash if bonded client reconnects.

Changed

• NimBLEHIDDevice can now create more than one in/out/feature report map.

[2.0.1] 2024-12-16

Fixed

• NimBLEHIDDevice::getOutputReport will now return the correct characteristic.
• Compile error when central is disabled, class NimBLEServer has no member named m_pClient.

Changed

• Added missing includes for NimBLEConnInfo and NimBLEUtils to NimBLEDevice.h.

[2.0.0] 2024-12-14

Breaking changes

• All connection oriented callbacks now receive a reference to NimBLEConnInfo, the ble_gap_conn_desc has also been replace with NimBLEConnInfo in the functions that received it.
• All functions that take a time input parameter now expect the value to be in milliseconds instead of seconds.
• Removed Eddystone URL as it has been shutdown by google since 2021.
• NimBLESecurity class removed.
• NimBLEDevice Ignore list functions removed.
• NimBLEDevice::startSecurity now returns a bool, true on success, instead of an int to be consistent with the rest of the library.
• NimBLEDevice::getInitialized renamed to NimBLEDevice::isInitialized.
• NimBLEDevice::setPower no longer takes the esp_power_level_t and esp_ble_power_type_t, instead only an integer value in dbm units is accepted.
• NimBLEDevice::setOwnAddrType no longer takes a bool nrpa parameter.
• NimBLEDevice::getClientListSize replaced with NimBLEDevice::getCreatedClientCount.
• NimBLEDevice::getClientList was removed.
• NimBLEServer::disconnect now returns bool, true = success, instead of int to be consistent with the rest of the library.
• NimBLEServerCallbacks::onMTUChanged renamed to NimBLEServerCallbacks::onMTUChange to be consistent with the client callback.
• NimBLEServer::getPeerIDInfo renamed to NimBLEServer::getPeerInfoByHandle to better describe it's use.
• NimBLEServerCallbacks::onPassKeyRequest has been replaced with NimBLEServer::onPassKeyDisplay which should display the pairing pin that the client is expected to send.
• NimBLEServerCallbacks::onAuthenticationComplete now takes a NimBLEConnInfo& parameter.
• NimBLEClient::getServices now returns a const reference to std::vector<NimBLERemoteService*> instead of a pointer to the internal vector.
• NimBLEClient::getConnId has been renamed to getConnHandle to be consistent with bluetooth terminology.
• NimBLEClient::disconnect now returns a bool, true on success, instead of an int to be consistent with the rest of the library.
• NimBLEClientCallbacks::onDisconnect now takes an additional int reason parameter to let the application know why the disconnect occurred.
• NimBLEClientCallbacks::onPassKeyRequest has been changed to NimBLEClientCallbacks::onPassKeyEntry which takes a NimBLEConnInfo& parameter and does not return a value. Instead or returning a value this callback should prompt a user to enter a pin number which is sent later via NimBLEDevice::injectPassKey.
• NimBLEClientCallbacks::onConfirmPIN renamed to NimBLEClientCallbacks::onConfirmPasskey and no longer returns a value and now takes a NimBLEConnInfo& parameter. This should be used to prompt a user to confirm the pin on the display (YES/NO) after which the response should be sent with NimBLEDevice::injectConfirmPasskey.
• NimBLEAdvertising::setMinPreferred and NimBLEAdvertising::setMaxPreferred have been removed, use NimBLEAdvertising::setPreferredParams instead.
• Advertising the name and TX power of the device will no longer happen by default and should be set manually by the application.
• NimBLEAdvertising::setAdvertisementType has been renamed to NimBLEAdvertising::setConnectableMode to better reflect it's function.
• NimBLEAdvertising::setScanResponse has been renamed to NimBLEAdvertising::enableScanResponse to better reflect it's function.
• NimBLEAdvertising; Scan response is no longer enabled by default.
• NimBLEAdvertising::start No longer takes a callback pointer parameter, instead the new method NimBLEAdvertising::setAdvertisingCompleteCallback should be used.
• NimBLEAdvertisementData::addData now takes either a std::vector<uint8_t> or uint8_t* + length instead of std::string or char + length.
• NimBLEAdvertisementData::getPayload now returns std::vector<uint8_t> instead of std::string.
• The callback parameter for NimBLEScan::start has been removed and the blocking overload of NimBLEScan::start has been replaced by an overload of NimBLEScan::getResults with the same parameters.
• NimBLEAdvertisedDeviceCallbacks Has been replaced by NimBLEScanCallbacks which contains the following methods: onResult, onScanEnd, and `onDiscovered
• • NimBLEScanCallbacks::onResult, functions the same as the old NimBLEAdvertisedDeviceCallbacks::onResult but now takes aa const NimBLEAdvertisedDevice* instead of non-const.
• • NimBLEScanCallbacks::onScanEnd, replaces the scanEnded callback passed to NimBLEScan::start and now takes a const NimBLEScanResults& and int reason parameter.
• • NimBLEScanCallbacks::onDiscovered, This is called immediately when a device is first scanned, before any scan response data is available and takes a const NimBLEAdvertisedDevice* parameter.
• NimBLEScan::stop will no longer call the onScanEnd callback as the caller should know its been stopped when this is called.
• NimBLEScan::clearDuplicateCache has been removed as it was problematic and only for the esp32. Stop and start the scanner for the same effect.
• NimBLEScanResults::getDevice methods now return const NimBLEAdvertisedDevice*.
• NimBLEScanResults iterators are now const_iterator.
• NimBLEAdvertisedDevice::hasRSSI removed as redundant, RSSI is always available.
• NimBLEAdvertisedDevice::getPayload now returns const std::vector<uint8_t> instead of a pointer to internal memory.
• NimBLEAdvertisedDevice Timestamp removed, if needed then the app should track the time from the callback.
• NimBLECharacteristic::notify no longer takes a bool is_notification parameter, instead indicate() should be called to send indications.
• NimBLECharacteristicCallbacks::onNotify removed as unnecessary, the library does not call notify without app input.
• NimBLECharacteristicCallbacks::onStatus No longer takes a status parameter, refer to the return code for success/failure.
• NimBLERemoteCharacteristic::getRemoteService now returns a const NimBLERemoteService* instead of non-const.
• NimBLERemoteCharacteristic::readUInt32 Has been removed.
• NimBLERemoteCharacteristic::readUInt16 Has been removed.
• NimBLERemoteCharacteristic::readUInt8 Has been removed.
• NimBLERemoteCharacteristic::readFloat Has been removed.
• NimBLERemoteCharacteristic::registerForNotify Has been removed.
• NimBLERemoteService::getCharacteristics now returns a const std::vector<NimBLERemoteCharacteristic*>& instead of non-const std::vector<NimBLERemoteCharacteristic*>*.
• NimBLERemoteService::getValue now returns NimBLEAttValue instead of std::string.
• NimBLEService::getCharacteristics now returns a const std::vector<NimBLECharacteristic*>& instead of std::vector<NimBLECharacteristic *>.
• NimBLEUUID::getNative method replaced with NimBLEUUID::getBase which returns a read-only pointer to the underlying ble_uuid_t struct.
• NimBLEUUID; msbFirst parameter has been removed from constructor, caller should reverse the data first or call the new reverseByteOrder method after.
• NimBLEAddress constructor; default value for the type parameter removed, caller should know the address type and specify it.
• NimBLEAddress::getNative replaced with NimBLEAddress::getBase and now returns a pointer to const ble_addr_t instead of a pointer to the address value.
• NimBLEAddress::equals method and NimBLEAddress::== operator will now also test if the address types are the same.
• NimBLEUtils::dumpGapEvent function removed.
• NimBLEUtils::buildHexData replaced with NimBLEUtils::dataToHexString, which returns a std::string containing the hex string.
• NimBLEEddystoneTLM::setTemp now takes an int16_t parameter instead of float to be friendly to devices without floating point support.
• NimBLEEddystoneTLM::getTemp now returns int16_t to work with devices that don't have floating point support.
• NimBLEEddystoneTLM::setData now takes a reference to * NimBLEEddystoneTLM::BeaconData instead of std::string.
• NimBLEEddystoneTLM::getData now returns a reference to * NimBLEEddystoneTLM::BeaconData instead of std::string.
• NimBLEBeacon::setData now takes const NimBLEBeacon::BeaconData& instead of std::string.
• NimBLEBeacon::getData now returns const NimBLEBeacon::BeaconData& instead of std::string.
• NimBLEHIDDevice::reportMap renamed to NimBLEHIDDevice::getReportMap.
• NimBLEHIDDevice::hidControl renamed to NimBLEHIDDevice::getHidControl.
• NimBLEHIDDevice::inputReportrenamed to NimBLEHIDDevice::getInputReport.
• NimBLEHIDDevice::outputReportrenamed to NimBLEHIDDevice::getOutputReport.
• NimBLEHIDDevice::featureReportrenamed to NimBLEHIDDevice::getFeatureReport.
• NimBLEHIDDevice::protocolModerenamed to NimBLEHIDDevice::getProtocolMode.
• NimBLEHIDDevice::bootOutputrenamed to NimBLEHIDDevice::getBootOutput.
• NimBLEHIDDevice::pnprenamed to NimBLEHIDDevice::setPnp.
• NimBLEHIDDevice::hidInforenamed to NimBLEHIDDevice::setHidInfo.
• NimBLEHIDDevice::deviceInforenamed to NimBLEHIDDevice::getDeviceInfoService.
• NimBLEHIDDevice::hidServicerenamed to NimBLEHIDDevice::getHidService.
• NimBLEHIDDevice::batteryServicerenamed to NimBLEHIDDevice::getBatteryService.

Fixed

• NimBLEDevice::getPower and NimBLEDevice::getPowerLevel bug worked around for the esp32s3 and esp32c3.
• NimBLEDevice::setPower and NimBLEDevice::getPower now support the full power range for all esp devices.
• NimBLEDevice::setOwnAddrType will now correctly apply the provided address type for all devices.
• NimBLEDevice::getPower (esp32) return value is now calculated to support devices with different min/max ranges.
• Crash if NimBLEDevice::deinit is called when the stack has not been initialized.
• NimBLEServer service changed notifications will now wait until the changes have taken effect and the server re-started before indicating the change to peers, reducing difficultly for some clients to update their data.
• NimBLEService::getHandle will now fetch the handle from the stack if not valid to avoid returning an invalid value.
• std::vector input to set/write values template.
• NimBLEHIDDevice::pnp will now set the data correctly.
• Check for Arduino component
• Fixed building with esp-idf version 5.x.
• Fixed pairing failing when the process was started by the peer first.
• Fixed building with esp-idf and Arduino component.
• Workaround for esp32s3 and esp32c3 not returning the correct txPower with some IDF versions.

Changed

• NimBLEClient::secureConnection now takes an additional parameter bool async, if true, will send the secure command and return immediately with a true value for successfully sending the command, else false. This allows for asynchronously securing a connection.
• Deleting the client instance from the onDisconnect callback is now supported.
• NimBLEClient::connect will no longer cancel already in progress connections.
• NimBLEClient::setDataLen now returns bool, true if successful.
• NimBLEClient::updateConnParams now returns bool, true if successful.
• NimBLEClient::setPeerAddress now returns a bool, true on success.
• NimBLEDevice::startSecurity now takes and additional parameter int* rcPtr which will provide the return code from the stack if provided.
• NimBLEDevice::deleteClient no longer blocks tasks.
• NimBLEDevice::getAddress will now return the address currently in use.
• NimBLEDevice::init now returns a bool with true indicating success.
• NimBLEDevice::deinit now returns a bool with true indicating success.
• NimBLEDevice::setDeviceName now returns a bool with true indicating success.
• NimBLEDevice::setCustomGapHandler now returns a bool with true indicating success.
• NimBLEDevice::setOwnAddrType now returns a bool with true indicating success and works with non-esp32 devices.
• NimBLEDevice::setPower now returns a bool value, true = success.
• NimBLEDevice::setMTU now returns a bool value, true = success.
• NimBLEDevice::deleteAllBonds now returns true on success, otherwise false.
• NimBLEEddystoneTLM internal data struct type BeaconData is now public and usable by the application.
• NimBLEBeacon internal data struct type BeaconData is now public and can be used by the application.
• Removed tracking of client characteristic subscription status from NimBLEServer and NimBLECharacteristic and instead uses the functions and tracking in the host stack.
• NimBLECharacteristic::indicate now takes the same parameters as notify.
• NimBLECharacteristic::notify and NimBLECharacteristic::indicate now return a bool, true = success.
• Added optional connHandle parameter to NimBLECharacteristic::notify to allow for sending notifications to specific clients.
• NimBLEServer Now uses a std::array to store client connection handles instead of std::vector to reduce memory allocation.
• NimBLEExtAdvertisement : All functions that set data now return bool, true = success.
• NimBLEAdvertising Advertising data is now stored in instances of NimBLEAdvertisingData and old vectors removed.
• NimBLEAdvertising::setAdvertisementData and NimBLEAdvertising::setScanResponseData now return bool, true = success.
• Added optional NimBLEAddress parameter to NimBLEAdvertising::start to allow for directed advertising to a peer.
• All NimBLEAdvertising functions that change data values now return bool, true = success.
• All NimBLEAdvertisementData functions that change data values now return bool, true = success.
• NimBLEAdvertising advertising complete callback is now defined as std::function to allow for using std::bind for callback functions.
• NimBLEAdvertisementData::setName now takes an optional bool parameter to indicate if the name is complete or incomplete, default = complete.
• NimBLEAdvertisementData moved to it's own .h and .cpp files.
• NimBLEScan::start takes a new bool restart parameter, default true, that will restart an already in progress scan and clear the duplicate filter so all devices will be discovered again.
• Scan response data that is received without advertisement first will now create the device and send a callback.
• NimBLEScan::start will no longer clear cache or results if scanning is already in progress.
• NimBLEScan::start will now allow the start command to be sent with updated parameters if already scanning.
• NimBLEScan::clearResults will now reset the vector capacity to 0.
• Host reset will now no longer restart scanning and instead will call NimBLEScanCallbacks::onScanEnd.
• Added optional index parameter to NimBLEAdvertisedDevice::getPayloadByType
• NimBLEAdvertisedDevice::getManufacturerData now takes an optional index parameter for use in the case of multiple manufacturer data fields.
• NimBLEUtils: Add missing GAP event strings.
• NimBLEUtils: Add missing return code strings.
• NimBLEUtils: Event/error code strings optimized.
• NimBLEAttValue cleanup and optimization.
• cleaned up code, removed assert/abort calls, replaced with a configurable option to enable debug asserts.

Added

• (esp32 specific) NimBLEDevice::setPowerLevel and NimBLEDevice::getPowerLevel which take and return the related esp_power_level* types.
• NimBLEDevice::setDefaultPhy which will set the default preferred PHY for all connections.
• NimBLEDevice::getConnectedClients, which returns a vector of pointers to the currently connected client instances.
• NimBLEDevice::setOwnAddr function added, which takes a uint8_t* or NimBLEAddress& and will set the mac address of the device, returns bool true= success.
• NimBLEDevice::injectPassKey Used to send the pairing passkey instead of a return value from the client callback.
• NimBLEDevice::injectConfirmPasskey Used to send the numeric comparison pairing passkey confirmation instead of a return value from the client callback.
• NimBLEDevice::setDeviceName to change the device name after initialization.
• NimBLECharacteristic::create2904 which will specifically create a Characteristic Presentation Format (0x2904) descriptor.
• NimBLEAdvertising::refreshAdvertisingData refreshes the advertisement data while still actively advertising.
• NimBLEClient::updatePhy to request a PHY change with a peer.
• NimBLEClient::getPhy to read the current connection PHY setting.
• Config struct to NimBLEClient to efficiently set single bit config settings.
• NimBLEClient::setSelfDelete that takes the bool parameters deleteOnDisconnect and deleteOnConnectFail, which will configure the client to delete itself when disconnected or the connection attempt fails.
• NimBLEClient::setConfig and NimBLEClient::getConfig which takes or returns a NimBLEClient::Config object respectively.
• NimBLEClient::cancelConnect() to cancel an in-progress connection, returns bool, true = success.
• Non-blocking NimBLEClient::connect option added via 2 new bool parameters added to the function:
• • asyncConnect; if true, will send the connect command and return immediately.
• • exchangeMTU; if true will send the exchange MTU command upon connection.
• NimBLEClientCallbacks::onConnectFail callback that is called when the connection attempt fail while connecting asynchronously.
• NimBLEClientCallbacks::onMTUChange callback which will be called when the MTU exchange completes and takes a NimBLEClient* and uint16_t MTU parameter.
• NimBLEClientCallbacks::onPhyUpdate and -NimBLEServerCallbacks::onPhyUpdate Which are called when the PHY update is complete.
• Extended scan example.
• NimBLEServer::updatePhy to request a PHY change with a peer.
• NimBLEServer::getPhy to read the PHY of a peer connection.
• NimBLEServer::getClient which will create a client instance from the provided peer connHandle or connInfo to facilitate reading/write from the connected client.
• NimBLEServerCallbacks::onConnParamsUpdate callback.
• NimBLEScan::erase overload that takes a const NimBLEAdvertisedDevice* parameter.
• NimBLEScan::setScanPhy to enable/disable the PHY's to scan on (extended advertising only).
• NimBLEScan::setScanPeriod which will allow for setting a scan restart timer in the controller (extended advertising only).
• NimBLEAdvertisedDevice::isScannable() that returns true if the device is scannable.
• NimBLEAdvertisedDevice::begin and NimBLEAdvertisedDevice::end read-only iterators for convenience and use in range loops.
• NimBLEAdvertisedDevice::getAdvFlags returns the advertisement flags of the advertiser.
• NimBLEAdvertisedDevice::getPayloadByType Generic use function that returns the data from the advertisement with the specified type.
• NimBLEAdvertisedDevice::haveType Generic use function that returns true if the advertisement data contains a field with the specified type.
• Support for esp32c6, esp32c2, esp32h2, and esp32p4.
• NimBLEExtAdvertisement::removeData, which will remove the data of the specified type from the advertisement.
• NimBLEExtAdvertisement::addServiceUUID, which will append to the service uuids advertised.
• NimBLEExtAdvertisement::removeServiceUUID, which will remove the service from the uuids advertised.
• NimBLEExtAdvertisement::removeServices, which will remove all service uuids advertised.
• New overloads for NimBLEExtAdvertisement::setServiceData with the parameters const NimBLEUUID& uuid, const uint8_t* data, size_t length and const NimBLEUUID& uuid, const std::vector<uint8_t>& data.
• NimBLEExtAdvertisement::getDataLocation, which returns the location in the advertisement data of the type requested in parameter uint8_t type.
• NimBLEExtAdvertisement::toString which returns a hex string representation of the advertisement data.
• NimBLEAdvertising::getAdvertisementData, which returns a reference to the currently set advertisement data.
• NimBLEAdvertising::getScanData, which returns a reference to the currently set scan response data.
• New overloads for NimBLEAdvertising::removeServiceUUID and NimBLEAdvertisementData::removeServiceUUID to accept a const char*
• NimBLEAdvertising::clearData, which will clear the advertisement and scan response data.
• NimBLEAdvertising::setManufacturerData Overload that takes a const uint8_t* and , size_t` parameter.
• NimBLEAdvertising::setServiceData Overload that takes const NimBLEUUID& uuid, const uint8_t* data, size_t length as parameters.
• NimBLEAdvertising::setServiceData Overload that takes const NimBLEUUID& uuid, const std::vector<uint8_t>& as parameters.
• NimBLEAdvertising::setDiscoverableMode to allow applications to control the discoverability of the advertiser.
• NimBLEAdvertising::setAdvertisingCompleteCallback sets the callback to call when advertising ends.
• NimBLEAdvertising::setPreferredParams that takes the min and max preferred connection parameters as an alternative for setMinPreferred and setMaxPreferred.
• NimBLEAdvertising::setAdvertisingInterval Sets the advertisement interval for min and max to the same value instead of calling setMinInterval and setMaxInterval separately if there is not value difference.
• NimBLEAdvertisementData::removeData, which takes a parameter uint8_t type, the data type to remove.
• NimBLEAdvertisementData::toString, which will print the data in hex.
• NimBLEUtils::taskWait which causes the calling task to wait for an event.
• NimBLEUtils::taskRelease releases the task from and event.
• NimBLEUtils::generateAddr function added with will generate a random address and takes a bool parameter, true = create non-resolvable private address, otherwise a random static address is created, returns NimBLEAddress.
• NimBLEUUID::getValue which returns a read-only uint8_t pointer to the UUID value.
• NimBLEUUID::reverseByteOrder, this will reverse the bytes of the UUID, which can be useful for advertising/logging.
• NimBLEUUID constructor overload that takes a reference to ble_uuid_any_t.
• NimBLEAddress::isNrpa method to test if an address is random non-resolvable.
• NimBLEAddress::isStatic method to test if an address is random static.
• NimBLEAddress::isPublic method to test if an address is a public address.
• NimBLEAddress::isNull methods to test if an address is NULL.
• NimBLEAddress::getValue method which returns a read-only pointer to the address value.
• NimBLEAddress::reverseByteOrder method which will reverse the byte order of the address value.
• NimBLEHIDDevice::batteryLevel returns the HID device battery level characteristic.
• NimBLEBeacon::setData overload that takes uint8_t* data and uint8_t length.
• NimBLEHIDDevice::getPnp function added to access the pnp characteristic.
• NimBLEHIDDevice::getHidInfo function added to access the hid info characteristic.

[1.4.1] - 2022-10-30

Fixed

• NimBLEDevice::getPower incorrect value when power level is -3db.
• Failed pairing when already in progress.

Changed

• Revert previous change that forced writing with response when subscribing in favor of allowing the application to decide.

Added

• Added NimBLEHIDDevice::batteryLevel.
• Added NimBLEDevice::setDeviceName allowing for changing the device name while the BLE stack is active.
• CI Builds

[1.4.0] - 2022-07-31

Fixed

• Fixed missing data from long notification values.
• Fixed NimbleCharacteristicCallbacks::onRead not being called when a non-long read command is received.
• Prevent a potential crash when retrieving characteristics from a service if the result was successful but no characteristics found.
• logs/typos.

Changed

• AD flags are no longer set in the advertisements of non-connectable beacons, freeing up 3 bytes of advertisement room.
• Save resources when retrieving descriptors if the characteristic handle is the same as the end handle (no descriptors).
• Subscribing to characteristic notifications/indications will now always use write with response, as per BLE specifications.
• NimBLEClient::discoverAttributes now returns a bool value to indicate success/failure.
• Scan result callbacks are no longer called when the scan response data is updated in order to reduce duplicates.

Added

• Preliminary support for non-esp devices, NRF51 and NRF52 devices supported with n-able arduino core
• Alias added for NimBLEServerCallbacks::onMTUChange to onMtuChanged in order to support porting code from original library.
• NimBLEAttValue Class added to reduce and control RAM footprint of characteristic/descriptor values and support conversions from Arduino Strings and many other data types.
• Bluetooth 5 extended advertising support for capable devices. CODED Phy, 2M Phy, extended advertising data, and multi-advertising are supported, periodic advertising will be implemented in the future.

[1.3.3] - 2022-02-15

Changed

• If attribute retrieval fails with a "not found" try again with the 16 bit version if a 128 bit base uuid is used.

Fixed

• Memory leak when deleting client instance.
• IDf version check for data length extension.
• Memory leak when server services changed.
• Compiler warnings for non-esp32 devices.

[1.3.2] - 2022-01-15

Fixed

• Initialize advertising complete callback in NimBLEAdvertising constructor.
• Clear client disconnect timer in constructor before initializing.
• Fix missing data when reading large values.
• Fix missing data in notifications when using a large MTU size and more than 270 bytes of data are sent.
• Workaround fix added for cases when the task notification value is not cleared, causing various functions that should block not to block.

Added

• NimBLEClient::getLastError : Gets the error code of the last function call that produces a return code from the stack.
• NimBLECharacteristic::notify : Overload method to send notifications/indications with custom values.
• Added conditional checks for ESP32 specific functions/values to support use of the library on non-esp32 devices.
• Added an alias to use the callback name from the original library onMtuChanged.
• NimBLEClient::setDataLen and NimBLEServer::setDataLen: Data length extension support (IDF version >= 4.3.2 only)
• Config option to set logging level for esp-nimble-cpp

Changed

• Critical section calls now use the NimBLE API instead of FreeRTOS directly. This removes the need for a portMUX_TYPE variable in the class definitions.
• Removed unnecessary variables in NimBLEService and changed the constructor no no longer accept numHandles and inst_id parameters.

[1.3.1] - 2021-08-04

Fixed

• Corrected a compiler/linker error when an application or a library uses bluetooth classic due to the redefinition of btInUse.

[1.3.0] - 2021-08-02

Added

• NimBLECharacteristic::removeDescriptor: Dynamically remove a descriptor from a characteristic. Takes effect after all connections are closed and sends a service changed indication.

• NimBLEService::removeCharacteristic: Dynamically remove a characteristic from a service. Takes effect after all connections are closed and sends a service changed indication

• NimBLEServerCallbacks::onMTUChange: This is callback is called when the MTU is updated after connection with a client.

• ESP32C3 support

• Whitelist API:

  • NimBLEDevice::whiteListAdd: Add a device to the whitelist.
  • NimBLEDevice::whiteListRemove: Remove a device from the whitelist.
  • NimBLEDevice::onWhiteList: Check if the device is on the whitelist.
  • NimBLEDevice::getWhiteListCount: Gets the size of the whitelist
  • NimBLEDevice::getWhiteListAddress: Get the address of a device on the whitelist by index value.

• Bond management API:

  • NimBLEDevice::getNumBonds: Gets the number of bonds stored.
  • NimBLEDevice::isBonded: Checks if the device is bonded.
  • NimBLEDevice::deleteAllBonds: Deletes all bonds.
  • NimBLEDevice::getBondedAddress: Gets the address of a bonded device by the index value.

• NimBLECharacteristic::getCallbacks to retrieve the current callback handler.

• Connection Information class: NimBLEConnInfo.

• NimBLEScan::clearDuplicateCache: This can be used to reset the cache of advertised devices so they will be immediately discovered again.

Changed

• FreeRTOS files have been removed as they are not used by the library.
• Services, characteristics and descriptors can now be created statically and added after.
• Excess logging and some asserts removed.
• Use ESP_LOGx macros to enable using local log level filtering.

Fixed

• NimBLECharacteristicCallbacks::onSubscribe Is now called after the connection is added to the vector.
• Corrected bonding failure when reinitializing the BLE stack.
• Writing to a characteristic with a std::string value now correctly writes values with null characters.
• Retrieving remote descriptors now uses the characteristic end handle correctly.
• Missing data in long writes to remote descriptors.
• Hanging on task notification when sending an indication from the characteristic callback.
• BLE controller memory could be released when using Arduino as a component.
• Compile errors with NimBLE release 1.3.0.

[1.2.0] - 2021-02-08

Added

• NimBLECharacteristic::getDescriptorByHandle: Return the BLE Descriptor for the given handle.

• NimBLEDescriptor::getStringValue: Get the value of this descriptor as a string.

• NimBLEServer::getServiceByHandle: Get a service by its handle.

• NimBLEService::getCharacteristicByHandle: Get a pointer to the characteristic object with the specified handle.

• NimBLEService::getCharacteristics: Get the vector containing pointers to each characteristic associated with this service. Overloads to get a vector containing pointers to all the characteristics in a service with the UUID. (supports multiple same UUID's in a service)

  • NimBLEService::getCharacteristics(const char *uuid)
  • NimBLEService::getCharacteristics(const NimBLEUUID &uuid)

• NimBLEAdvertisementData New methods:

  • NimBLEAdvertisementData::addTxPower: Adds transmission power to the advertisement.
  • NimBLEAdvertisementData::setPreferredParams: Adds connection parameters to the advertisement.
  • NimBLEAdvertisementData::setURI: Adds URI data to the advertisement.

• NimBLEAdvertising New methods:

  • NimBLEAdvertising::setName: Set the name advertised.
  • NimBLEAdvertising::setManufacturerData: Adds manufacturer data to the advertisement.
  • NimBLEAdvertising::setURI: Adds URI data to the advertisement.
  • NimBLEAdvertising::setServiceData: Adds service data to the advertisement.
  • NimBLEAdvertising::addTxPower: Adds transmission power to the advertisement.
  • NimBLEAdvertising::reset: Stops the current advertising and resets the advertising data to the default values.

• NimBLEDevice::setScanFilterMode: Set the controller duplicate filter mode for filtering scanned devices.

• NimBLEDevice::setScanDuplicateCacheSize: Sets the number of advertisements filtered before the cache is reset.

• NimBLEScan::setMaxResults: This allows for setting a maximum number of advertised devices stored in the results vector.

• NimBLEAdvertisedDevice New data retrieval methods added:

  • haveAdvInterval/getAdvInterval: checks if the interval is advertised / gets the advertisement interval value.

  • haveConnParams/getMinInterval/getMaxInterval: checks if the parameters are advertised / get min value / get max value.

  • haveURI/getURI: checks if a URI is advertised / gets the URI data.

  • haveTargetAddress/getTargetAddressCount/getTargetAddress(index): checks if a target address is present / gets a count of the addresses targeted / gets the address of the target at index.

Changed

• nimconfig.h (Arduino) is now easier to use.

• NimBLEServer::getServiceByUUID Now takes an extra parameter of instanceID to support multiple services with the same UUID.

• NimBLEService::getCharacteristic Now takes an extra parameter of instanceID to support multiple characteristics with the same UUID.

• NimBLEAdvertising Transmission power is no longer advertised by default and can be added to the advertisement by calling NimBLEAdvertising::addTxPower

• NimBLEAdvertising Custom scan response data can now be used without custom advertisement.

• NimBLEScan Now uses the controller duplicate filter.

• NimBLEAdvertisedDevice Has been refactored to store the complete advertisement payload and no longer parses the data from each advertisement. Instead the data will be parsed on-demand when the user application asks for specific data.

Fixed

• NimBLEHIDDevice Characteristics now use encryption, this resolves an issue with communicating with devices requiring encryption for HID devices.

[1.1.0] - 2021-01-20

Added

• NimBLEDevice::setOwnAddrType added to enable the use of random and random-resolvable addresses, by asukiaaa

• New examples for securing and authenticating client/server connections, by mblasee.

• NimBLEAdvertising::SetMinPreferred and NimBLEAdvertising::SetMinPreferred re-added.

• Conditional checks added for command line config options in nimconfig.h to support custom configuration in platformio.

• NimBLEClient::setValue Now takes an extra bool parameter response to enable the use of write with response (default = false).

• NimBLEClient::getCharacteristic(uint16_t handle) Enabling the use of the characteristic handle to be used to find the NimBLERemoteCharacteristic object.

• NimBLEHIDDevice class added by wakwak-koba.

• NimBLEServerCallbacks::onDisconnect overloaded callback added to provide a ble_gap_conn_desc parameter for the application to obtain information about the disconnected client.

• Conditional checks in nimconfig.h for command line defined macros to support platformio config settings.

Changed

• NimBLEAdvertising::start now returns a bool value to indicate success/failure.

• Some asserts were removed in NimBLEAdvertising::start and replaced with better return code handling and logging.

• If a host reset event occurs, scanning and advertising will now only be restarted if their previous duration was indefinite.

• NimBLERemoteCharacteristic::subscribe and NimBLERemoteCharacteristic::registerForNotify will now set the callback regardless of the existence of the CCCD and return true unless the descriptor write operation failed.

• Advertising tx power level is now sent in the advertisement packet instead of scan response.

• NimBLEScan When the scan ends the scan stopped flag is now set before calling the scan complete callback (if used) this allows the starting of a new scan from the callback function.

Fixed

• Sometimes NimBLEClient::connect would hang on the task block if no event arrived to unblock. A time limit has been added to timeout appropriately.

• When getting descriptors for a characteristic the end handle of the service was used as a proxy for the characteristic end handle. This would be rejected by some devices and has been changed to use the next characteristic handle as the end when possible.

• An exception could occur when deleting a client instance if a notification arrived while the attribute vectors were being deleted. A flag has been added to prevent this.

• An exception could occur after a host reset event when the host re-synced if the tasks that were stopped during the event did not finish processing. A yield has been added after re-syncing to allow tasks to finish before proceeding.

• Occasionally the controller would fail to send a disconnected event causing the client to indicate it is connected and would be unable to reconnect. A timer has been added to reset the host/controller if it expires.

• Occasionally the call to start scanning would get stuck in a loop on BLE_HS_EBUSY, this loop has been removed.

• 16bit and 32bit UUID's in some cases were not discovered or compared correctly if the device advertised them as 16/32bit but resolved them to 128bits. Both are now checked.

• FreeRTOS compile errors resolved in latest Arduino core and IDF v3.3.

• Multiple instances of time() called inside critical sections caused sporadic crashes, these have been moved out of critical regions.

• Advertisement type now correctly set when using non-connectable (advertiser only) mode.

• Advertising payload length correction, now accounts for appearance.

• (Arduino) Ensure controller mode is set to BLE Only.

[1.0.2] - 2020-09-13

Changed

• NimBLEAdvertising::start Now takes 2 optional parameters, the first is the duration to advertise for (in seconds), the second is a callback that is invoked when advertising ends and takes a pointer to a NimBLEAdvertising object (similar to the NimBLEScan::start API).

• (Arduino) Maximum BLE connections can now be altered by only changing the value of CONFIG_BT_NIMBLE_MAX_CONNECTIONS in nimconfig.h. Any changes to the controller max connection settings in sdkconfig.h will now have no effect when using this library.

• (Arduino) Revert the previous change to fix the advertising start delay. Instead a replacement fix that routes all BLE controller commands from a task running on core 0 (same as the controller) has been implemented. This improves response times and reliability for all BLE functions.

[1.0.1] - 2020-09-02

Added

• Empty NimBLEAddress constructor: NimBLEAddress() produces an address of 00:00:00:00:00:00 type 0.
• Documentation of the difference of NimBLEAddress::getNative vs the original bluedroid library.

Changed

• notify_callback typedef is now defined as std::function to enable the use of std::bind to call a class member function.

Fixed

• Fix advertising start delay when first called.

[1.0.0] - 2020-08-22

First stable release.

All the original library functionality is complete and many extras added with full documentation.