2.4.0

Fixed

• GATT attribute handles are now assigned from the registration callback so duplicate UUID attributes are identified correctly.
• Dynamic service changes now properly remove characteristics/descriptors and reset the GATT database when advertising starts.
• Missing notification/indication payload data when the value spans multiple mbufs, such as values larger than 255 bytes with small ACL buffers.
• NimBLEDevice::createServer will longer crash when called before the stack is initialized.
• Re-pairing after deleting all bonds now works by unpairing each stored bond instead of only deleting NVS data.
• Whitelist bounds checks.
• NimBLEDevice::getBondedAddress index bounds validation.
• ESP32 linker error when both central and peripheral roles are disabled.
• Compiler warnings when bonds are disabled.

Added

• NimBLEStream, NimBLEStreamClient, and NimBLEStreamServer classes and examples.
• NimBLECppVersion.h with compile-time version macros.
• NimBLEDevice::getVersion runtime version string helper.
• Matching passkey callbacks for both roles: NimBLEServerCallbacks::onPassKeyEntry and NimBLEClientCallbacks::onPassKeyDisplay.
• Bond migration helpers to convert bond storage between v1 and current formats while preserving existing bonds.
• NimBLEUUID constructor overload for ble_uuid_t*.
• Optional index parameter for NimBLECharacteristic::getDescriptorByUUID to access multiple descriptors with the same UUID.

Changed

• NimBLEService::start is deprecated; services are now added when the server starts.
• NimBLEHIDDevice::startServices() is deprecated; services are now added when the server starts.