The S140 SoftDevice is a Bluetooth® Low Energy Central and Peripheral protocol stack solution. The S140 SoftDevice supports running up to twenty connections concurrently, with an additional observer role and broadcaster role. The S140 SoftDevice integrates a Bluetooth Low Energy Controller and Host, and provides a full and flexible API for building Bluetooth Low Energy nRF52 System on Chip solutions.
S140 SoftDevice Specification
Key features
1.Bluetooth 5.1 compliant single-mode Bluetooth Low Energy protocol stack
-Concurrent central, observer, peripheral, and broadcaster roles with up to 20 concurrent connections along with one Observer and one Broadcaster
-Extended Advertising support
--Advertising and scanning up to 255 bytes of advertising data in an advertising event
--Advertising, scanning, and connecting on all supported PHYs
--Anonymous advertising
-Configurable number of connections and connection properties
-Configurable attribute table size
-Custom UUID support
-Link layer supporting LE 1M PHY, LE 2M PHY, and LE Coded PHY
-LL Privacy, including for the Extended Advertising modes
-LE Data Packet Length Extension
-ATT and SM protocols
-L2CAP with LE Credit-based Flow Control
-LE Secure Connections pairing model
-GATT and GAP APIs
-GATT Client and Server
-Configurable ATT MTU
2. Complementary nRF5 SDK including Bluetooth profiles and example applications
3. Master Boot Record for over-the-air device firmware update
-SoftDevice, application, and bootloader can be updated separately
4. Memory isolation between the application and the protocol stack for robustness and security
5. Thread-safe supervisor-call based API
6. Asynchronous, event-driven behavior
7. No RTOS dependency
-Any RTOS can be used
8. No link-time dependencies
-Standard ARM® Cortex®-M4 project configuration for application development
9. Support for concurrent and non-concurrent multiprotocol operation
-Concurrent with the Bluetooth stack using Radio Timeslot API
-Alternate protocol stack in application space
10. Support for control of external power amplifiers and low noise amplifiers
11.Quality of service feature for channel monitoring
