The S122 SoftDevice is a memory-optimized Bluetooth® Low Energy Central protocol stack solution. It supports up to eight connections as a Central with an additional observer role running concurrently. It supports the high-throughput 2 Mbps feature and channel selection algorithm 2 (CSA #2). The number of connections and bandwidth per connection are configurable, offering memory and performance optimization.
S122 SoftDevice Specification
Key features
1. Bluetooth 5.2 compliant single-mode Bluetooth Low Energy protocol stack
-Up to eight central connections and one Observer running concurrently
-Configurable number of connections and connection properties
-Configurable attribute table size
-Custom UUID support
-Link layer supporting LE 1M PHY and LE 2M PHY
-LL Privacy
-ATT and SM protocols
-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. Thread-safe supervisor-call based API
5. Asynchronous, event-driven behavior
6. No RTOS dependency
-Any RTOS can be used
7. No link-time dependencies
-Standard Arm® Cortex®- M4 project configuration for application development
8. Support for concurrent and non-concurrent multiprotocol operation
-Concurrent with the Bluetooth stack using Radio Timeslot API
-Alternate protocol stack in application space
9. Support for control of external power amplifiers and low noise amplifiers
10. Quality of service feature for channel monitoring
