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.
The SoftDevice API documentation is available for different versions of the SoftDevice.