S120 is a Bluetooth Low Energy protocol stack solution with up to eight Central role communication. Like S110, it provides a full and flexible API to build BLE SoC applications. Some of the key features of this SoftDevices are:

• Bluetooth 4.2 enabled single-mode protocol stack
• Thread-safe based API
• Link Layer
• L2CAP, ATT, GATT (client and server) and GAP
• Central/Observer role with up to 8 simultaneous connection
• SM Including MITM and OOB pairing
• Bluetooth examples to implement custom applications
• ARM Cortex-M0 project configuration for application development