: API calls

The S140 SoftDevice provides Application Programming Interface (API) functions for handling radio timeslots.

The API functions are defined in the following table.

Table 1. API calls
API call	Description
`sd_radio_session_open()`	Open a radio timeslot session.
`sd_radio_session_close()`	Close a radio timeslot session.
`sd_radio_request()`	Request a radio timeslot.