SVCALL(SD_BLE_GAP_CONNECT,

[wbporow]

I'm trying to understand example "ble_app_hts" how after advertising make a connection. I didn't see in code any call of function "sd_ble_gap_connect" ? how is made connection ?

[bjorn-spockeli]

The SoftDevice API uses SuperVisor Calls( SVCs) to exposes the functionality of the SoftDevice , this is stated here in the S130 SoftDevice Specification.

The SoftDevice is delivered as a precompiled binary and the SVCs are used to expose the SoftDevice functions without having any link-time dependencies between the application and the BLE protocol stack.

[bjorn-spockeli]

Take a look at the BLE examples in the SDK, see this Infocenter page.

All application examples include the SoftDevice Event Handler module, which contains a BLE stack interrupt handler (SWI2_IRQHandler). This interrupt handler will be called each time the stack wants to pass an event to the application. The handler reads the stack event, and passes the event to the application through a callback function.