iOS Sdk listen to Trigger Pressed event


Audience

Hi,

i would like to listen to the event when the trigger is pressed on the hardware scanner device. But i can not find any event. Based on the documentation only those events are available:
Valid notification/event mask values include:
• SBT_EVENT_BARCODE
• SBT_EVENT_IMAGE
• SBT_EVENT_VIDEO
• SBT_EVENT_SCANNER_APPEARANCE
• SBT_EVENT_SCANNER_DISAPPEARANCE
• SBT_EVENT_SESSION_ESTABLISHMENT
• SBT_EVENT_SESSION_TERMINATION
• SBT_EVENT_RAW_DATA.

is there any possibility to get catch trigger pressed event?
thanks
Philipp