Max decode session timeout is 9.9 seconds
Seems you have two options
Option 1: have timer to send trigger event each 10 seconds and reset it at barcode event .
Option 2: set the decoder into présentation mode , this will allow the engine to start decode session automatically when detecting barcode . You can add scan enable disable events to control the decoding session if needed .
In case you still require decode session to be above 10 seconds them only left option is to request custom firmware through your zebra account team or distributor .

Regards
Riad

You will have to change trigger mode setting parameter #138 . By default it's set to standard level . Change it to Presentation Blink .
The enable / disable can be achieved using api DCSSDK_DEVICE_SCAN_ENABLE and DCSSDK_DEVICE_SCAN_DISABLE ( refer to https://techdocs.zebra.com/dcs/scanners/sdk-android/dev-guide/ )

Here description of all different set for that parameter .

*Standard (Level) - A trigger press activates decode processing. Decode processing continues until
the barcode decodes, you release the trigger, or the Decode Session Timeout on occurs.
• Presentation (Blink) - The decoder activates decode processing when it detects a barcode in its field
of view. After a period of non-use, the LEDs turn off until the decoder senses motion.
• Host - A host command issues the decode signal. The decoder interprets an actual trigger pull as a
Level triggering option.
• Auto Aim - The decoder projects the aiming pattern when the decoder senses motion. A trigger press
activates decode processing. After a period of inactivity the aiming pattern shuts off.
• Auto Aim with Illumination - The decoder projects the aiming pattern and internal illumination LEDs
when the decoder senses motion. A trigger pull activates decode processing. After 2 seconds of
inactivity the aiming pattern and internal illumination LEDs automatically shut off.