ximea triggers with software even when trigger mode is not software

[carandraug]

Documentation for XI_PRM_TRG_SOFTWARE parameter says:

Generates an internal trigger. XI_PRM_TRG_SOURCE have be set to TRG_SOFTWARE.

However, an internal trigger is generated and an image is acquired even if set to hardware trigger:

from ximea import xiapi

img = xiapi.Image()
c = xiapi.Camera()
c.open_device()

c.set_trigger_source('XI_TRG_EDGE_RISING')
c.set_trigger_selector('XI_TRG_SEL_FRAME_START')

c.start_acquisition()

c.get_image(img, 1) # will timeout because there's been no trigger yet

# Either set_trigger_software should raise an exception because we are not
# on software trigger mode, or it should do nothing because the trigger should
# be ignored. But instead, we do get an image.
c.set_trigger_software(1) # also, the value for this seems to make no difference
c.get_image(img, 1) # should have had timeout but does not

Also, what's the point of passing a value to set_trigger_software? It's not documented anywhere and seems to do nothing.

[carandraug]

This has been reported to ximea and is ticket 55455 on ximea's ticket system (which unfortunately is private).

[carandraug]

Ximea acknowledges this behaviour and have no intention on changing it:

It is a known feature for cameras in MQ camera family and we do not plan to change it.
Is this behavior in any way complicating the creating of your program?
Next, the value sent to parameter XI_PRM_TRG_SOFTWARE is irrelevant, it behaves the same with 0, 1 or 999.