Make a folder on your pc, C:\Users\Public\Documents\Hexagon\ZGSensor   That's where HHScan puts their data

In the ZGScannerAddIn:

Look at CreateFileWatcher, where we create the watcher, telling it where to look and what to look for, the FileCreated event

Look at the OnFileCreated handler.  We just try to open the file in a loop until we succeed.  That's how we know their done writing it.
Note that if it is a txt file, we check the first line to see if it is cloud data, and not a geom feature.  Cloud data is "validData". We really should have called that "validCloudData", since otherwise, it is assumed to be geom data.

And finally, look at ProcessGeomFeatureFile, where we do just that once we know a txt is a feature file.

Re. their geom formats
I have searched my email, and cannot find the file formats as presented to me.  Please contact LU Mingyu mingyu.lu@hexagon.com (developer), and Darren Goh darren.goh@hexagon.com (Hex product support).  They can send it straight away.