Glad to hear you are working on a WiFi solution.
Are you are of CamRanger - ? it appears they essentially use a $50 generic USB-Wi-Fi dongle that they have probably just re-branded.
This avoids the need for everyone to buy overpriced OEM WiFi dongles that often won't allow complex tethered shooting anyway.
This reviewer cleverly identified the dongle source
http://fstoppers.com/fstoppers-reviews- ... hered-ever
Whilst not at the same level as HR for stacking, their (more expensive BTW) tether software/dongle solution does perform similar functionality to HM.
With respect, I really think HeliconSoft need to chase this - if CamRanger can do it why not HeliconSoft?
Regards
Brian