I have tried again to join the IQ Panel 4 to Smartthings after the 4.0.1 update and still have the same problem.
I have used the steps on the link you have provided as well as several other similar sites. That is how I was able to even see the DSK pin code in the first place.
Again, the problem is Smartthings does not allow you to initiate a joining / pairing by entering a DSK pin code alone. That is a step after the initial pairing, handshake takes place to facilitate a secure connection. Smartthings will begin a pairing process using a QR code or by “scanning” for an available device. The problem is that the IQ Panel 4 does not provide a QR code and doesn’t seem to be announcing itself as an available device when I initiate the join process on the panel.
I had experienced a problem with adding a z-wave device to the IQ Panel 4 as a test to see if the Z-wave radio was even working at all. The first several attempts failed or actually timed out with the panel never seeing the available device that was in pairing mode. After rebooting the IQ Panel 4, I was able to discover and pair a device which I then removed so that I could try and join the panel to the smartthings again.
I have used the smartthings to create user codes so people can get in and out of my doors for now but it does defeat the purpose of upgrading my system from a 2Gig to the IQ Panel 4 system.
I cannot contact Qolsys direct according to their tech support and must go through my service provider.
Thank you for continuing to try and resolve the issue I am having.