I have this app working on 3 other devices here, I recently factory reset an iphone and after downloading iDMSS Plus app, it pulled down an updated version (3.43) and I cannot get it working on P2P.
I've updated to iOS 10 but it wasn't working before the update either. I've deleted it, reinstalled it, rebooted the phone, etc, tried installing the lite version, nothing. Meanwhile, all three other iOS devices, same settings, and two laptops, all work.
It has to be this latest version of iDMSS, I can't think what else it could be.