The original fob doesn't start it though when pressing 3 times the unlock button.
I know this thread is old but I just wanted to say you likely need to press Lock x 3, not Unlock x 3. Sometimes it's Lock, Unlock, Lock. But Lock x 3 is the default OEM fob start procedure for iDataStart.
FWIW the 'OEM' remote start you see referenced in here a bunch looks like a generic CompuStar starter to me. And I think that may even be the same company as iDataStart anwyay. OEM is often not
really OEM but some kind of partnership or licensing deal.
The iDataStart product is not vehicle-specific (and the CompuStar one probably isn't either). These days they are universal and the installer (or end user in some cases) can flash/program them to a specific vehicle. The only hardware that is vehicle specific is the harness, if one is even used. You can also wire the starter yourself if you wish using the included generic harness. With the iDataStart you can plug in various accessories, too, such as a different antenna for different remotes, or a phone app-based dongle, or temperature/tilt/motion sensors, etc.
I purchased the iDataStart HC2 (which is what you have) for my 2016 Sorento SX Turbo. Their T-harness for push-to-start Sorentos which requires only one connection to the vehicle (although it may be blocked with tamper-proof bolts). Aside from removing those bolts, it's supposed to be very simple to install (I will be installing mine in a day or two).
I also had the iDataStart HC1 for my 2013 Hyundai Santa Fe Sport Limited before I traded it in. On this vehicle there were only 9 wires that needed to be tapped into, so I didn't buy a T-harness, and instead just used the generic harness and wire taps. It wasn't too bad to install and works perfectly, which is why I was happy to buy another one for the Sorento.
Both the HC1 and HC2 are packages that include a iDataStart HCX control box and either a set of 1-way or a set of 2-way remotes. You can buy the HCX box by itself if you only care to start your vehicle with the OEM fob - It's $150 CAD. I think the HC1 goes for $250 CAD and the HC2 for $300 CAD. Plus a T-harness, if you want/need one, will be around $60-75 CAD.
On the Santa Fe Sport I can't turn on the heated/cooled seats or the heated steering wheel with my starter. At least not without some custom wiring and changing the programming to use said wiring.
On the Sorento there's a chance these features might work out of the box, but I don't know yet. While flashing/programming the control box I noticed some options for it.