I got my 4C a couple days ago and I thought I’d share my experience. I plugged it in and installed the software, which then said something like, “There’s a problem, contact support.” The Event Log showed:

2016-12-17 16:21:33,917 [12] WARN Tobii.EyeX.Common.Statistics.StatisticsLogger [(null)] - Unable to record entry 'app.startup.done'. Reason: Illegal Level parameter. Must be set and not be ALL or NONE

Application: Tobii.Service.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.InvalidOperationException
at System.ThrowHelper.ThrowInvalidOperationException(System.ExceptionResource)
at System.Collections.Generic.List`1+Enumerator[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].MoveNextRare()
at System.Collections.Generic.List`1+Enumerator[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].MoveNext()
at Tobii.Service.Plugin.TobiiPluginManager.BroadcastMessage(Tobii.Service.Plugin.Interface.ITobiiServiceMessage)
at Tobii.Service.TobiiService.ServiceControlHandler(Int32, Int32, IntPtr, IntPtr)
at System.ServiceProcess.NativeMethods.StartServiceCtrlDispatcher(IntPtr)
at System.ServiceProcess.ServiceBase.Run(System.ServiceProcess.ServiceBase[])
at Tobii.Service.Program.Main()

Faulting application name: Tobii.Service.exe, version: 1.16.0.7081, time stamp: 0x583d57fd
Faulting module name: KERNELBASE.dll, version: 10.0.10240.16384, time stamp: 0x559f3b2a
Exception code: 0xe0434352
Fault offset: 0x000b3e28
Faulting process id: 0x7ab8
Faulting application start time: 0x01d25878d53a4405
Faulting application path: C:\Program Files (x86)\Tobii\Service\Tobii.Service.exe
Faulting module path: C:\Windows\SYSTEM32\KERNELBASE.dll
Report Id: 31015901-3dfb-4902-9bc6-d044844a1723
Faulting package full name:
Faulting package-relative application ID:


No amount of restarting the software or replugging the device helped. I rebooted and chose a different USB port, then it worked fine. I don’t know which of the two might have fixed it, but it wasn’t a great first impression.

After that initial bump in the road, everything else was great. The device is super cool. 🙂 I bought it as a toy to see how well mouse control works. Mouse warp on move is neat, but I found I don’t want it to always activate. Mouse warp on hotkey is also neat, but I found it too inaccurate.

Next I checked out your SDK. The documentation and samples are very nice, kudos! In 30 minutes I had a Java (a language I prefer) wrapper for your C API and was getting events. After trying a few things, I ended up with an eye tracking + head tracking combination that works really well, check it out here:

Clippy: accurate mouse control

I think the eye tracking + head tracking combination is really neat. It would be great if you considered adding this feature to mouse warp features. It’s very simple, here’s my implementation:
https://github.com/EsotericSoftware/clippy/blob/2.25/src/com/esotericsoftware/clippy/Tobii.java

A couple minor things about the SDK:

I was unable to figure out how to subscribe to the eye position data stream on my own. I had to find posts on the forum explaining how (I only thought to look for a sample project after that). A mention of how it works in the docs would help.

I’d expect TX_GAZEPOINTDATAEVENTPARAMS Timestamp to be a long. Also, the values never seem to have a fractional part.

If I exit the Tobii app, my app gets a “connectTrying” event. I never receive a “disconnected” event, which is what I’d expect. AFAIK, “connectTrying” wasn’t explained in the docs, so I didn’t know that I should consider it disconnected when receiving that event.

BTW, on these forums when a textbox doesn’t have focus, the text turns gray. That is OK, but I think the gray is much too dim.

Overall, I really like the device and the SDK was a pleasure to work with. I’m interested in your Pro devices and I sent a message to sales through the tobiipro.com website. However, after submitting the message form, the part of the page containing the form just went blank. I have no idea if it actually submitted. I haven’t received any automated email confirmation about it (this happened just minutes ago).