Opentrack doesn't receive data from FreePIE IMU but receives from another app

[StuDentBRz]

I am trying to use opentrack with FreePie IMU, on my android smartphone with gyroscope and accelerometer , but i am having some trouble...
I can see on FreePIE IMU on Android that it is getting the acelerometer and gyroscope data, but opentrack won't receive any of this data. I've tried via wi-fi network and USB tether, i always configured the same IP and ports, and even disabled windows firewall and nothing worked.
It's not a problem on my network, because i've tested with another app on android (HeadTracker from play store) and also changed the input from FreePIE UDP receiver to UDP over network and then opentrack received the data as it should...