CF auto root method is now available for download for the Samsung Galaxy Tab S2 and it supports all models including SM-T810, T710 and T715.
If you are on android lollipop 5.0.2, then use these download links.
smt810_cf_autoroot
sm-t815_cf_autoroot
smt710_cf-autoroot
smt715_cf-autoroot
Download from these links in case you are on Android lollipop 5.1.1.
t810_cf-autoroot_5.1.1
t710_cf-autoroot_5.1.1
Download the file and flash it using ODIN. To flash, put your Galaxy Tab S2 in download mode. For this press the power and volume down buttons for few seconds and then, connect it to the computer.
Start ODIN on your computer and click on AP button. Then select the file downloaded earlier. Ensure you have disabled auto reboot, f.reset time and repartition. Now click on the Start button to commence flashing process.