move kuka with phantom omni

Hi,
I started to import my Kuka model on unity and connect it to ROS with the RosBridgeClient.
After have subscribed the tip of the kuka to the correct topic, I was able to move only the tip, while the rest of the kuka remained stationary despite every link was linked to the following one by a joint.
How can I move the whole kuka by controlling his tip?

Thanks for your availability,
Enrico

You need IK solver.
I used other kuka robot manipulator, with Bio IK asset, in my old project.

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Where can I get it?
Thanks

Bio IK is in asset store.

I used Bio IK extensively to derive servo rotations for an animatronic stage show control system.I had tried to decompose hip and shoulder rotations and restrict IK to 3 z axis with Final IK it was a fail no matter the approach with gimbal lock and joint flipping like crazy. Bio IK allowed this due to having been created for robotics.