The terms on this are very restrictive. They allow Estimote to screw you over later. They could raise the service charge on your existing system, turn off your beacons, and prevent you from using devices that don't pay them with their beacons[1]. You're not even allowed to try to improve on the accuracy of the location info they let you have.

Customer shall not, and shall not permit others to:

- use the SDK for any purpose other than for the Purpose set forth in Sub-section 5(a) of this Agreement;

- reproduce, in whole or in part, the Software Development Kit; except as expressly provided in Sub-section 5(a) with respect to the Sample Code, modify, translate, reverse engineer, decompile, disassemble or otherwise attempt (y) to defeat, avoid, bypass, remove, deactivate or otherwise circumvent any software protection mechanisms in the Software Development Kit or the Beacons or components thereof, including without limitation any such mechanism used to restrict or control the functionality of the SDK or the Beacons, or (z) to derive the source code or the underlying ideas, algorithms, structure or organization from the SDK or the Beacons or components thereof;

- except as expressly provided in Sub-section 5(a) with respect to the Sample Code, alter, adapt, modify or translate the SDK in any way for any purpose, including without limitation error correction ...

All your robots are belong to us.

These are terms for an ad-oriented system, which is what they really do. The system is intended for collecting data on customers. ("Harrods, the world-famous department store now has indoor navigation in more than 330 departments, thanks to Estimote Beacons. A system has been installed in order to 'assist shoppers to find a particular brand'.") Those are not suitable terms for the system that runs your warehouse robots.

[1] https://estimote.com/legal/terms-of-sale.html