Ask HN: Need a business attorny/help (eng who has a company who wants our stuff)

HN: please haalp... -- We are engineers that has a hardware product which another company wants to license. Based on their business model - their entire offering can only succeed if they use our product. What sort of licensing agreement should be in place which states they wont reverse engineer/steal our tech (we have patents, but this device is a sensor-dense device and while it could be copied, it still would be hard to do so, but doable none-the-less... How to protect ourselves? They want ~20 of our devices (our devices are effectively a sensor pack in a wall wart which captures a lot of telemetry data to determine the health of the person(s) in the space.... This company wants to sub-license our devices for their health monitoring... We are just simple engineers who know how to track anything you do, but don't know how to write an agreement.. I reached out to a friend who is the DA for the state of CA (but for cannabis, so his suggestion was to contact a busniss atty... which I did - but they said they couldn't help me, so I don't know where to turn aside from writing my own poorly worded agreement)