The big challenge is that rubber encased kegs are difficult to attach IoT sensors to. They don’t have any rolled rims or “grabby bits” for a sensor to hook into and the only grabby bits are the hand holes which are already important for handling.
We initially devised an attachment plan that would make MacGyver proud, but learned that space needs to be allocated for the locating rings on kegs atop each other when stacking.
Working with Hans from HHH (our local “no job too hard” engineering genius) we found a way to reliably attach our sensors. He also made sure they were in a location that would face our coupler detection sensor, while still not affecting the stackability of the kegs.