We have an front hall light where the old fashioned wall switch was in an awkward location. For a while, our solution was to leave the switch on with a $15 motion sensing bulb from ebay installed.
I decided to “uograde” to a system that would integrate with Smartthings, so I bought a Multisensor 6 and one of Aeotecs mini inline relays/dimmers.
Both devices paired just fine. The problem is that it takes about 15 seconds between walking in front of the motion detector and the light actually coming on. The green light on the sensor lights up almost immediately.
I have tried the native smartthings handler as well as both of the custom handlers that are often discussed in forum threads for the multisensor. I have also tried connecting the two devices using both a native routine, and the smart lights smart app. Nothing improves the response time.
Finally, I should note that I have second sensot doing the same thing in a different area of the house, and the response time is almost immediate.