Good catch
.
It's a test that I'm doing with Webdeck to get better status updates back and forth to Homebridge. HB only polls Indigo in intervals and if you turn a light off in Indigo it's not immediately reflected in your HomeKit app, this test was some API's that Webdeck built into HB-Indigo that lets me tell HB when something changed in Indigo.
Since we got to working on incorporating the entirety of HB and HB-Indigo into HBB we haven't spent much time working on this so it will come up again after I get that done. The reason why it is experimental is because it COULD cause lots of errors in Indigo if you have a version of HB-Indigo that doesn't yet honor that or if it's been disabled by Webdeck for now while we work on other stuff.