My first thought was "why" given how reliable (and full of repeaters/routers, given that the #1 usage is bulbs and lightstrips that all are) the system is, but I see you came from a thread about rack-mounting, so it makes sense now. 
Continuing from there:
There may be something, but I'm not aware of anything. The API has a generic "connectivity status"-type attribute for each device, but it only reports status like "connected" or "disconnected" and nothing I remember about LQI or other objective measurements.
