Can someone tell me if that is normal or why I see this on a daily basis?
if the hub led goes blue, means a device with the app connects to it … maybe in background or when you are looking at the weather in the app, if in range it will connect to the hub (blue led). Once the link is cut it hops back to wifi (green led)
blue means it is connected via bluetooth. Now if you named your wifi network greentooth…it all starts to make sense.