Perhaps a utility to test latency between Access Point and SM?
Wouldn’t a ping give you this answer, for the most part at least?
If you telnet to an AP and then ping an SM, you just get a message “x.x.x.x is alive”. Since we are not using public IP’s on our Canopy Radios (right?) anything more is not required.
To isolate where a problem might be, I start a terminal ping to the AP, and terminal ping to the SM and compare the two.