Mikrotik network devices

Disconnect with worse signal quality than -80dBm:

/caps-man access-list
add action=accept interface=all signal-range=-80..120
add action=reject interface=all signal-range=-120..-81

since RouterOS 6.42 you can add a time limit:

/caps-man access-list
add action=accept signal-range=-80..120 allow-signal-out-of-range=00:00:10
add action=reject

→ every client with less than 80dBm signal quality gets disconnected after 10s.

Sources:

faster roaming