Found this in the tech docs of Meru.
Via CLI commands on the Meru controller CLI
To enable the station log while in the Meru controller CLI, enter these commands:
Enter the interactive per-station event logging shell:
wlan-controller # station-logAfter entering "station-log" the prompt will change to "station-log>" at which point the following commands can be entered (where <MAC address> is the station's MAC address containing colons):
station-log> station add <MAC address>At this point, the Meru controller will display information about the specified station(s), specifically, debug messages for the station's 802.11 connection.
station-log> station del <MAC address>
Via Meru Controller Web UI
The station log for a specific station can also be obtained via the Meru controller Web UI under Monitor > Diagnostics > Station.
1. Enter MAC address containing colons and click on "Start Diagnostics".
2. Select "Station Diagnostics".
3. To disable logging of the station log, click on "Stop Diagnostics".