inactivity timer was on default value - 1800 sec = 30 min
BUT as you can see disconnect message was disconnected from WLAN [...], after  secs
(for info client was MacBook Air)
Ashok, pls give me link where i can read about Band Steering realization in E400
because I don't understand what mean option
What radio preffered?
I have walls on Radio path - and 5GHz has low SNR, but 2.4GHz getting normal SNR - but with Normal Band Steering - Client do not recconnected to 2.4GHz
Can I manualy set SNR for recconnection from 5GHz to 2.4GHz (like in Enhanced Roaming)
As i mentioned in earlier if AP receives single data packet from client then timer starts from that point.
In your case client stopped sending data transfer after some time(roughly after 2800sec) from this instance counter starts again
In another way AP received last data packet from this client at 2800sec after that it didn't received any packet so AP disconnected the client by sending inactivity event.
Check this link will give you an idea about bandsteering
Low : Attempt steering towards 5GHz, but allow clients on 2.4GHz sooner
Normal : Attempt steering towards 5GHz, but allow clients on 2.4GHz after a few attempts
Aggressive : Aggressively attempt steering towards 5GHz, delaying new 2.4GHz associations longer