EWC V9.21.12 - WLAN running now stable for laptops! Except Android SmartPhones have problems anymore!
If the Smartphone is newly connected all working well - also if i ping the system continiously - no problems. If i stop the ping, then after some time the client have no internet connection - wlan seem to be assiciated. If i disassociate (both sides) and re-connect this device new all working well for several time (minutes). If i restart the AP also all working well for some time. So allways if a smartPhone client is online for more than a few minutes the problem begins (looses IP / Internet Connectivity).
only 2,4Ghz is online, no channel bundeling (20Mhz Channels), no special options set.
After some debugging (wireshark capture) i see that if the clients are not working, the smartphones are sending a lot of "Qos Null function (No data)" packets. If i ask Mr. Google he tell me that this packets managing powersafe modus. Thats correct - wireshark tells in one packet (of the problematic clients) "STA will go to sleep" - next packets tells "STA will stay up" ?! And this toggle several times a second!
So how can i avoid this ?
i cannot disable powersafe mode on clients because i have no access to them. Because this is payed WLAN service we have to provide a working service (without have the ability to tough client systems) and without disruption and re-connects.
How can i solve that problem ?