WLAN QoS setting: WMM vs SSID?

Solution 1:

From @akostadinov's answer:
"One can create multiple SSIDs in the router. Then assign a different QoS value for each SSID."

The SSID here means that you'll have the QoS set based on the SSID priority value.

https://fccid.io/Q78-ZXW3512C/User-Manual/User-Manual-1928235
And according to the manual, it's simply that higher number will have higher priority, not 0-1 for background and etc.

"SSID Name
Set a name for this SSID. A name is composed of 1–32 characters.
Priority
Set the SSID priority ranging from 0 to 7. The default value is 0, indicating no priority is set. A greater value indicates a higher priority."

Solution 2:

I found answer in another language (thanks google translate). Basically one can create multiple SSIDs in the router. Then assign a different QoS value for each SSID.

There is a list with the meaning of each priority number, e.g. for video, background, etc. It is not that x is better or worse than x+1. So check the table as to what value to set.

On a more careful read I see that from 0 to 7 priority is increasing as Đặng Quốc Trung pointed out.