Access point WDS and client WDS network only.
Is there a way to enable 4-address link (wds client) and disable 3-address links (smartphone, notebook)?
Change the password?
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Yes the simplest way would be to not give the password to any regular clients. Create a separate AP for them with a different SSID and password.
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[...]
Fri Nov 25 22:27:58 2022 daemon.notice hostapd: wlan0: AP-STA-POSSIBLE-PSK-MISMATCH
Fri Nov 25 22:27:59 2022 daemon.notice hostapd: wlan0: AP-STA-POSSIBLE-PSK-MISMATCH
Fri Nov 25 22:28:00 2022 daemon.notice hostapd: wlan0: AP-STA-POSSIBLE-PSK-MISMATCH
[...]
over and over!
That merely means that a client is trying to connect with the wrong preshared key (password). The AP rejects it, those messages are informational only.
You can block (or allow) clients by MAC address.