Set your wpa_supplicant to use the BSSID of the repeater’s access point and don’t put the SSID in the conf file. Then it will connect to only the repeater.
If the repeater just re-transmits tho main AP’s BSSID and packets, you need a better setup. Cheap WiFi extenders do this and almost always cause collisions, making the overall speed slow at all points.
Set your wpa_supplicant to use the BSSID of the repeater’s access point and don’t put the SSID in the conf file. Then it will connect to only the repeater.
If the repeater just re-transmits tho main AP’s BSSID and packets, you need a better setup. Cheap WiFi extenders do this and almost always cause collisions, making the overall speed slow at all points.
The best setup is to have multiple wired APs.