There would be two possibilities. Or you add a separate SSID for your non dot1X devices. Or you enable the MAC authentication bypass feature of your RADIUS server. The RADIUS server receives the client's MAC address from the AP, so it could let those devices in without needing to go through the auth process. Note that this can be a security issue as anyone can spoof a MAC-address. So you should make sure that you limit the access of those devices in some way, either by applying a group policy to them, or by assigning them a specific VLAN.
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