eap_peer_config::client_cert field

client_cert - File path to client certificate file (PEM/DER) This field is used with EAP method that use TLS authentication. Usually, this is only configured for EAP-TLS, even though this could in theory be used with EAP-TTLS and EAP-PEAP, too. Full path to the file should be used since working directory may change when wpa_supplicant is run in the background. Alternatively, a named configuration blob can be used by setting this to blob://blob_name.