EAP_CHAP_CHALLENGE_SENT
req->eap_chap_status = EAP_CHAP_CHALLENGE_SENT;
if (req->eap_chap_status != EAP_CHAP_CHALLENGE_SENT)
req->eap_chap_status = EAP_CHAP_CHALLENGE_SENT;
case EAP_CHAP_CHALLENGE_SENT: return "Challenge-Sent";