DHCP wrong UDP condition

[mrx23dot]

for W5500

In DHCP_run

  if(getSn_SR(DHCP_SOCKET) != SOCK_UDP)
     socket(DHCP_SOCKET, Sn_MR_UDP, DHCP_CLIENT_PORT, 0x00);
         setSn_MR(sn, (protocol | (flag & 0xF0)));
         setSn_PORTR(sn,port);
         setSn_CR(sn,Sn_CR_OPEN);   //opens UDP socket
         while(getSn_CR(sn))   // this times out, CR content is  2,  which means LISTEN,

eventhough it says
// After W5500 accepts the command, the Sn_CR register is automatically cleared to 0x00.
so which is it 0 or 2?