On RZ/T1 Ethernet setup, cre_soc fails with E_PAR for second socket

Question

I am trying to add another socket connection for the same port for Ethernet / TCP/IP. 
 
 Existing code does this ( and succeeds ) 
 HostEndPoint.port = TCPSocketPort; HostEndPoint.num = 1; /* device number */ HostEndPoint.ver = IP_VER4; HostEndPoint.ipa = INADDR_ANY; 
 ReturnValue = cre_soc ( IP_PROTO_TCP, &HostEndPoint ); 
 
 But adding the following, fails: 
 HostEndPoint2.port = TCPSocketPort; HostEndPoint2.num = 2; /* device number */ HostEndPoint2.ver = IP_VER4; HostEndPoint2.ipa = INADDR_ANY; 
 ReturnValue2 = cre_soc ( IP_PROTO_TCP, &HostEndPoint2 ); 
 ReturnValue2 is E_PAR, which indicates "Host" problem according to docs. 
 
 Looking for some guidance on how to track this down. 
 
 Thanks, 
 J.

egret · Accepted Answer

Hi, 
 An E_PAR error in this case probably means that the specified address is in use. 
 To create multiple passive connections on the same TCP port: 
 
 Call cre_soc to prepare the socket, then call con_soc to wait for a connection (SOC_SER). 
 Do this for as many passive connections as you want. 
 
 Upon receiving a connection request from a peer, a connection is established on one of the listening sockets. 
 BR

On RZ/T1 Ethernet setup, cre_soc fails with E_PAR for second socket

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