Configure TCP connection’s maximum number of same segment retransmissions.

Files

net_tcp.h/net_tcp.c

Prototype

          CPU_BOOLEAN NetTCP_ConnCfgReTxMaxTh(NET_TCP_CONN_ID  conn_id_tcp,
                                              NET_PKT_CTR      nbr_max_re_tx,
                                              NET_ERR         *perr);

Arguments

conn_id_tcp

TCP connection handle ID to configure maximum number of same segment retransmissions.

nbr_max_re_tx

Desired maximum number of same segment retransmissions.

perr

Pointer to variable that will receive the return error code from this function:

NET_TCP_ERR_NONE
NET_TCP_ERR_INVALID_ARG
NET_TCP_ERR_INVALID_CONN
NET_TCP_ERR_CONN_NOT_USED
NET_ERR_INIT_INCOMPLETE
NET_OS_ERR_LOCK

Returned Value

DEF_OK,

TCP connection’s maximum number of retransmissions successfully configured, if no errors.

DEF_FAIL,

otherwise.

Required Configuration

Available only if TCP is enabled (see TCP Layer Configuration).

Notes / Warnings

The conn_id_tcp argument represents the TCP connection handle – not the socket handle. The following code may be used to get the TCP connection handle and configure TCP connection parameters (see also NetSock_GetConnTransportID):

          NET_SOCK_ID     sock_id;
          NET_TCP_CONN_ID conn_id_tcp;
          NET_ERR         err;
           
          sock_id     = Application's TCP socket ID; /* Get application's TCP socket     ID. */
                                                     /* Get socket's      TCP connection ID. */
          conn_id_tcp = (NET_TCP_CONN_ID)NetSock_GetConnTransportID(sock_id, &err);
           
          if (err == NET_SOCK_ERR_NONE) {/* If NO errors, ...                                           */
                                         /* ... configure TCP connection maximum re-transmit threshold. */
              NetTCP_ConnCfgReTxMaxTh(conn_id_tcp, 4u, &err);
          }

NetTCP_ConnCfgReTxMaxTh() is called by application function(s) and must not be called with the global network lock already acquired. It must block all other network protocol tasks by pending on and acquiring the global network lock (see “net.h Note #3”). This is required since an application's network protocol suite API function access is asynchronous to other network protocol tasks.

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