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Configure TCP connection's maximum number of consecutive keep-alives to transmit.

Files

net_tcp.h/net_tcp.c

Prototype

          CPU_BOOLEAN NetTCP_ConnCfgTxKeepAliveTh(NET_TCP_CONN_ID  conn_id_tcp,
                                                  NET_PKT_CTR      nbr_max_keep_alive,
                                                  NET_ERR         *perr);

Arguments

conn_id_tcp

Handle identifier of TCP connection to configure transmit keep-alive threshold.

...

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 transmit keep-alive enable successfully configured;

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 Nagle algorithm. */
              NetTCP_ConnCfgTxKeepAliveTh(conn_id_tcp, 15u, &err);
          }

NetTCP_ConnCfgTxKeepAliveTh() 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.