Minor fixs to reduce footprint on the "recv part" of Sequential API...

src/api/api_lib.c

@@ -475,6 +475,7 @@ netconn_recv(struct netconn *conn)
   }
 
   if (conn->type == NETCONN_TCP) {
+#if LWIP_TCP
     if (conn->pcb.tcp->state == LISTEN) {
       conn->err = ERR_CONN;
       return NULL;
@@ -524,7 +525,9 @@ netconn_recv(struct netconn *conn)
       msg.msg.msg.len = 1;
     }
     tcpip_apimsg(&msg);
+#endif /* LWIP_TCP */
   } else {
+#if (LWIP_UDP || LWIP_RAW)
 #if LWIP_SO_RCVTIMEO
     sys_mbox_fetch_timeout(conn->recvmbox, (void *)&buf, conn->recv_timeout);
 #else
@@ -536,6 +539,7 @@ netconn_recv(struct netconn *conn)
        if (conn->callback)
            (*conn->callback)(conn, NETCONN_EVT_RCVMINUS, buf->p->tot_len);
      }
+#endif /* (LWIP_UDP || LWIP_RAW) */
   }
     
   LWIP_DEBUGF(API_LIB_DEBUG, ("netconn_recv: received %p (err %d)\n", (void *)buf, conn->err));

src/api/sockets.c

@@ -437,7 +437,7 @@ lwip_recvfrom(int s, void *mem, int len, unsigned int flags,
   /* If this is a TCP socket, check if there is data left in the
      buffer. If so, it should be saved in the sock structure for next
      time around. */
-  if (netconn_type(sock->conn) == NETCONN_TCP && buflen - copylen > 0) {
+  if ((sock->conn->type == NETCONN_TCP) && (buflen - copylen > 0)) {
     sock->lastdata = buf;
     sock->lastoffset += copylen;
   } else {
@@ -480,7 +480,7 @@ lwip_send(int s, const void *data, int size, unsigned int flags)
 #else
     sock_set_errno(sock, err_to_errno(ERR_ARG));
     return -1;
-#endif  
+#endif /* (LWIP_UDP || LWIP_RAW) */
 
   err = netconn_write( sock->conn, data, size, NETCONN_COPY);