Daniele Lacamera / PicoTCP Featured

Free (GPLv2) TCP/IP stack developed by TASS Belgium

Dependents:   lpc1768-picotcp-demo ZeroMQ_PicoTCP_Publisher_demo TCPSocket_HelloWorld_PicoTCP Pico_TCP_UDP_Test ... more

PicoTCP. Copyright (c) 2013 TASS Belgium NV.

Released under the GNU General Public License, version 2.

Different licensing models may exist, at the sole discretion of the Copyright holders.

Official homepage: http://www.picotcp.com

Bug tracker: https://github.com/tass-belgium/picotcp/issues

Development steps:

  • initial integration with mbed RTOS
  • generic mbed Ethernet driver
  • high performance NXP LPC1768 specific Ethernet driver
  • Multi-threading support for mbed RTOS
  • Berkeley sockets and integration with the New Socket API
  • Fork of the apps running on top of the New Socket API
  • Scheduling optimizations
  • Debugging/benchmarking/testing

Demo application (measuring TCP sender performance):

Import programlpc1768-picotcp-demo

A PicoTCP demo app testing the ethernet throughput on the lpc1768 mbed board.

Last commit 17 May 2013 by TASS Belgium

Diff: modules/pico_tcp.c

Revision:
122:5b1e9de8bf7f
Parent:
117:b853bfe76990
Child:
123:dd26752a4538
--- a/modules/pico_tcp.c	Thu Nov 21 09:35:58 2013 +0000
+++ b/modules/pico_tcp.c	Thu Nov 21 09:48:05 2013 +0000
@@ -21,7 +21,7 @@
 #define SEQN(f) ((f)?(long_be(((struct pico_tcp_hdr *)((f)->transport_hdr))->seq)):0)
 #define ACKN(f) ((f)?(long_be(((struct pico_tcp_hdr *)((f)->transport_hdr))->ack)):0)
 
-#define PICO_TCP_RTO_MIN 10
+#define PICO_TCP_RTO_MIN 50
 #define PICO_TCP_RTO_MAX 120000
 #define PICO_TCP_IW 		 2
 #define PICO_TCP_SYN_TO	 1000u
@@ -854,7 +854,9 @@
 {
   struct pico_socket_tcp *t = (struct pico_socket_tcp *)arg;
   IGNORE_PARAMETER(when);
-  if (TCPSTATE(&t->sock) == PICO_SOCKET_STATE_TCP_SYN_SENT) {
+  if (TCPSTATE(&t->sock) == PICO_SOCKET_STATE_TCP_SYN_SENT
+	&& !(t->sock.state & PICO_SOCKET_STATE_SHUT_LOCAL)
+	&& !(t->sock.state & PICO_SOCKET_STATE_SHUT_REMOTE)) {
     if (t->backoff > PICO_TCP_MAX_CONNECT_RETRIES) {
       tcp_dbg("TCP> Connection timeout. \n");
       if (t->sock.wakeup)
@@ -1117,7 +1119,7 @@
     hdr->seq = 0U;
   }
 
-  hdr->ack = hdr_rcv->seq + long_be(fr->payload_len);
+  hdr->ack = long_be(SEQN(fr) + fr->payload_len);
 
   t->rcv_ackd = t->rcv_nxt;
   f->start = f->transport_hdr + PICO_SIZE_TCPHDR;
@@ -1969,7 +1971,6 @@
     /* the RST is acceptable if the ACK field acknowledges the SYN */
     if ((t->snd_nxt + 1) == ACKN(f)) {  /* valid, got to closed state */
       tcp_force_closed(s);
-      tcp_wakeup_pending(s, PICO_SOCK_EV_FIN);
       pico_err = PICO_ERR_ECONNRESET;
       tcp_wakeup_pending(s, PICO_SOCK_EV_ERR);
       pico_socket_del(&t->sock);  /* delete socket */
@@ -2418,6 +2419,13 @@
 	struct pico_socket_tcp *t=(struct pico_socket_tcp *)sck;
 	if(t->tcpq_out.frames == 0)
 	{
+	    // canceling retrans timer when closing
+		if(t->retrans_tmr)
+	    {
+		    pico_timer_cancel(t->retrans_tmr);
+		    t->retrans_tmr = NULL;
+  	    }
+
 		if(!checkLocalClosing(sck))
 			checkRemoteClosing(sck);
 	}