I am relatively new to FreeRTOS and have ported the FreeRTOS+TCP to a Microsemi Smartfusion2 device. I have a simple application running and the TCP stack is DHCP'ing correctly and responding to Pings. I am in the process of porting a simple application from uClinux on the M2S device to FreeRTOS and have a external Client that works properly with the uClinux applications, but FreeRTOSaccept never seems to return with connection accepted. I am calling it with portMAXDELAY and expect it to wait until a connection is accepted, and then return with the new socket. the following is the output from the debug printfs within the TCP package (along with a few of my own) followed by the wireshark capture of the same session. --

Best I can figure is i might need to setup an event group? FreeRTOS_accept seems to be waiting in xEventGroupWaitBits, but I only have a single server trying to listen on a single port. Any help is appreciated.

Greg

Hello World 0 prvIPTask started Link down prvInitialiseDHCP: start after 250 ticks vDHCPProcess: discover vDHCPProcess: offer 192.168.2.77 ip vDHCPProcess: reply c0a8024d ip vDHCPProcess: offer 192.168.2.77 ip vDHCPProcess: acked c0a8024d ip Link up Socket 5001 -> 0 ip:0 State eCLOSED->eTCPLISTEN prvSocketSetMSS: 1460 bytes for c0a802e7 ip:36774 Socket 5001 -> c0a802e7 ip:36774 State eTCPLISTEN->eSYNFIRST Socket 5001 -> c0a802e7 ip:36774 State eSYNFIRST->eSYNRECEIVED TCP: passive 5001 => c0a802e7 ip:36774 set ESTAB (sock ) Socket 5001 -> c0a802e7 ip:36774 State eSYNRECEIVED->eESTABLISHED Socket 5001 -> c0a802e7 ip:36774 State eESTABLISHED->eLASTACK Socket 5001 -> c0a802e7 ip:36774 State eLASTACK->eCLOSE_WAIT

and the Wireshark capture

No. Time Source Destination Protocol Info 100 2015-03-16 14:34:25.877434000 0.0.0.0 255.255.255.255 DHCP DHCP Discover - Transaction ID 0x47033129

Frame 100: 304 bytes on wire (2432 bits), 304 bytes captured (2432 bits) on interface 0 Ethernet II, Src: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84), Dst: Broadcast (ff:ff:ff:ff:ff:ff) Internet Protocol Version 4, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255) User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67) Bootstrap Protocol

No. Time Source Destination Protocol Info 102 2015-03-16 14:34:25.881171000 192.168.2.1 192.168.2.77 DHCP DHCP Offer - Transaction ID 0x47033129

Frame 102: 342 bytes on wire (2736 bits), 342 bytes captured (2736 bits) on interface 0 Ethernet II, Src: Apple_29:bc:ca (88:1f:a1:29:bc:ca), Dst: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84) Internet Protocol Version 4, Src: 192.168.2.1 (192.168.2.1), Dst: 192.168.2.77 (192.168.2.77) User Datagram Protocol, Src Port: bootps (67), Dst Port: bootpc (68) Bootstrap Protocol

No. Time Source Destination Protocol Info 103 2015-03-16 14:34:25.887449000 0.0.0.0 255.255.255.255 DHCP DHCP Request - Transaction ID 0x47033129

Frame 103: 307 bytes on wire (2456 bits), 307 bytes captured (2456 bits) on interface 0 Ethernet II, Src: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84), Dst: Broadcast (ff:ff:ff:ff:ff:ff) Internet Protocol Version 4, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255) User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67) Bootstrap Protocol

No. Time Source Destination Protocol Info 105 2015-03-16 14:34:25.890746000 192.168.2.1 192.168.2.77 DHCP DHCP ACK - Transaction ID 0x47033129

Frame 105: 350 bytes on wire (2800 bits), 350 bytes captured (2800 bits) on interface 0 Ethernet II, Src: Apple_29:bc:ca (88:1f:a1:29:bc:ca), Dst: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84) Internet Protocol Version 4, Src: 192.168.2.1 (192.168.2.1), Dst: 192.168.2.77 (192.168.2.77) User Datagram Protocol, Src Port: bootps (67), Dst Port: bootpc (68) Bootstrap Protocol

No. Time Source Destination Protocol Info 106 2015-03-16 14:34:25.897022000 c0:b1:3c:83:83:84 Broadcast ARP Gratuitous ARP for 192.168.2.77 (Request)

Frame 106: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface 0 Ethernet II, Src: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84), Dst: Broadcast (ff:ff:ff:ff:ff:ff) Address Resolution Protocol (request/gratuitous ARP)

No. Time Source Destination Protocol Info 130 2015-03-16 14:34:39.117125000 192.168.2.231 192.168.2.77 TCP 35351 > commplex-link [SYN] Seq=0 Win=5840 Len=0 MSS=1460 SACK_PERM=1 TSval=3256700 TSecr=0 WS=64

Frame 130: 74 bytes on wire (592 bits), 74 bytes captured (592 bits) on interface 0 Ethernet II, Src: Vmware_e7:f2:00 (00:0c:29:e7:f2:00), Dst: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84) Internet Protocol Version 4, Src: 192.168.2.231 (192.168.2.231), Dst: 192.168.2.77 (192.168.2.77) Transmission Control Protocol, Src Port: 35351 (35351), Dst Port: commplex-link (5001), Seq: 0, Len: 0

No. Time Source Destination Protocol Info 131 2015-03-16 14:34:39.133153000 192.168.2.77 192.168.2.231 TCP commplex-link > 35351 [SYN, ACK] Seq=0 Ack=1 Win=1460 Len=0 MSS=1460

Frame 131: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface 0 Ethernet II, Src: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84), Dst: Vmware_e7:f2:00 (00:0c:29:e7:f2:00) Internet Protocol Version 4, Src: 192.168.2.77 (192.168.2.77), Dst: 192.168.2.231 (192.168.2.231) Transmission Control Protocol, Src Port: commplex-link (5001), Dst Port: 35351 (35351), Seq: 0, Ack: 1, Len: 0

No. Time Source Destination Protocol Info 132 2015-03-16 14:34:39.133335000 192.168.2.231 192.168.2.77 TCP 35351 > commplex-link [ACK] Seq=1 Ack=1 Win=5840 Len=0

Frame 132: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface 0 Ethernet II, Src: Vmware_e7:f2:00 (00:0c:29:e7:f2:00), Dst: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84) Internet Protocol Version 4, Src: 192.168.2.231 (192.168.2.231), Dst: 192.168.2.77 (192.168.2.77) Transmission Control Protocol, Src Port: 35351 (35351), Dst Port: commplex-link (5001), Seq: 1, Ack: 1, Len: 0

No. Time Source Destination Protocol Info 133 2015-03-16 14:34:39.133420000 192.168.2.231 192.168.2.77 TCP 35351 > commplex-link [PSH, ACK] Seq=1 Ack=1 Win=5840 Len=76

Frame 133: 130 bytes on wire (1040 bits), 130 bytes captured (1040 bits) on interface 0 Ethernet II, Src: Vmware_e7:f2:00 (00:0c:29:e7:f2:00), Dst: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84) Internet Protocol Version 4, Src: 192.168.2.231 (192.168.2.231), Dst: 192.168.2.77 (192.168.2.77) Transmission Control Protocol, Src Port: 35351 (35351), Dst Port: commplex-link (5001), Seq: 1, Ack: 1, Len: 76 Data (76 bytes)

0000 77 00 00 00 01 00 00 00 08 00 00 00 32 00 00 00 w...........2... 0010 c9 f5 6d 00 b0 de 70 00 34 f3 6d 00 01 00 00 00 ..m...p.4.m..... 0020 c4 df 6f 00 7c c5 ee bf 98 ea 6f 00 d0 c4 ee bf ..o.|.....o..... 0030 28 8d 6e 00 c0 c4 ee bf 34 f3 6d 00 b4 c4 ee bf (.n.....4.m..... 0040 3c ea 6f 00 00 00 00 00 00 d9 71 b7 <.o.......q.

No. Time Source Destination Protocol Info 134 2015-03-16 14:34:39.133502000 192.168.2.231 192.168.2.77 TCP 35351 > commplex-link [FIN, PSH, ACK] Seq=77 Ack=1 Win=5840 Len=152

Frame 134: 206 bytes on wire (1648 bits), 206 bytes captured (1648 bits) on interface 0 Ethernet II, Src: Vmware_e7:f2:00 (00:0c:29:e7:f2:00), Dst: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84) Internet Protocol Version 4, Src: 192.168.2.231 (192.168.2.231), Dst: 192.168.2.77 (192.168.2.77) Transmission Control Protocol, Src Port: 35351 (35351), Dst Port: commplex-link (5001), Seq: 77, Ack: 1, Len: 152 Data (152 bytes)

0000 77 00 00 00 01 00 00 00 08 00 00 00 32 00 00 00 w...........2... 0010 c9 f5 6d 00 b0 de 70 00 34 f3 6d 00 01 00 00 00 ..m...p.4.m..... 0020 c4 df 6f 00 7c c5 ee bf 98 ea 6f 00 d0 c4 ee bf ..o.|.....o..... 0030 28 8d 6e 00 c0 c4 ee bf 34 f3 6d 00 b4 c4 ee bf (.n.....4.m..... 0040 3c ea 6f 00 00 00 00 00 00 d9 71 b7 77 00 00 00 <.o.......q.w... 0050 01 00 00 00 08 00 00 00 32 00 00 00 c9 f5 6d 00 ........2.....m. 0060 b0 de 70 00 34 f3 6d 00 01 00 00 00 c4 df 6f 00 ..p.4.m.......o. 0070 7c c5 ee bf 98 ea 6f 00 d0 c4 ee bf 28 8d 6e 00 |.....o.....(.n. 0080 c0 c4 ee bf 34 f3 6d 00 b4 c4 ee bf 3c ea 6f 00 ....4.m.....<.o. 0090 00 00 00 00 00 d9 71 b7 ......q.

No. Time Source Destination Protocol Info 135 2015-03-16 14:34:39.144761000 192.168.2.77 192.168.2.231 TCP commplex-link > 35351 [ACK] Seq=1 Ack=77 Win=1460 Len=0

Frame 135: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface 0 Ethernet II, Src: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84), Dst: Vmware_e7:f2:00 (00:0c:29:e7:f2:00) Internet Protocol Version 4, Src: 192.168.2.77 (192.168.2.77), Dst: 192.168.2.231 (192.168.2.231) Transmission Control Protocol, Src Port: commplex-link (5001), Dst Port: 35351 (35351), Seq: 1, Ack: 77, Len: 0

No. Time Source Destination Protocol Info 136 2015-03-16 14:34:39.150458000 192.168.2.77 192.168.2.231 TCP commplex-link > 35351 [FIN, ACK] Seq=1 Ack=230 Win=1460 Len=0

Frame 136: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface 0 Ethernet II, Src: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84), Dst: Vmware_e7:f2:00 (00:0c:29:e7:f2:00) Internet Protocol Version 4, Src: 192.168.2.77 (192.168.2.77), Dst: 192.168.2.231 (192.168.2.231) Transmission Control Protocol, Src Port: commplex-link (5001), Dst Port: 35351 (35351), Seq: 1, Ack: 230, Len: 0

No. Time Source Destination Protocol Info 137 2015-03-16 14:34:39.150661000 192.168.2.231 192.168.2.77 TCP 35351 > commplex-link [ACK] Seq=230 Ack=2 Win=5840 Len=0

Frame 137: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface 0 Ethernet II, Src: Vmware_e7:f2:00 (00:0c:29:e7:f2:00), Dst: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84) Internet Protocol Version 4, Src: 192.168.2.231 (192.168.2.231), Dst: 192.168.2.77 (192.168.2.77) Transmission Control Protocol, Src Port: 35351 (35351), Dst Port: commplex-link (5001), Seq: 230, Ack: 2, Len: 0

No. Time Source Destination Protocol Info 3176 2015-03-16 14:51:25.356426000 0.0.0.0 255.255.255.255 DHCP DHCP Discover - Transaction ID 0x47033129

Frame 3176: 304 bytes on wire (2432 bits), 304 bytes captured (2432 bits) on interface 0 Ethernet II, Src: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84), Dst: Broadcast (ff:ff:ff:ff:ff:ff) Internet Protocol Version 4, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255) User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67) Bootstrap Protocol

No. Time Source Destination Protocol Info 3178 2015-03-16 14:51:25.359860000 192.168.2.1 192.168.2.77 DHCP DHCP Offer - Transaction ID 0x47033129

Frame 3178: 342 bytes on wire (2736 bits), 342 bytes captured (2736 bits) on interface 0 Ethernet II, Src: Apple_29:bc:ca (88:1f:a1:29:bc:ca), Dst: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84) Internet Protocol Version 4, Src: 192.168.2.1 (192.168.2.1), Dst: 192.168.2.77 (192.168.2.77) User Datagram Protocol, Src Port: bootps (67), Dst Port: bootpc (68) Bootstrap Protocol

No. Time Source Destination Protocol Info 3179 2015-03-16 14:51:25.366107000 0.0.0.0 255.255.255.255 DHCP DHCP Request - Transaction ID 0x47033129

Frame 3179: 307 bytes on wire (2456 bits), 307 bytes captured (2456 bits) on interface 0 Ethernet II, Src: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84), Dst: Broadcast (ff:ff:ff:ff:ff:ff) Internet Protocol Version 4, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255) User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67) Bootstrap Protocol

No. Time Source Destination Protocol Info 3181 2015-03-16 14:51:25.369484000 192.168.2.1 192.168.2.77 DHCP DHCP ACK - Transaction ID 0x47033129

Frame 3181: 350 bytes on wire (2800 bits), 350 bytes captured (2800 bits) on interface 0 Ethernet II, Src: Apple_29:bc:ca (88:1f:a1:29:bc:ca), Dst: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84) Internet Protocol Version 4, Src: 192.168.2.1 (192.168.2.1), Dst: 192.168.2.77 (192.168.2.77) User Datagram Protocol, Src Port: bootps (67), Dst Port: bootpc (68) Bootstrap Protocol

No. Time Source Destination Protocol Info 3182 2015-03-16 14:51:25.375766000 c0:b1:3c:83:83:84 Broadcast ARP Gratuitous ARP for 192.168.2.77 (Request)

Frame 3182: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface 0 Ethernet II, Src: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84), Dst: Broadcast (ff:ff:ff:ff:ff:ff) Address Resolution Protocol (request/gratuitous ARP)

No. Time Source Destination Protocol Info 3217 2015-03-16 14:51:31.304158000 c0:b1:3c:83:83:84 Vmware_e7:f2:00 ARP 192.168.2.77 is at c0:b1:3c:83:83:84

Frame 3217: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface 0 Ethernet II, Src: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84), Dst: Vmware_e7:f2:00 (00:0c:29:e7:f2:00) Address Resolution Protocol (reply)

No. Time Source Destination Protocol Info 3218 2015-03-16 14:51:31.304340000 192.168.2.231 192.168.2.77 TCP 36774 > commplex-link [SYN] Seq=0 Win=5840 Len=0 MSS=1460 SACK_PERM=1 TSval=4268886 TSecr=0 WS=64

Frame 3218: 74 bytes on wire (592 bits), 74 bytes captured (592 bits) on interface 0 Ethernet II, Src: Vmware_e7:f2:00 (00:0c:29:e7:f2:00), Dst: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84) Internet Protocol Version 4, Src: 192.168.2.231 (192.168.2.231), Dst: 192.168.2.77 (192.168.2.77) Transmission Control Protocol, Src Port: 36774 (36774), Dst Port: commplex-link (5001), Seq: 0, Len: 0

No. Time Source Destination Protocol Info 3219 2015-03-16 14:51:31.320392000 192.168.2.77 192.168.2.231 TCP commplex-link > 36774 [SYN, ACK] Seq=0 Ack=1 Win=1460 Len=0 MSS=1460

Frame 3219: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface 0 Ethernet II, Src: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84), Dst: Vmware_e7:f2:00 (00:0c:29:e7:f2:00) Internet Protocol Version 4, Src: 192.168.2.77 (192.168.2.77), Dst: 192.168.2.231 (192.168.2.231) Transmission Control Protocol, Src Port: commplex-link (5001), Dst Port: 36774 (36774), Seq: 0, Ack: 1, Len: 0

No. Time Source Destination Protocol Info 3220 2015-03-16 14:51:31.320682000 192.168.2.231 192.168.2.77 TCP 36774 > commplex-link [ACK] Seq=1 Ack=1 Win=5840 Len=0

Frame 3220: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface 0 Ethernet II, Src: Vmware_e7:f2:00 (00:0c:29:e7:f2:00), Dst: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84) Internet Protocol Version 4, Src: 192.168.2.231 (192.168.2.231), Dst: 192.168.2.77 (192.168.2.77) Transmission Control Protocol, Src Port: 36774 (36774), Dst Port: commplex-link (5001), Seq: 1, Ack: 1, Len: 0

No. Time Source Destination Protocol Info 3221 2015-03-16 14:51:31.320781000 192.168.2.231 192.168.2.77 TCP 36774 > commplex-link [PSH, ACK] Seq=1 Ack=1 Win=5840 Len=76

Frame 3221: 130 bytes on wire (1040 bits), 130 bytes captured (1040 bits) on interface 0 Ethernet II, Src: Vmware_e7:f2:00 (00:0c:29:e7:f2:00), Dst: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84) Internet Protocol Version 4, Src: 192.168.2.231 (192.168.2.231), Dst: 192.168.2.77 (192.168.2.77) Transmission Control Protocol, Src Port: 36774 (36774), Dst Port: commplex-link (5001), Seq: 1, Ack: 1, Len: 76 Data (76 bytes)

0000 77 00 00 00 01 00 00 00 08 00 00 00 32 00 00 00 w...........2... 0010 c9 f5 6d 00 b0 de 70 00 34 f3 6d 00 01 00 00 00 ..m...p.4.m..... 0020 c4 df 6f 00 5c 9b c4 bf 98 ea 6f 00 b0 9a c4 bf ..o......o..... 0030 28 8d 6e 00 a0 9a c4 bf 34 f3 6d 00 94 9a c4 bf (.n.....4.m..... 0040 3c ea 6f 00 00 00 00 00 00 39 7f b7 <.o......9..

No. Time Source Destination Protocol Info 3222 2015-03-16 14:51:31.320863000 192.168.2.231 192.168.2.77 TCP 36774 > commplex-link [FIN, PSH, ACK] Seq=77 Ack=1 Win=5840 Len=152

Frame 3222: 206 bytes on wire (1648 bits), 206 bytes captured (1648 bits) on interface 0 Ethernet II, Src: Vmware_e7:f2:00 (00:0c:29:e7:f2:00), Dst: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84) Internet Protocol Version 4, Src: 192.168.2.231 (192.168.2.231), Dst: 192.168.2.77 (192.168.2.77) Transmission Control Protocol, Src Port: 36774 (36774), Dst Port: commplex-link (5001), Seq: 77, Ack: 1, Len: 152 Data (152 bytes)

0000 77 00 00 00 01 00 00 00 08 00 00 00 32 00 00 00 w...........2... 0010 c9 f5 6d 00 b0 de 70 00 34 f3 6d 00 01 00 00 00 ..m...p.4.m..... 0020 c4 df 6f 00 5c 9b c4 bf 98 ea 6f 00 b0 9a c4 bf ..o......o..... 0030 28 8d 6e 00 a0 9a c4 bf 34 f3 6d 00 94 9a c4 bf (.n.....4.m..... 0040 3c ea 6f 00 00 00 00 00 00 39 7f b7 77 00 00 00 <.o......9..w... 0050 01 00 00 00 08 00 00 00 32 00 00 00 c9 f5 6d 00 ........2.....m. 0060 b0 de 70 00 34 f3 6d 00 01 00 00 00 c4 df 6f 00 ..p.4.m.......o. 0070 5c 9b c4 bf 98 ea 6f 00 b0 9a c4 bf 28 8d 6e 00 .....o.....(.n. 0080 a0 9a c4 bf 34 f3 6d 00 94 9a c4 bf 3c ea 6f 00 ....4.m.....<.o. 0090 00 00 00 00 00 39 7f b7 .....9..

No. Time Source Destination Protocol Info 3223 2015-03-16 14:51:31.332094000 192.168.2.77 192.168.2.231 TCP commplex-link > 36774 [ACK] Seq=1 Ack=77 Win=1460 Len=0

Frame 3223: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface 0 Ethernet II, Src: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84), Dst: Vmware_e7:f2:00 (00:0c:29:e7:f2:00) Internet Protocol Version 4, Src: 192.168.2.77 (192.168.2.77), Dst: 192.168.2.231 (192.168.2.231) Transmission Control Protocol, Src Port: commplex-link (5001), Dst Port: 36774 (36774), Seq: 1, Ack: 77, Len: 0

No. Time Source Destination Protocol Info 3224 2015-03-16 14:51:31.337767000 192.168.2.77 192.168.2.231 TCP commplex-link > 36774 [FIN, ACK] Seq=1 Ack=230 Win=1460 Len=0

Frame 3224: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface 0 Ethernet II, Src: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84), Dst: Vmware_e7:f2:00 (00:0c:29:e7:f2:00) Internet Protocol Version 4, Src: 192.168.2.77 (192.168.2.77), Dst: 192.168.2.231 (192.168.2.231) Transmission Control Protocol, Src Port: commplex-link (5001), Dst Port: 36774 (36774), Seq: 1, Ack: 230, Len: 0

No. Time Source Destination Protocol Info 3225 2015-03-16 14:51:31.338051000 192.168.2.231 192.168.2.77 TCP 36774 > commplex-link [ACK] Seq=230 Ack=2 Win=5840 Len=0

Frame 3225: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface 0 Ethernet II, Src: Vmware_e7:f2:00 (00:0c:29:e7:f2:00), Dst: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84) Internet Protocol Version 4, Src: 192.168.2.231 (192.168.2.231), Dst: 192.168.2.77 (192.168.2.77) Transmission Control Protocol, Src Port: 36774 (36774), Dst Port: commplex-link (5001), Seq: 230, Ack: 2, Len: 0

No. Time Source Destination Protocol Info 3260 2015-03-16 14:51:46.974398000 c0:b1:3c:83:83:84 Broadcast ARP Gratuitous ARP for 192.168.2.77 (Request)

Frame 3260: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface 0 Ethernet II, Src: c0:b1:3c:83:83:84 (c0:b1:3c:83:83:84), Dst: Broadcast (ff:ff:ff:ff:ff:ff) Address Resolution Protocol (request/gratuitous ARP)

You seem to have got a long way - which is good - we will of course do what we can to assist but I will need a little time. It would be great to get your project in the FreeRTOS interactive site when it is all working (just the FreeRTOS+TCP bit - not your application code that is using the TCP stack!). Regarding your question:

Best I can figure is i might need to setup an event group? FreeRTOS_accept seems to be waiting in xEventGroupWaitBits, but I only have a single server trying to listen on a single port. Any help is appreciated.

The event groups are used to communicate between sockets and the task that runs the IP stack - it is all internal to the stack so you don't need to create event groups yourself.

Regards.

Did you forget to attach the wireshark capture?

The wireshark output is the bulk of the initial post, but I suspect you wanted a cap file ... Attached is an equivalent cap from today

Greg

New Information, I did get the application to work properly, but I needed to change the block time to zero. There appears to be a issue with nonzero wait times to FreeRTOSaccept. The connection is only checked for once at the entrance to FreeRTOSaccept. Small numbers work and if the code loops accept will will return the socket after the timeout value.

Greg

Hi Greg,

Great that you found a way to get it working.

As you saw the connection is made and closed very quickly. Your TCP client has sent 76 + 152 bytes and along with the second packet, it sends the FIN flag. The entire connection only lasts 38 ms.

Could you drop an email to Richard ( see http://www.freertos.org/contact ) and you will receive the latest +TCP release. Some minor things have changed about the server sockets.

Regards, Hein

Hi Greg,

My application uses an 'infinite', i.e. portMAX_DELAY, timeout on the listening socket on which FreeRTOS_accept() waits. When a connection is made and the client socket is returned by FreeRTOS_accept(), I set finite timeouts (a few hundred milliseconds) for both send and receive for that socket, and this seems to work. I haven't explored finding optimal values for these.

I am using a later version (150114) of +TCP than is publicly downloadable from the FreeRTOS site.

My simple demo is here (includes the slightly modified +TCP-150114): http://interactive.freertos.org/entries/80118239-FreeRTOS-TCP-Labs-port-and-demo-for-Embedded-Artists-LPC4088-Dev-Kit

Regards,

Andy McC