[lwip-users] FIN ACK with data. Not collecting the data

[Will Tucker]

Hi,

I have a RAW TCP/IP connection Via PPP where I'm
sending a Sensor reading to a HTTP server and getting
a HTTP reply back (ACK). 

Well I can send the HTTP sensor reading and the HTTP
server sends me back a reply but some how lwip is not
picking up the data that is attached to the servers
FIN ACK 

See below.
Any Ideas Why?

Thanks 

Will


******************SENT: GLUCOSE READING***************

tcp_output_segment: 6512:6667
ip_output_if:   0
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |       195     | (v, hl, tos, len)
+-------------------------------+
|        1      |010|       0   | (id, flags, offset)
+-------------------------------+
|  255  |    6  |    0x83fb     | (ttl, proto, chksum)
+-------------------------------+
|   67  |    4  |   70  |  202  | (src)
+-------------------------------+
|   67  |   45  |   42  |   66  | (dest)
+-------------------------------+
netif->output()netif: send ptr 0012EFB8 q->payload
0042BB96 q->len 40 q->next 00
4318AC
netif: send ptr 0012EFE0 q->payload 00434288 q->len
155 q->next 00000000
tcp_output: nothing to send (00000000)
netif: recv length 41 p->tot_len 41
netif: recv start 0 length 41 q->payload 0042E3A0
q->len 41 q->next 00000000
ip_input: iphdr->dest 0xca460443 netif->ip_addr
0xca460443 (0x460443, 0x460443,
0xca000000)
ip_input: packet accepted on interface
ip_input:
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
+-------------------------------+
|    22335      |010|       0   | (id, flags, offset)
+-------------------------------+
|  122  |    6  |    0xb258     | (ttl, proto, chksum)
+-------------------------------+
|   67  |   45  |   42  |   66  | (src)
+-------------------------------+
|   67  |    4  |   70  |  202  | (dest)
+-------------------------------+
ip_input: p->len 40 p->tot_len 40
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags
-+-+-+-+-+-+-+-+-+-+-+-+-+-+
tcp_receive: ACK for 6667, unacked->seqno 6512:6667
tcp_receive: removing 6512:6667 from pcb->unacked
tcp_output: nothing to send (00000000)
tcp_output: nothing to send (00000000)
netif: recv length 218 p->tot_len 218
netif: recv start 0 length 218 q->payload 0042E3A0
q->len 218 q->next 00000000
ip_input: iphdr->dest 0xca460443 netif->ip_addr
0xca460443 (0x460443, 0x460443,
0xca000000)
ip_input: packet accepted on interface
ip_input:
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |       217     | (v, hl, tos, len)
+-------------------------------+
|    22502      |010|       0   | (id, flags, offset)
+-------------------------------+
|  122  |    6  |    0xb100     | (ttl, proto, chksum)
+-------------------------------+
|   67  |   45  |   42  |   66  | (src)
+-------------------------------+
|   67  |    4  |   70  |  202  | (dest)
+-------------------------------+
ip_input: p->len 217 p->tot_len 217
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags
-+-+-+-+-+-+-+-+-+-+-+-+-+-+
tcp_enqueue(pcb=00431AFC, arg=00000000, len=0,
flags=1, copy=1)
tcp_enqueue: queueing 6667:6668 (0x1)
tcp_output_segment: 6667:6667
ip_output_if:   0
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
+-------------------------------+
|        2      |010|       0   | (id, flags, offset)
+-------------------------------+
|  255  |    6  |    0x8495     | (ttl, proto, chksum)
+-------------------------------+
|   67  |    4  |   70  |  202  | (src)
+-------------------------------+
|   67  |   45  |   42  |   66  | (dest)
+-------------------------------+
netif->output()netif: send ptr 0012E70C q->payload
0042BB96 q->len 40 q->next 00
000000
tcp_output: nothing to send (00000000)
tcp_output: nothing to send (00000000)
netif: recv length 56 p->tot_len 56
netif: recv start 0 length 56 q->payload 0042E3A0
q->len 56 q->next 00000000
ip_input: iphdr->dest 0xca460443 netif->ip_addr
0xca460443 (0x460443, 0x460443,
0xca000000)
ip_input: packet accepted on interface
ip_input:
IP header:

<****THIS IS THE PACKET WITH THE DATA****>

+-------------------------------+
| 4 | 5 |  0x00 |        55     | (v, hl, tos, len)
+-------------------------------+
|    22503      |010|       0   | (id, flags, offset)
+-------------------------------+
|  122  |    6  |    0xb1a1     | (ttl, proto, chksum)
+-------------------------------+
|   67  |   45  |   42  |   66  | (src)
+-------------------------------+
|   67  |    4  |   70  |  202  | (dest)
+-------------------------------+
ip_input: p->len 55 p->tot_len 55
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags
-+-+-+-+-+-+-+-+-+-+-+-+-+-+
tcp_receive: received FIN.
tcp_output: sending ACK for 4102618528
ip_output_if:   0
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
+-------------------------------+
|        3      |010|       0   | (id, flags, offset)
+-------------------------------+
|  255  |    6  |    0x8494     | (ttl, proto, chksum)
+-------------------------------+
|   67  |    4  |   70  |  202  | (src)
+-------------------------------+
|   67  |   45  |   42  |   66  | (dest)
+-------------------------------+
netif->output()netif: send ptr 0012F0B0 q->payload
0042BBE4 q->len 40 q->next 00
000000
tcp_output: nothing to send (00000000)
netif: recv length 41 p->tot_len 41
netif: recv start 0 length 41 q->payload 0042E3A0
q->len 41 q->next 00000000
ip_input: iphdr->dest 0xca460443 netif->ip_addr
0xca460443 (0x460443, 0x460443,
0xca000000)
ip_input: packet accepted on interface
ip_input:
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
+-------------------------------+
|    22505      |010|       0   | (id, flags, offset)
+-------------------------------+
|  122  |    6  |    0xb1ae     | (ttl, proto, chksum)
+-------------------------------+
|   67  |   45  |   42  |   66  | (src)
+-------------------------------+
|   67  |    4  |   70  |  202  | (dest)
+-------------------------------+
ip_input: p->len 40 p->tot_len 40
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags
-+-+-+-+-+-+-+-+-+-+-+-+-+-+
tcp_receive: ACK for 6668, unacked->seqno 6667:6668
tcp_receive: removing 6667:6668 from pcb->unacked
tcp_output: sending ACK for 4102618528
ip_output_if:   0
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
+-------------------------------+
|        4      |010|       0   | (id, flags, offset)
+-------------------------------+
|  255  |    6  |    0x8493     | (ttl, proto, chksum)
+-------------------------------+
|   67  |    4  |   70  |  202  | (src)
+-------------------------------+
|   67  |   45  |   42  |   66  | (dest)
+-------------------------------+
netif->output()netif: send ptr 0012F0B0 q->payload
0042BB96 q->len 40 q->next 00
000000


=====
Will Tucker
address@hidden
303-773-3056
303-668-8822 Cell