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Re: [lwip-users] netconn_recv partial data

From: N.Karakotas
Subject: Re: [lwip-users] netconn_recv partial data
Date: Sat, 21 Jan 2012 13:20:02 +0200
Hi,
 
I did some mods to my lwipopts.h and changed my eth driver:
 
p = pbuf_alloc(PBUF_RAW, size, PBUF_POOL);
 
to:
 
p = pbuf_alloc(PBUF_RAW, size, PBUF_RAM);
 
I also connected the IP cam directly to my hardware to make sure there isnt any funny stuff caused by my router. Running the following code without DEBUG ON, len was equal to  226637 which is correct as reported at the header response.
 
if(resp == ERR_OK){
        memset(httpBuf,0,BUF_SIZE);
        netconn_set_recvtimeout(conn,5000 );    // timeout on 5 secs
        while((resp = netconn_recv(conn,&inbuf)) == ERR_OK){
            netbuf_first(inbuf);
            do{
                netbuf_data(inbuf, (void*)&data, &buflen);
                len += buflen;
            }while(netbuf_next(inbuf) >= 0);
 
            netbuf_delete(inbuf);
        }
 
        printf("%d\r\n",len);
 
    }
 
 
Regards,
Nick
 
 
Sent: Saturday, January 21, 2012 12:35 AM
Subject: Re: [lwip-users] netconn_recv partial data
 
Hi,
 
Here is the debug output. Is data coming in faster than im processing?
 
netif_set_ipaddr: netif address being changed
netif: IP address of interface 192.168.5.16
netif: netmask of interface 255.255.255.0
netif: GW address of interface 192.168.5.1
netif: added interface em IP addr 192.168.5.16 netmask 255.255.255.0 gw 192.168.5.1
tcpip_thread: PACKET 0x10001530
tcpip_thread: PACKET 0x100014f0
tcpip_thread: PACKET 0x10001530
ip_input: iphdr->dest 0x1005a8c0 netif->ip_addr 0x1005a8c0 (0x5a8c0, 0x5a8c0, 0x10000000)
ip_input: packet not for us.
ip_route: No route to 192.168.5.16
ip_forward: no forwarding route for 192.168.5.16 found
tcpip_thread: PACKET 0x100014f0
netif: setting default interface em
tcpip_thread: PACKET 0x100014f0
tcpip_thread: PACKET 0x10001530
tcpip_thread: PACKET 0x100014b0
tcpip_thread: PACKET 0x100014f0
tcpip_thread: API message 0x1000410c
tcpip_thread: PACKET 0x100014f0
tcpip_thread: API message 0x1000410c
tcp_bind: bind to port 8080
tcpip_thread: API message 0x1000410c
tcpip_thread: PACKET 0x100014f0
tcpip_thread: API message 0x100040dc
netif_find: found em
tcpip_thread: API message 0x10004094
tcp_bind: bind to port 49153
tcpip_thread: API message 0x10004094
tcp_connect to port 80
inet_chksum_pseudo(): checksumming pbuf 0x10005b58 (has next 0x0)
inet_chksum_pseudo(): pbuf chain lwip_chksum()=a7d7
ip_output_if: em0
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        44     | (v, hl, tos, len)
+-------------------------------+
|        0      |000|       0   | (id, flags, offset)
+-------------------------------+
|  255  |    6  |    0x3008     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |    5  |   16  | (src)
+-------------------------------+
|  192  |  168  |    5  |   99  | (dest)
+-------------------------------+
netif->output()tcpip_thread: PACKET 0x100014f0
tcpip_thread: PACKET 0x100014b0
tcpip_thread: PACKET 0x10001530
tcpip_thread: PACKET 0x10001470
tcpip_thread: PACKET 0x10001430
ip_input: iphdr->dest 0x1005a8c0 netif->ip_addr 0x1005a8c0 (0x5a8c0, 0x5a8c0, 0x10000000)
ip_input: packet accepted on interface em
ip_input:
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
+-------------------------------+
|    37013      |010|       0   | (id, flags, offset)
+-------------------------------+
|   64  |    6  |    0x1e77     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |    5  |   99  | (src)
+-------------------------------+
|  192  |  168  |    5  |   16  | (dest)
+-------------------------------+
ip_input: p->len 40 p->tot_len 40
TCP header:
+-------------------------------+
|       80      |    49153      | (src port, dest port)
+-------------------------------+
|           2333605984          | (seq no)
+-------------------------------+
|           0000006624          | (ack no)
+-------------------------------+
|  5 |   |010000|      5840     | (hdrlen, flags (ACK
), win)
+-------------------------------+
|    0xa796     |         0     | (chksum, urgp)
+-------------------------------+
inet_chksum_pseudo(): checksumming pbuf 0x100026a8 (has next 0x0)
inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK
-+-+-+-+-+-+-+-+-+-+-+-+-+-+
State: SYN_SENT
SYN-SENT: ackno 6624 pcb->snd_nxt 6510 unacked 6509
inet_chksum_pseudo(): checksumming pbuf 0x10005bac (has next 0x0)
inet_chksum_pseudo(): pbuf chain lwip_chksum()=9d49
ip_output_if: em0
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
+-------------------------------+
|        1      |000|       0   | (id, flags, offset)
+-------------------------------+
|  255  |    6  |    0x300b     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |    5  |   16  | (src)
+-------------------------------+
|  192  |  168  |    5  |   99  | (dest)
+-------------------------------+
netif->output()State: SYN_SENT
tcpip_thread: PACKET 0x100014f0
tcpip_thread: PACKET 0x10001470
tcpip_thread: PACKET 0x10001530
tcpip_thread: PACKET 0x100014b0
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x100013b0
tcpip_thread: PACKET 0x10001370
tcpip_thread: PACKET 0x10001430
tcpip_thread: PACKET 0x10001530
tcpip_thread: PACKET 0x10001470
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x100013f0
tcp_slowtmr: processing active pcb
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x10001470
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x10001470
tcpip_thread: PACKET 0x10001470
tcpip_thread: PACKET 0x100013f0
tcp_slowtmr: processing active pcb
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x10001470
tcpip_thread: PACKET 0x10001470
tcp_slowtmr: processing active pcb
tcpip_thread: PACKET 0x10001470
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x10001470
tcpip_thread: PACKET 0x100013f0
tcp_slowtmr: processing active pcb
tcp_slowtmr: polling application
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x100013f0
tcp_slowtmr: processing active pcb
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x10001470
tcp_slowtmr: processing active pcb
inet_chksum_pseudo(): checksumming pbuf 0x10005b58 (has next 0x0)
inet_chksum_pseudo(): pbuf chain lwip_chksum()=a7d7
ip_output_if: em0
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        44     | (v, hl, tos, len)
+-------------------------------+
|        2      |000|       0   | (id, flags, offset)
+-------------------------------+
|  255  |    6  |    0x3006     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |    5  |   16  | (src)
+-------------------------------+
|  192  |  168  |    5  |   99  | (dest)
+-------------------------------+
netif->output()tcpip_thread: PACKET 0x10001470
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x10001530
tcpip_thread: PACKET 0x10001430
tcpip_thread: PACKET 0x10001370
ip_input: iphdr->dest 0x1005a8c0 netif->ip_addr 0x1005a8c0 (0x5a8c0, 0x5a8c0, 0x10000000)
ip_input: packet accepted on interface em
ip_input:
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        44     | (v, hl, tos, len)
+-------------------------------+
|        0      |010|       0   | (id, flags, offset)
+-------------------------------+
|   64  |    6  |    0xaf08     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |    5  |   99  | (src)
+-------------------------------+
|  192  |  168  |    5  |   16  | (dest)
+-------------------------------+
ip_input: p->len 44 p->tot_len 44
TCP header:
+-------------------------------+
|       80      |    49153      | (src port, dest port)
+-------------------------------+
|           2823389896          | (seq no)
+-------------------------------+
|           0000006510          | (ack no)
+-------------------------------+
|  6 |   |010010|      5840     | (hdrlen, flags (SYN ACK
), win)
+-------------------------------+
|    0xf0b0     |         0     | (chksum, urgp)
+-------------------------------+
inet_chksum_pseudo(): checksumming pbuf 0x10001f94 (has next 0x0)
inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags SYN ACK
-+-+-+-+-+-+-+-+-+-+-+-+-+-+
State: SYN_SENT
tcp_parseopt: MSS
SYN-SENT: ackno 6510 pcb->snd_nxt 6510 unacked 6509
inet_chksum_pseudo(): checksumming pbuf 0x10005b58 (has next 0x0)
inet_chksum_pseudo(): pbuf chain lwip_chksum()=c1e8
ip_output_if: em0
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
+-------------------------------+
|        3      |000|       0   | (id, flags, offset)
+-------------------------------+
|  255  |    6  |    0x3009     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |    5  |   16  | (src)
+-------------------------------+
|  192  |  168  |    5  |   99  | (dest)
+-------------------------------+
netif->output()State: ESTABLISHED
tcpip_thread: PACKET 0x10001530
tcpip_thread: PACKET 0x10001430
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x10001470
tcpip_thread: PACKET 0x100013b0
tcpip_thread: PACKET 0x100014b0
tcpip_thread: PACKET 0x100014f0
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x10001430
tcpip_thread: PACKET 0x100014b0
tcpip_thread: API message 0x10004094
inet_chksum_pseudo(): checksumming pbuf 0x10005b58 (has next 0x0)
inet_chksum_pseudo(): pbuf chain lwip_chksum()=c232
ip_output_if: em0
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |       154     | (v, hl, tos, len)
+-------------------------------+
|        4      |000|       0   | (id, flags, offset)
+-------------------------------+
|  255  |    6  |    0x2f96     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |    5  |   16  | (src)
+-------------------------------+
|  192  |  168  |    5  |   99  | (dest)
+-------------------------------+
netif->output()tcpip_thread: PACKET 0x100014b0
tcpip_thread: PACKET 0x10001430
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x100014f0
ip_input: iphdr->dest 0x1005a8c0 netif->ip_addr 0x1005a8c0 (0x5a8c0, 0x5a8c0, 0x10000000)
ip_input: packet accepted on interface em
ip_input:
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
+-------------------------------+
|    39996      |010|       0   | (id, flags, offset)
+-------------------------------+
|   64  |    6  |    0x12d0     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |    5  |   99  | (src)
+-------------------------------+
|  192  |  168  |    5  |   16  | (dest)
+-------------------------------+
ip_input: p->len 40 p->tot_len 40
TCP header:
+-------------------------------+
|       80      |    49153      | (src port, dest port)
+-------------------------------+
|           2823389897          | (seq no)
+-------------------------------+
|           0000006624          | (ack no)
+-------------------------------+
|  5 |   |010000|      5840     | (hdrlen, flags (ACK
), win)
+-------------------------------+
|    0x07fc     |         0     | (chksum, urgp)
+-------------------------------+
inet_chksum_pseudo(): checksumming pbuf 0x10002dbc (has next 0x0)
inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK
-+-+-+-+-+-+-+-+-+-+-+-+-+-+
State: ESTABLISHED
tcp_receive: ACK for 6624, unacked->seqno 6510:6624
tcp_receive: removing 6510:6624 from pcb->unacked
State: ESTABLISHED
tcpip_thread: PACKET 0x100013b0
ip_input: iphdr->dest 0x1005a8c0 netif->ip_addr 0x1005a8c0 (0x5a8c0, 0x5a8c0, 0x10000000)
ip_input: packet accepted on interface em
ip_input:
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |       305     | (v, hl, tos, len)
+-------------------------------+
|    39997      |010|       0   | (id, flags, offset)
+-------------------------------+
|   64  |    6  |    0x11c6     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |    5  |   99  | (src)
+-------------------------------+
|  192  |  168  |    5  |   16  | (dest)
+-------------------------------+
ip_input: p->len 305 p->tot_len 305
TCP header:
+-------------------------------+
|       80      |    49153      | (src port, dest port)
+-------------------------------+
|           2823389897          | (seq no)
+-------------------------------+
|           0000006624          | (ack no)
+-------------------------------+
|  5 |   |011000|      5840     | (hdrlen, flags (PSH ACK
), win)
+-------------------------------+
|    0x1534     |         0     | (chksum, urgp)
+-------------------------------+
inet_chksum_pseudo(): checksumming pbuf 0x100021f0 (has next 0x0)
inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags PSH ACK
-+-+-+-+-+-+-+-+-+-+-+-+-+-+
State: ESTABLISHED
State: ESTABLISHED
tcpip_thread: PACKET 0x10001470
ip_input: iphdr->dest 0x1005a8c0 netif->ip_addr 0x1005a8c0 (0x5a8c0, 0x5a8c0, 0x10000000)
ip_input: packet accepted on interface em
ip_input:
IP header:
+-------------------------------+
| 4 | 5 |  0x00 |      1064     | (v, hl, tos, len)
+-------------------------------+
|    39998      |010|       0   | (id, flags, offset)
+-------------------------------+
|   64  |    6  |    0x0ece     | (ttl, proto, chksum)
+-------------------------------+
|  192  |  168  |    5  |   99  | (src)
+-------------------------------+
|  192  |  168  |    5  |   16  | (dest)
+-------------------------------+
ip_input: p->len 498 p->tot_len 1064
TCP header:
+-------------------------------+
|       80      |    49153      | (src port, dest port)
+-------------------------------+
|           2823390162          | (seq no)
+-------------------------------+
|           0000006624          | (ack no)
+-------------------------------+
|  5 |   |010000|      5840     | (hdrlen, flags (ACK
), win)
+-------------------------------+
|    0x693c     |         0     | (chksum, urgp)
+-------------------------------+
inet_chksum_pseudo(): checksumming pbuf 0x10003018 (has next 0x10002904)
inet_chksum_pseudo(): checksumming pbuf 0x10002904 (has next 0x10001f94)
inet_chksum_pseudo(): checksumming pbuf 0x10001f94 (has next 0x0)
inet_chksum_pseudo(): pbuf chain lwip_chksum()=4cc
inet_chksum_pseudo(): checksumming pbuf 0x10003018 (has next 0x10002904)
inet_chksum_pseudo(): checksumming pbuf 0x10002904 (has next 0x10001f94)
inet_chksum_pseudo(): checksumming pbuf 0x10001f94 (has next 0x0)
inet_chksum_pseudo(): pbuf chain lwip_chksum()=4cc
tcp_input: packet discarded due to failing checksum 0xfb33
TCP header:
+-------------------------------+
|       80      |    49153      | (src port, dest port)
+-------------------------------+
|           2823390162          | (seq no)
+-------------------------------+
|           0000006624          | (ack no)
+-------------------------------+
|  5 |   |010000|      5840     | (hdrlen, flags (ACK
), win)
+-------------------------------+
|    0x693c     |         0     | (chksum, urgp)
+-------------------------------+
tcpip_thread: PACKET 0x100013f0
tcpip_thread: PACKET 0x10001430
tcpip_thread: PACKET 0x100014b0
tcpip_thread: PACKET 0x100014f0
tcpip_thread: API message 0x100040b4
tcp_recved: recveived 265 bytes, wnd 2048 (0).
 
Sent: Saturday, January 21, 2012 12:00 AM
Subject: Re: [lwip-users] netconn_recv partial data
 
Hi,
 
The following code gets stuck on the second netconn_recv.
 
    resp = netconn_recv(conn,&inbuf) ;
    netbuf_data(inbuf, (void*)&data, &buflen);
    printf("%d\r\n",resp);
//    netbuf_next(inbuf);
    resp = netconn_recv(conn,&inbuf) ;
    netbuf_data(inbuf, (void*)&data, &buflen);
 
Nick

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