# http client over PPP skips request **URL:** \ **Category:** Rabbit\ **Created:** [November 1, 2011, 5:33pm UTC](https://forums.digi.com/t/http-client-over-ppp-skips-request/10654 "2011-11-01T17:33:13Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![gjr.wss](https://avatars.discourse-cdn.com/v4/letter/g/90db22/32.png) [@gjr.wss](https://forums.digi.com/u/gjr.wss)\ **Post date:** [November 1, 2011, 5:33pm UTC](https://forums.digi.com/t/http-client-over-ppp-skips-request/10654/1 "2011-11-01T17:33:13Z")
Hello, I’m working on a project with a RCM3700, DC 9.62 and a wavecom fasttrack modem on serial D. Approximately 6 out of 10 times I send a httpc\_get request it fails. In the logs it seems the only difference is the actual HTTP request is not being sent. I’ve been looking for a solution for about two weeks now, I put all the httpc and modem code in a separate test program to exclude all other factors. Down to 250 lines of code and still the same problem. I hope someone can help me get back on track. Besides extracting all the code I tried to replace these components: -SIM-card -Modem (about 6 different ones) -Rabbit -Rabbit-hold-board All combinations gave the same errors, so i’m quite sure the problem lies in the software. I have the following questions: 1 - Is there any more debug info I can turn on, I have PPP, PPPLINK and CHAT + \_VERBOSE and IFS\_DEBUG = 6. 2 - My predecessor had in the ifconfig for hangup “+++”. When i looked at the logging I noticed this gives 3 times “+++” on each up-down cycle. So I changed it to ATH, is this correct? 3 - What am I doing wrong that it doesnt work 100% of the time? Here is the outline of my program: Configure modem with AT: -Reset modem (AT+CFUN=1) -Check flow control (AT+IFC? must return 0,0) -Check character framing (AT+ICF? must return 3,4) -Set pin -Set CGDCONT (AT+CGDCONT? must return 1,“IP”,“internet”) When this is done I set up the IF\_PPP3 ```auto ifconfig(IF_PPP3, IFS_DEBUG, 6, IFS_PPP_SPEED, MODEM_SPEED, // = 38400L IFS_PPP_RTSPIN, PCDR, NULL, 0, IFS_PPP_CTSPIN, PCDR, 1, IFS_PPP_FLOWCONTROL, 0, IFS_PPP_SENDEXPECT, "'ATD *99***1#\r' 'CONNECT 38400'", IFS_PPP_HANGUP, "ATH", IFS_PPP_MODEMESCAPE, 1, IFS_PPP_ACCEPTIP, 1, IFS_PPP_ACCEPTDNS, 1, IFS_PPP_REMOTEAUTH, "username", "password", IFS_UP, IFS_END); ``` When the interface successfully came up I send the request: ```auto err = httpc_init_if (&hsock, &tsock, IF_PPP3); if (err) return err; err = httpc_get(&hsock, SERVER_IP_STR, SERVER_PORT, file, NULL); if (err) return err; err = httpc_skip_headers(&hsock, 0); if (err < 0) return err; // read body and close connection ``` The last function call, httpc\_skip\_headers() is where it goes wrong. The function returns -1 with the socket error: Remote peer reset connection A full piece of logging from a failed request: ```auto PPPLINK: sendpacket totlen=45 i/f 0 PPPLINK: sendpacket using 0000BCD8 --- pkt flags=x40 i/f=0 tstamp=31512 len=45 --- sect 1, len=45 addr=x80055A5A rlen=1481 21 45 00 00 2C 00 06 00 00 40 06 32 CA 5E 9D 48 !E , @ 2 ^ H A9 52 CC 4D EA 04 01 CC DC 11 B8 00 00 00 00 00 R M 00 60 02 08 00 65 94 00 00 02 04 05 B4 ` e PPPLINK: transmitter was idle PPPLINK: receive processed 1 chars PPPLINK: receive processed 48 chars PPP: got packet BCD8 on i/f:0 protocol:0x21 PPPLINK: sendpacket totlen=42 i/f 0 PPPLINK: sendpacket using 0000BCA1 --- pkt flags=x40 i/f=0 tstamp=15297 len=42 --- sect 1, len=41 addr=x80055464 rlen=1485 21 45 00 00 29 00 07 00 00 40 06 32 CC 5E 9D 48 !E ) @ 2 ^ H A9 52 CC 4D EA 04 01 CC DC 11 B8 00 01 01 91 05 R M B5 50 18 08 00 2E F2 00 00 P . sect 2, len=1 addr=x00051C64 rlen=0 47 G PPPLINK: transmitter was idle PPPLINK: receive processed 1 chars PPPLINK: receive processed 4 chars PPP: got packet BCD8 on i/f:0 protocol:0x21 error -1 calling httpc_skip_headers() Socket error:Remote peer reset connection ``` and finally a piece of logging from a successful request: ```auto PPPLINK: sendpacket totlen=45 i/f 0 PPPLINK: sendpacket using 0000BD0F --- pkt flags=x40 i/f=0 tstamp=5230 len=45 --- sect 1, len=45 addr=x80056050 rlen=1481 21 45 00 00 2C 00 01 00 00 40 06 C1 80 B2 E3 65 !E , @ e B1 52 CC 4D EA 04 00 CC DC FF 66 00 00 00 00 00 R M f 00 60 02 08 00 06 98 00 00 02 04 05 B4 ` PPPLINK: transmitter was idle PPPLINK: receive processed 1 chars PPPLINK: receive processed 18 chars PPP: got packet BD0F on i/f:0 protocol:0x21 PPPLINK: sendpacket totlen=133 i/f 0 PPPLINK: sendpacket using 0000BCD8 --- pkt flags=x40 i/f=0 tstamp=42230 len=133 --- sect 1, len=41 addr=x80055A5A rlen=1485 21 45 00 00 84 00 02 00 00 40 06 C1 27 B2 E3 65 !E @ ' e B1 52 CC 4D EA 04 00 CC DC FF 66 00 01 8A BD D8 R M f 56 50 18 08 00 93 F4 00 00 VP sect 2, len=92 addr=x00051C64 rlen=0 REQUEST PACKET CONTENTS PPPLINK: transmitter was idle PPPLINK: receive processed 1 chars PPPLINK: receive processed 100 chars PPPLINK: receive processed 112 chars PPP: got packet BD0F on i/f:0 protocol:0x21 PPPLINK: receive processed 65 chars PPP: got packet BCD8 on i/f:0 protocol:0x21 PPPLINK: sendpacket totlen=41 i/f 0 PPPLINK: sendpacket using 0000BCA1 --- pkt flags=x40 i/f=0 tstamp=42225 len=41 --- sect 1, len=41 addr=x80055464 rlen=1485 21 45 00 00 28 00 03 00 00 40 06 C1 82 B2 E3 65 !E ( @ e B1 52 CC 4D EA 04 00 CC DC FF 66 00 5D 8A BD D9 R M f ] 7D 50 10 06 EA BA C3 00 00 }P PPPLINK: transmitter was idle PPP: got packet BD0F on i/f:0 protocol:0x21 PPPLINK: sendpacket totlen=41 i/f 0 PPPLINK: sendpacket using 0000BCD8 --- pkt flags=x40 i/f=0 tstamp=47277 len=41 --- sect 1, len=41 addr=x80055A5A rlen=1485 21 45 00 00 28 00 04 00 00 40 06 C1 81 B2 E3 65 !E ( @ e B1 52 CC 4D EA 04 00 CC DC FF 66 00 5D 8A BD D9 R M f ] 7E 50 10 06 EA BA C2 00 00 ~P PPPLINK: transmitter was idle PPPLINK: sendpacket totlen=41 i/f 0 PPPLINK: sendpacket using 0000BD0F --- pkt flags=x40 i/f=0 tstamp=47288 len=41 --- sect 1, len=41 addr=x80056050 rlen=1485 21 45 00 00 28 00 05 00 00 40 06 C1 80 B2 E3 65 !E ( @ e B1 52 CC 4D EA 04 00 CC DC FF 66 00 5D 8A BD D9 R M f ] 7E 50 11 08 00 B9 AB 00 00 ~P PPPLINK: transmitter was idle PPPLINK: receive processed 1 chars PPPLINK: receive processed 45 chars PPP: got packet BD0F on i/f:0 protocol:0x21 Return data: XML ``` Last but not least I tried playing around with the following timeout-defines, but without any luck: ```auto #define DINBUFSIZE 255 #define DOUTBUFSIZE 255 #define URL_MAX_BUFFER_SIZE 1024 #define HTTP_MAX_BUFFER 1024 #define MAX_BUFFER_NET_SIZE 1024 #define MAXFORM_SIZE 64 #define TCP_OPENTIMEOUT 62000L // timeout for active opens #define TCP_CONNTIMEOUT 26000L // timeout during open or close negotiation #define TCP_SYNQTIMEOUT 180000L // timeout for pending connection #define TCP_TWTIMEOUT 4000L #define PSS_SENDBUF_SIZE 100 #define PPP_TIMEOUT 6000 #define CHAT_MAXLEN 60 #define CHAT_MAXSENDLEN 256 ``` Hopefully someone is able to see whats going wrong here. Thanks for reading. Kind regards, Gert-Jan edit 1 : typo edit 2 : Added concrete questions