GPRS复用拨号失败

wan_zilove

将SIM300模块通过GSM0710协议复用后再使用pppd拨号经常拨不成功。


异常信息大概有以下几种：

1.  script connect failure

2.  sent   [LCP   ConfReq   id=0x1   <mru   xxx>   <magic   xxx>]  
     LCP:   timeout   sending   Config-Requests

3. modem能正常返回AT命令，不返回LCP请求。

其中1、2两种情况pppd拨号多次后可能恢复正常，第3种异常只能将modem手动复位。



pppd程序未使用gsm0710复用之前用物理串口拨通概率大概是95%以上。复用后大概在50%，而且还有modem假死的情况。


有大虾遇到类似的情况吗？请分享一下经验啊

emmoblin

这个可能你需要跟踪一下ppp的驱动。
或者在pppd中添加打印，看看驱动中的ppp包是否传到了pppd中

wan_zilove

需要将modem的回显关闭。pppd脚本中的拨号命令回显会和应答包重叠在一起，导致gsm0710程序不能正常的解析到数据包。

wan_zilove

使用的pppd脚本：

#!bin/bash
while true;
do
rm -rf /tmp/gprs.tmp

echo "
# Tell the ppp-daemon to accept mangled data
receive-all
# Give some debug info
debug
kdebug 7
# Print out all the option values which have been set.
#dump
#/dev/ttyS0
/dev/mux0
115200
#-crtscts  # With RTS/CTS
nocrtscts  # WO/  RTS/CTS
# Ignore carrier detect signal from the modem
local
# To keep pppd on the terminal
nodetach
# Accept the peer's idea of our local IP address
ipcp-accept-local
# Accept the peer's idea of its (remote) IP address
ipcp-accept-remote
0.0.0.0:0.0.0.0
-chap
# No ppp compression
novj
novjccomp
papcrypt
nodeflate
#No ppp magic number
nomagic
# no asyn cmap
asyncmap 0
# Add default route
defaultroute
# Connect script
connect /etc/ppp/connect-chat-gprs
# Disconnect script
disconnect /etc/ppp/disconnect-chat-gprs
" > /tmp/gprs.tmp
#read line < /tmp/ptsname ; echo $line >> /tmp/gprs.tmp
pppd file /tmp/gprs.tmp &
sleep 60
killall pppd
sleep 20
done

wan_zilove

运行：sh pppd.sh
终端输出：
Press CTRL-C to close the connection at any stage!
OK

OKChecking voltage...

OKChecking SIM card...

+CBC: 0,98,4180

OKCheck signal ...

460000330568572

OK
defining PDP context...

+CSQ: 29,0

OK

OK

OK

CONNECT
~
Serial connection established.
using channel 357
Using interface ppp0
Connect: ppp0 <--> /dev/mux0
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <pcomp> <accomp>]
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0xc9 <mru 1600> <auth pap> <magic 0xc3c65c9> <asyncmap 0x0> <pcomp> <accomp>]
sent [LCP ConfRej id=0xc9 <magic 0xc3c65c9>]
rcvd [LCP ConfReq id=0xca <mru 1600> <auth pap> <asyncmap 0x0> <pcomp> <accomp>]
sent [LCP ConfAck id=0xca <mru 1600> <auth pap> <asyncmap 0x0> <pcomp> <accomp>]
sent [LCP EchoReq id=0x0 magic=0x0]
sent [PAP AuthReq id=0x1 user="test-desktop" password=<hidden>]
rcvd [LCP EchoRep id=0x0 magic=0xc3c65c9]
rcvd [PAP AuthAck id=0x1 "TTP Com PPP - Password Verified OK"]
Remote message: TTP Com PPP - Password Verified OK
PAP authentication succeeded
sent [CCP ConfReq id=0x1 <bsd v1 15>]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0>]
rcvd [LCP ProtRej id=0x31 80 fd 01 01 00 07 15 03 2f 1c]
Protocol-Reject for 'Compression Control Protocol' (0x80fd) received
rcvd [IPCP ConfNak id=0x1 <addr 10.14.214.17> <ms-dns1 211.136.17.107> <ms-dns3 211.136.20.203>]
sent [IPCP ConfReq id=0x2 <addr 10.14.214.17>]
rcvd [IPCP ConfReq id=0x38 <addr 10.0.0.1>]
sent [IPCP ConfAck id=0x38 <addr 10.0.0.1>]
rcvd [IPCP ConfNak id=0x2 <ms-dns1 211.136.17.107> <ms-dns3 211.136.20.203>]
sent [IPCP ConfReq id=0x3 <addr 10.14.214.17>]
rcvd [IPCP ConfNak id=0x3 <ms-dns1 211.136.17.107> <ms-dns3 211.136.20.203>]
sent [IPCP ConfReq id=0x4 <addr 10.14.214.17>]
rcvd [IPCP ConfAck id=0x4 <addr 10.14.214.17>]
not replacing existing default route via 192.168.1.1
Cannot determine ethernet address for proxy ARP
local  IP address 10.14.214.17
remote IP address 10.0.0.1
Script /etc/ppp/ip-up started (pid 6923)
Script /etc/ppp/ip-up finished (pid 6923), status = 0x0
Terminating on signal 15
Connect time 0.9 minutes.
Sent 0 bytes, received 0 bytes.
Script /etc/ppp/ip-down started (pid 6940)
sent [LCP TermReq id=0x2 "User request"]
rcvd [LCP TermAck id=0x2]
Connection terminated.

Sending break to the modem

PDP context detached
Serial link disconnected.
Script /etc/ppp/ip-down finished (pid 6940), status = 0x0
Press CTRL-C to close the connection at any stage!
OK

OKChecking voltage...

OKChecking SIM card...

+CBC: 0,98,4176

OKCheck signal ...

460000330568572

OK
defining PDP context...

+CSQ: 29,0

OK

OK

OK

CONNECT
~
Serial connection established.
using channel 358
Using interface ppp0
Connect: ppp0 <--> /dev/mux0
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <pcomp> <accomp>]
rcvd [LCP]
rcvd [LCP]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <pcomp> <accomp>]
rcvd [LCP]
rcvd [LCP]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <pcomp> <accomp>]
rcvd [LCP]
rcvd [LCP]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <pcomp> <accomp>]
rcvd [LCP]
rcvd [LCP]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <pcomp> <accomp>]
rcvd [LCP]
rcvd [LCP]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <pcomp> <accomp>]
rcvd [LCP]
rcvd [LCP]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <pcomp> <accomp>]
rcvd [LCP]
rcvd [LCP]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <pcomp> <accomp>]
rcvd [LCP]
rcvd [LCP]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <pcomp> <accomp>]
rcvd [LCP]
rcvd [LCP]
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <pcomp> <accomp>]
rcvd [LCP]
LCP: timeout sending Config-Requests
Connection terminated.

Sending break to the modem

PDP context detached
Serial link disconnected.
Modem hangup
pppd: no process killed

wan_zilove

其中上半部为成功的pppd拨号，在连续随机几十次pppd成功拨号后，GPRS开始出现异常（即下半部rcvd [LCP]开始接收不到数据），最终出现LCP: timeout sending Config-Requests。之后不论怎么人工重启进程均出现此异常，除非手工复位GPRS设备。


实在搞不懂了，请大虾帮忙