Android 3G pppd debugging records.

Android 3G pppd debugging records.

1. Java Section
Android/development/data/etc/apns-conf_sdk.xml ---> system/etc/apns-conf.xml
Note the apns version,
<Apns version = "6">
<APN carrier = "China Unicom 3G network (China Unicom )"
APN = "3 GNET"
MCC = "460"
MNC = "01"
Proxy = ""
Port = ""
User = ""
Server = ""
Password = ""
Type = "default, supl"
/>
</Apns>

Android/packages/providers/telephonyprovider/src/COM/Android/providers/telephony/telephonyprovider. Java
File:
Public void oncreate (sqlitedatabase dB)
Created based on system/etc/apns-conf.xml
/Data/COM. Android. providers. telephony/databases/telephony. DB

Pppd depends on the APN provided by telephony when dialing.

2. drvier section.
My 3G module is Moto's htm1000, USB interface. The 3g driver is simply a USB-to-serial drive.
The module provides two tty devices, one for sending AT commands and the other for dialing pppd.

3. Part C.
CD Android/hardware/RIL/

3.1. Let's talk about rild/radiooptions. C first.
This is a test program,
Perror ("Usage: radiooptions [Option] [extra_socket_args]/n/
0-radio_reset,/n/
1-radio_off,/n/
2-unsol_network_state_change,/n/
3-qxdm_enable,/n/
4-qxdm_disable,/n/
5-radio_on,/n/
6 APN-setup_pdp APN,/n/
7-deactive_pdp,/n/
8 number-dial_call number,/n/
9-answer_call,/n/
10-end_call/N ");
}
It can be used to test the call.

Option 6 can be used to test pppd dialing.

3.2 rild/rild. c
If you have permission issues, you can directly modify init. RC to grant rild root permission.

The main function reads Android. RIL = from/proc/cmdline to determine the tty device name.
So you don't have to worry about it. Just write your own device name.
Arg_overrides [1] = "-d ";
Arg_overrides [2] = "/dev/ttymot1 ";

3.3 reference-RIL/reference-ril.c
For more information about the dialing process, see.
Asprintf (& cmd, "At + cgact = 0, % d", s_defultpdpcid );
Err = at_send_command (CMD, null );
Free (CMD );

Asprintf (& cmd, "At + cgdcont = % d,/" IP/",/" % S/", 0, 0", s_defultpdpcid, APN );
Err = at_send_command (CMD, null );
Free (CMD );
It is also equivalent to sending: 'At + cgdcont = 1 "ip", "3 GNET", 0, 0'
This is important,
The next step is to send "ATD * 99 *** 1 #", but my situation is weird,
You can use/dev/ttymot0 to succeed and pppd to succeed, but you cannot use/dev/ttymot1 to succeed ..
You have to make/dev/ttymot1 the interface used by rild.
/Dev/ttymot0 serves as the pppd interface, and "ATD * 99 *** 1 #" is sent by/dev/ttymot0, so you have to port another chat.
Next:
Property_set ("net. pp1_status", "0 ");
Asprintf (& cmd, "/system/bin/pppd connect '/system/bin/chat-esvf/system/etc/talk. chat 'user % s password % S/dev/ttymot0 115200 crtscts modem novj noipdefault nobsdcomp usepeerdns defaultroute noauth debug nodetach dump & ", (username = NULL )? "Any": username, (Password = NULL )? "Any": password );
Err = System (CMD );
Logd ("launch: % s and RET is: % d! ", CMD, err );
Free (CMD );

/* Wait for system update property */
For (iretry = 0; iretry <ppp_retry; iretry ++)
{
Sleep (2 );
Property_get ("net. pp1_status", pppstatus, null );
Logd ("net. pp1_status = % s/n", pppstatus );
If (atoi (pppstatus)> 0)
Break;
}

Since pppd does not return immediately, you have to modify pppd. If the connection is successful
Property_set ("net. pp1_status", "1 ");

# Cat/system/etc/talk. Chat
Abort 'busy'
Abort 'no ancer'
Abort 'error'
Timeout 20
'''Atz'
OK atdt * 99 *** 1 #
Connect ""

After successful pppd connection, the gateway and DNS will be set.

 

In addition, by default, the dial-up Internet access function is enabled for Android. However, some mobile phones have been switched.