Unbranded chinese 2din CarDVD w/Android 4.4.2

drack · Post by **drack** » 07 Jul 2014, 19:21

Hi, after having searched tens of solutions, I dare to say my problem with 3g in Android is kinda unsusual. Please help.

I bought an unbranded Android device for my car in April 2014, specifically this one: (happyshoppinglife.com/honda-civic-android-autoradio-dvd-navigation-with-dtv-wifi-3g-p-1168.html). Since then I can't connect to the Internet using 3G modem. Recently the manufacturer/developer upgraded the Android to a version 4.4.2 (chinabatemon.com/cargpss/android-update-442.rar), so now my system is:
- Model SNT-210
- Android 4.4.2-0140516-sntb-HOMEMADE
- Kernel 3.0101-gdaab9de-dirty
- QDroid@DevServer #9
- Build omnisntb-eng 4.4.2 KOT49H eng.QDroid.20140516.133512 test-keys
Manual: http://www.autoradiodvdgpstv.com/user-m ... er-cp1.pdf. It says NOTHING about the 3g modem connection.

I have no root access:
1|u0_a10@SNT-210: / $
after doing "su":
u0_a10@SNT-210: / $

I don't have permission to run
echo "12d1 1003" > /sys/bus/usb-serial/drivers/option1/new_id

I'm probably unable to root the device because I cannot connect to it (I got a cable: USB type A - USB type A, but it didn't work: no response from Android device nor from my laptop). After clicking "Build number" once (in the "About CarDVD" menu) it shows "No need, you are already a developer", but there are no "developer options" in the Settings menu.

There is the app "3g reconnect" already installed in the system, but after I connect a modem (E230, E220 or K3770) with working SIM (no PIN) in "Plus" (MCC 260 MNC 01) its LED is blinking green, and then blue after a while (one blink per 3-5 sec) but the system remains unchanged. The support (the Chinese via chat, not very nice experience talking: an hour waiting for response) said the modems should work flawlessly

I tried PPP Widget to help me, as well as Android Terminal and Slick USB 2 Serial Terminal.

I set PPP widget to start manually, set APN to "internet", left number to dial unchanged, no user, no password. Option "Disable USB device sleep" IS enabled. After booting without 3g modem, PPP Widget starts and I connect the modem to a USB port. I click on the PPP icon, choose my E230 modem (12d1:1001) and I click connect. PPP Widget searches for the port and tries to connect.

When I turn on logging, portcheck.log says:

== START LOG ==
PPP Widget version 1.3.3
USB_ModeSwitch log from {date}
Raw args from udev: 1-1.1/portcheck

using top device dir /sys/bus/usb/device
SymLinkCheck called with /sys/bus/usb/ttyUSB0

My name is ttyUSB0

Checking my endpoints ...
in /sys/bus/usb/devices/1-1.1/1-1.1:1
checking ep_81 ...
ep_81 has interrupt transfer type

--> I am an interrupt port

--> No interrupt interface below me

Adding port tag file "ttyUSB0" and return
== END LOG ==

When I check the Android Settings (Mobile status) there is:
Network: unknown
Signal strength: 2147483647 dBm 255 asu
Mobile network type: Unknown
Service state: Out of service
IMEI: {my SIM's IMEI}
IMEI SV: Unknown
IP address: Unavailable
WiFi MAC address: {some MAC address}

When I turn Android Terminal it goes:
lsusb:
Bus 001 Device 001: ID 1d6b:0002
Bus 002 Device 001: ID 1d6b:0001
Bus 001 Device 002: ID 05e3:0608
Bus 001 Device 003: ID 0bda:8176
Bus 001 Device 007: ID 12d1:1003
Bus 001 Device 005: ID 04e8:6860

Sometimes There is Bus 001 Device 005 instead of 007 by 12d1:1003

When I try to use Slick USB 2 Serial Terminal it connects to the modem and answers all the AT commands:
ATI
Huawei
E230
Rev. 11.104.20.00.00
IMEI...
+GCAP: +CGSM +DS +ES

AT+CSQ
15.99

AT^SYSINFO
2,3,0,5,1,,4

AT+COPS=?
(1,"Plus","PLUS","26001",0), (2,"Plus","PLUS","26001",2) ... {and other}

AT+COPS?
0,2,"26001",2

I can swich the modem's mode:
AT^U2DIAG=0
the default was AT^U2DIAG=257
After switching to AT^U2DIAG=0 the modem seems to be recognised by lsusb as 12d1:1001

I tried to connect manually:
AT+CGDCONT=1,"IP","internet"
ATD *99***1#
.. and it returned CONNECTED

but when I went back to the home screen and tried to check if there is Internet access (I turned on Chrome), there was no Internet access, but I have to revise this once more.

What can I do?

Greg

Post by **Josh** » 08 Jul 2014, 07:51

drack wrote:PPP Widget searches for the port and tries to connect.

Do you get the message "Connecting ..." after you hit the connect button?

If so, do you get a PPP log in PPP Widget as well?

It looks like everything is working up to the point of using the "pppd" tool which negotiates the network connection right after successful dialling.

drack · Post by **drack** » 08 Jul 2014, 20:25

Josh wrote:Do you get the message "Connecting ..." after you hit the connect button?

Josh, thanx for your reply. I'll record a video so that everything is clearly visible and nothing ommited and post a link here.

Post by **Josh** » 08 Jul 2014, 21:53

The point is that we need to see what the "pppd" program is doing (or not doing).

If you don't get a PPP log with PPP Widget (that is, the "PPP Log" button at the bottom of the configuration page is inactive), then we don't have many other options to get to the bottom of the problem.

Also note that your Android system is obviously equipped to work with 3G modems, and there are likely several conflicts because PPP Widget is trying to do the same.

drack · Post by **drack** » 09 Jul 2014, 12:52

Josh wrote:The point is that we need to see what the "pppd" program is doing (or not doing).

If you don't get a PPP log with PPP Widget (that is, the "PPP Log" button at the bottom of the configuration page is inactive), then we don't have many other options to get to the bottom of the problem.

Also note that your Android system is obviously equipped to work with 3G modems, and there are likely several conflicts because PPP Widget is trying to do the same.

Josh, PPP log says only "Using port ttyUSB0 for connection". You can see that in the video I recorded today: https://www.youtube.com/watch?v=sEJMvUQhTJA.

Before checking what the pppd is doing I think I need to verify what processess are in deed running with "ps" command. And I don't see any process called pppd. "Ps" gave me the result (3g modem connected, SD card inserted in /sdcard2/ slot):

ps