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Linuxslate.com Forums › Mobile Linux Devices › Linux Based Mobile Phones
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Connecting to R2821 (Read 740 times)
simonv
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Connecting to R2821
Nov 11th, 2009, 3:28am  
Hello,  
 
I'm quite new to this, and I hope you can help me with the basics.
 
I have a R2821 branded as DP72 by Vutek (vutek.com.tw ).
I'm would like to deploy my own applications on it eventually ( I have some C/C++ experience), but for now I'm looking for a way to gain shell access to the phone.  
 
Currently I can browse and view the files using the file:/// method described in the review, but I couldn't connect with an OBEX connection.  I can connect the phone to a Windows pc and download files to the phone (but only to the predefined locations). I can connect to the GSM modem and issue AT commands, and that's about all.
 
How can I gain shell access to the phone, and is it even possible?
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Re: Connecting to R2821
Reply #1 - Nov 17th, 2009, 10:51pm  
As I received the phone, shell access is not possible.
 
telnetd is in there, but I have not found a way to launch it.
 
With the firmware you provided a link to, it may, however, be possible to provide a modified firmware that has telnetd, (or sshd) running.
 
Standard ARM non-gui binaries should work, as should a standard C program compiled for ARM.
 
Getting a full toolchain to compile GUI apps for this phone would take some doing, but it should be very similar to the work done for openEZX.
 
There are also lots of resources out there for the TI OMAP system this phone is build on, so compiling native apps should not be difficult, it's just that as far as I can tell so far, no one (out side of E28) has done it yet.
 
I am probably not smart enough to be able to provide a complete tool chain myself, and there is likely very little demand for one, but hopefully this forum will help get additional interested folks together if there are any.
 
If I come up with anything, I'll certainly post it here.
 
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Re: Connecting to R2821
Reply #2 - Nov 18th, 2009, 8:48pm  
Breakthrough !!!   I'm not sure why I did not see this on the OpenTwin.org website before.
 
From the OpenTwin.org webiste:
http://opentwin.org/wiki/Se_connecter_au_telnet_du_Twin_Tact
 
Just dial the number:
 
*#128*12819#
 
You'll get a message:  "telnet can be used!"
You can now telnet into the phone.
Works until next reboot.
 
Go to:
    Tools and Setup >> Connect PC >> Mobile Device
    Connect the USB cable
On PC (terminal)  (You should now have a USB0 network in ifconfig)
# ifconfig usb0 169.254.0.1 netmask 255.255.255.0
$ telnet 169.254.0.2
 
No password needed.  You will be root
 
Here's some more (I've probably totally slagged my phone with all these)  Don't try this at home.
 
*#128*12801#  <displays SW version Number  V2.60-WT  for my S282 branded model>
*#128*12802#  open Hisense config failed
*#128*12803# <no result>
...
*#128*12810# <no result>
*#128*12811#  <displays a lot of info under tabs (Phone, GSM, GPRS)>
*#128*12812#  <displays battery status and battery level (Numerical)>
*#128*12813#  usblan connect
*#128*12814#  usblan disconnect
*#128*12815#  do not enter standby mode
*#128*12816#  can enter standby mode
*#128*12817#  UART Enable
*#128*12818#  UART Disable
*#128*12819#  Telnet enable
*#128*12820#  GSM FFS Backup  <Blue LED Stays on>
*#128*12821#  switch to gsm_lo
*#128*12822#  switch back to cam_data
*#128*12823#  <no result>
*#128*12824#  enable auto answer!
*#128*12825#  disable auto answer!
*#128*12826#  VoIP setting will cost 10s please wait until the indicator turns blue <seems to have enabled WiFi, when it was disabled on the regular WiFi screen. Did not seem to do anything else.>
 
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Re: Connecting to R2821
Reply #3 - Nov 19th, 2009, 3:11pm  
Quick follow up:
 
A short cut.
 
*#128*12819#   Enables Telnet, and:
*#128*12813#   Forces USB lan mode.
 
So all I have to do is enter the first, then edit the 19 to 13, and I am ready to give the PC an IP address and telnet in.
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