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Reassign to Erin, who is the exact person working on RIL at 0xlab.

Expected to allow the communications between passthrough GSM modem and RIL on
Beagleboard.

Verify this issue in Android emulator (ubuntu9.04) + GTA02 GSM modem

On Neo

  root@om-gta02:/sys# echo 1 > /sys/devices/platform/neo1973-pm-gsm.0/power_on
  root@om-gta02:~# nc -l -p 4270 < /dev/ttySAC0 > /dev/ttySAC0 &

On Ubuntu

 erin@daydreamer:~/$ pty 192.168.0.202 4270 &
 erin@daydreamer:~/mydroid_emu/out$ ./host/linux-x86/bin/emulator -system
./target/product/generic/system.img -sysdir ./target/product/generic/system -data
./target/product/generic/userdata.img -kernel
../prebuilt/android-arm/kernel/kernel-qemu -ramdisk
./target/product/generic/ramdisk.img -qemu -serial /dev/pts/2

On Android Emulator

  modify /system/build.prop
    rild.libargs=-d /dev/ttyS2

Based on this scenario, I can see the communication between RIL and GSM modem and it
runs normally. But still have some problems in RIL, like the radio state is wrong and
it displays NO SIM card, actually it already camp to the GSM network. Also, I found
something wrong on sqlite db. it cannot update the current operator info to telephony.db

Now, I start to use beagle board to verify NEO GSM modem and still have some problems
on connecting them. Trying to fix it!

Based on master tree from Android git server on Aug 24, i built an Android emulator
and modified few code. I can use NEO as an external modem now. Please check the
attached screen shot. I can camp to GSM network and also retrieve SMS message from
SIM card. 

	Screenshot-Android Emulator (<build>:5554).png 50.7 KB   View   Download

I am stuck on RIL now. I tried to run two Android emulators and tried to call to each
other. It would reject an incoming call from sending AT command 'AT+CHLD=0' to modem.
On this case, i cannot receive any calls from GSM network.

I found why i cannot receive incoming call.
http://code.google.com/p/android/issues/detail?id=1858
after set 'Settings.Secure.DEVICE_PROVISIONED' to 1, it can receive
the incoming call now. Looks pretty good...
* Camp to GSM network [OK]
* Receive incoming call and answer [OK]
* Dial out and hangup [OK]
* Send/Receive SMS [OK]

I wrote a HOWTO in my blog. If anyone has interests about this issue, you may read it
for reference.
http://i-miss-erin.blogspot.com/2009/09/android-emulator-external-gsm-modem.html

Ready to work on beagle-donut?

mmh...after we upgrade beagle to donut version, i can start to work on it. Probably
from the end of this week. 

Hi Erin, 
 For your reference.
I put a tickminicom in /home/root in Freerunner, disable starting up xserver in
/etc/rc5.d, adding export_modem.sh in /etc/init.d/, and then link this script in
/etc/rc5.d as a starting script. 

This may help setting up the Freerunner and Audio path in advance. 

export_modem.sh 562 bytes   Download

Finally, I can connect external GSM modem (GTA02) in Beagle board successfully now. I
found why I saw weird modem behaviour in Beagle board is device path problem. Here is
the path to solve this problem [1]. 

Currently I am using beagle-donut branch, ril status is as below:

* camp to network in UI (OK)
* dial out a phone call from dialer UI (OK, but not check sound yet)
* incoming call in UI (received AT commands, but no response in UI)

Hi Tick, 
Thanks for the shell script! I will try to see whether audio path is OK or not.

[1]
http://gitorious.org/0xdroid/hardware_ril/commit/397b551e9652c41acd16ea1f9d9e17de8a5a0f47

Erin,

Great work!  Once the infrastructure is ready, it is time to close this issue, and
file new issues specific to detailed phone functionality.

close this issue and file a new issue about strange interactions between modem and UI.

upload pty.c file and made some tiny changes for displaying debug information and
changing mode of opened device.

pty.c 4.5 KB   Download