Huawei E620 - pppd dies after disconnecting monitor on /dev/ttyUSB2

I

Inte

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Hi alltogether,
I use a Huawei E620 (ID: 12d1:1001) and monitor the signal quality with xfce4-cellmodem-plugin (also tried comgt & minicom). Everytime I close the application (connected to /dev/ttyUSB2) the pppd dies.

The PPP daemon has died: A modem hung up the phone (exit code = 16)

With enabled syslog debugging:
Code: 
Mar 26 22:00:25 [pppd] Script /etc/ppp/ip-up started (pid 24146)
Mar 26 22:00:26 [pppd] rcvd [IPCP ConfReq id=0x28]

--> pppd dies

Mar 26 22:00:26 [pppd] Connect time 0.1 minutes.
Mar 26 22:00:26 [pppd] Sent 0 bytes, received 4 bytes.
Mar 26 22:00:26 [pppd] sent [IPCP ConfReq id=0x5 <compress VJ 0f 01> <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
Mar 26 22:00:26 [pppd] sent [IPCP ConfNak id=0x28 <addr 0.0.0.0>]
Mar 26 22:00:26 [pppd] Modem hangup
Mar 26 22:00:26 [pppd] Connection terminated.
Mar 26 22:00:26 [pppd] Waiting for 1 child processes...
Mar 26 22:00:26 [pppd] script /etc/ppp/ip-up, pid 24146
Mar 26 22:00:31 [pppd] sending SIGTERM to process 24146
Mar 26 22:00:31 [pppd] Exit.

--> Automatic wvdial redial 

Mar 26 22:00:42 [pppd] pppd 2.4.4 started by tobias, uid 1000
Mar 26 22:00:42 [pppd] using channel 21
Mar 26 22:00:42 [pppd] Using interface ppp0
Mar 26 22:00:42 [pppd] Connect: ppp0 <--> /dev/ttyUSB0

Used drivers:
2.6.19-gentoo-r5
> CONFIG_USB_SERIAL=y
> CONFIG_USB_SERIAL_OPTION=y

I don't have a clue what causes the interfere of ttyUSB0 and ttyUSB2. Maybe you have.

Inte
 
Last edited:
Just guessing here.. maybe it's caused by the app reseting the modem on disconnect?
Try quitting minicom with Ctrl+A, Q instead of the usual Ctrl+A, X... that'll quit without reseting the modem.. if it works then thats obviously your problem...

This is just a hunch though.. :)
Reseting the modem does not terminate pppd with my E220..
 
Last edited:
redarrow said:
Just guessing here.. maybe it's caused by the app reseting the modem on disconnect?
Click to expand...
If it were so easy. :( I'm already in contact with the xfce4-cellmodem dev and he also has no clue what the reason is.

redarrow said:
Try quitting minicom with Ctrl+A, Q instead of the usual Ctrl+A, X... that'll quit without reseting the modem.. if it works then thats obviously your problem...
Click to expand...
It doesn't matter if I quit minicom by using 'Q' or 'X'.
 
Eish.. :confused:

Is there a reason you must connect to /dev/ttyUSB2 to check signal or whatever?
With my E220 I can connect to /dev/ttyUSB1 to check signal or other stuff whilst connected... not that I see how that could really make a huge difference though..

It's weird though.. :confused:
 
redarrow said:
Is there a reason you must connect to /dev/ttyUSB2 to check signal or whatever?
Click to expand...
Yes, there is a reason. minicom for example connects to ttyUSB1, but isn't able to send any AT commands to the modem, as comgt and xfce4-cellmodem also can't.
 
Inte said:
Yes, there is a reason. minicom for example connects to ttyUSB1, but isn't able to send any AT commands to the modem, as comgt and xfce4-cellmodem also can't.
Click to expand...
I see...
In my case with my E220 it's the other way around ... ttyUSB2 can't seem to be used for anything...


Sorry, I'm out of ideas for now.. :o

You'll have to wait for Tazz_Tux ... maybe he's got some ideas.. ;)
 
redarrow said:
I see...
In my case with my E220 it's the other way around ... ttyUSB2 can't seem to be used for anything...


Sorry, I'm out of ideas for now.. :o

You'll have to wait for Tazz_Tux ... maybe he's got some ideas.. ;)
Click to expand...

( Oh - I saw now that you have an e620 - I have one at the office, so try this tip below and if you don't have any luck, pm me and I will look at it :) )

Wow - nice one.....

Here is a few of mine ideas:

Normally, the cards work like this:

ttyUSB0 - GSM Interface
ttyUSB1 - Upgrade/prop. Interface
ttyUSB2 - Application Interface

(This is what I have gathered over time - not taken from a manual)

So, normally you would setup on ttyUSB0, and monitor via usb2. Now we have seen some very weird things with the e220 under linux (btw - I saw a changelog for the e220 somewhere on the usbserial driver dev group - so watch this space)

I suspect that the e220/linux assigns these ports as the hardware is ready since it doesn't really have a normal startup (It has that usbstorage as well)

So - the long and short is, try usb2 as the dialup and monitor on usb0 ?
 
Tazz_Tux said:
( Oh - I saw now that you have an e620 - I have one at the office, so try this tip below and if you don't have any luck, pm me and I will look at it :) )
Click to expand...
Hmm.. no I don't? :confused: I have an E220.. :confused: Or are you reffering to Inte? - Just confused since you quoted me.. :o :)

Tazz_Tux said:
Wow - nice one.....

Here is a few of mine ideas:

Normally, the cards work like this:

ttyUSB0 - GSM Interface
ttyUSB1 - Upgrade/prop. Interface
ttyUSB2 - Application Interface

(This is what I have gathered over time - not taken from a manual)

So, normally you would setup on ttyUSB0, and monitor via usb2. Now we have seen some very weird things with the e220 under linux (btw - I saw a changelog for the e220 somewhere on the usbserial driver dev group - so watch this space)

I suspect that the e220/linux assigns these ports as the hardware is ready since it doesn't really have a normal startup (It has that usbstorage as well)

So - the long and short is, try usb2 as the dialup and monitor on usb0 ?
Click to expand...
I tried this on my E220 out of curiosity...

My results:
I cannot connect using ttyUSB2 I just get: (the file /dev/ttyUSB2 does exist btw.. regardless of what wvdial seems to think)
wvdial output said:
--> WvDial: Internet dialer version 1.54.0
--> Cannot open /dev/ttyUSB2: No such file or directory
--> Cannot open /dev/ttyUSB2: No such file or directory
--> Cannot open /dev/ttyUSB2: No such file or directory
Click to expand...

Trying to connect on ttyUSB1 has a strange result.. it starts attempting to connect but doesn't seem to manage:
wvdial output said:
--> Modem initialized.
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Sending: AT+CGDCONT=1,"IP","internet"
AT+CGDCONT=1,"IP","internet"
OK
--> Modem initialized.
--> Sending: ATDT*99***1#
--> Waiting for carrier.
ATDT*99***1#
^BOOT:37087801,0,0,0,6
^BOOT:37087801,0,0,0,6
Click to expand...

Funny thing is after having tried to connect via ttyUSB1, then going back to ttyUSB0 I suddenly get:
wvdial output said:
--> WvDial: Internet dialer version 1.54.0
--> Cannot open /dev/ttyUSB1: No such file or directory
--> Cannot open /dev/ttyUSB1: No such file or directory
--> Cannot open /dev/ttyUSB1: No such file or directory
Click to expand...
Which make me think that attempting to connect on ttyUSB1 messes up some sort of internal mode or something..? - I needed to unplug and replug after that to restore the device..

Anymore info on the speed of the E220 btw? My E220 totally maxes out at 496kbps.. - It will not budge above that.. but it sits so comfortably there that I doubt it's the signal strength in my case.. :cool:
 
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