Re: Mobile Broadband - how do I trace/debug the modem initialisation?

On Tue, 2008-10-21 at 11:03 +0300, Tambet Ingo wrote:
On Tue, Oct 21, 2008 at 10:47 AM, Craig Main <cmain fnb co za> wrote:
> I am having a similar issue on my Dell Latitude E6500 which has a Broadcom
> 5530 buildin hsdpa minicard. This device gives an ERROR when sent an ATZ
> command. Using a chat script or wvdial with a cusomized wvdial.conf file
> which leaves out the ATZ command, the modem works flawlessly. When using
> NetworkManager however it does not. Here is the trace from NetworkManager
> NetworkManager: <info>  Activation (ttyACM0) starting connection 'Vodacom'
> NetworkManager: <info>  (ttyACM0): device state change: 3 -> 4
> NetworkManager: <info>  Activation (ttyACM0) Stage 1 of 5 (Device Prepare)
> scheduled...
> NetworkManager: <info>  Activation (ttyACM0) Stage 1 of 5 (Device Prepare)
> started...
> NetworkManager: <debug> [1224572376.061516] nm_serial_device_open():
> (ttyACM0) opening device...
> NetworkManager: <info>  Activation (ttyACM0) Stage 1 of 5 (Device Prepare)
> complete.
> NetworkManager: <debug> [1224572376.169089] nm_serial_debug(): Sending: 'ATZ
> E0 V1 X4 &C1 +FCLASS=0
> '
> NetworkManager: <debug> [1224572376.196931] nm_serial_debug(): Got: 'ATZ E0
> V1 X4 &C1 +FCLASS=0
> '
> NetworkManager: <debug> [1224572376.246578] nm_serial_debug(): Got: 'ATZ E0
> V1 X4 &C1 +FCLASS=0
> '

The init string has more commands than (AT)Z (reset): It turns off
echo (E0), sets verbose mode (V1) etc... Can you try to send only
"ATZ" and "ATZ E0 V1" to your modem (using minicom or kermit or
wvdial) and see if that works? Or if it's specifically "Z" command
that doesn't work, does this command work: "ATE1 V1 X4 &C1 +FCLASS=0"
? I've seen a device which doesn't like "+FCLASS" command.

--Minicom Trace--

Welcome to minicom 2.3

Compiled on May  3 2008, 10:44:23.
Port /dev/ttyACM0

                 Press CTRL-A Z for help on special keys
AT S7=45 S0=0 L1 V1 X4 &c1 E1 Q0                    
ATE1 V1 X4 &C1 +FCLASS=0

--End Trace--

On a slightly related note, this modem also requires that the RF circuit gets turned on with AT+CFUN=1


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