Re: Telit he910 ---- modem port got stuck

[Denis Kenzior <denkenz@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 1452 bytes --]

Hi Jonas,

On 03/12/2013 08:42 AM, Jonas Bonn wrote:
> On 03/12/2013 02:26 PM, Ming Li Wu wrote:
>> Hello,
>>
>> I am using Telit HE910 modem, the version of firmware is 12.00.03.
>>
>> Sometimes, the modem port got stuck after sending AT+CGDCONT=1.
>> (Such as AT+CGDCONT=1,"IP","internet.tele2.se").
>>
>>
>> The following was the situation when this problem happened
>> Aux: > AT+CRSM=192,28621\r
>> Modem: > AT+CGDCONT=1,"IP","internet.tele2.se"\r
>> Modem: < AT+CGDCONT=1,"IP","internet.tele2.se"\r
>> Aux: < \r\n+CME ERROR: 4\r\n
>
> The problem, in short, is that the Telit HE910 does not support sending
> any AT command on the Modem port while there is an outstanding command
> on the Aux port (this should be true for all Telit modems). Does Ofono

Many M2M setups use the modem from multiple applications (e.g. one app 
uses one port for SMS, another for data, another for GPRS).  So I'd be 
surprised if the Telit firmware had such a limitation.  If that is the 
case, then the Telit firmware is broken and should be fixed.

> support synchronizing these two channels so that they effectively share
> a common command queue? If yes, how?

There is no such capability.  That would defeat the purpose of having 
multiple channels in the first place.  About the only thing you can do 
is drive everything off of the AUX serial port and only use the Modem 
port for entering into PPP mode.

Regards,
-Denis