Hi Homam,

There is no top-posting on this mailing list.  Please do not top-post.

On 03/28/2014 09:20 AM, Homam Dabis wrote:
> The issue seems sepcific to the E303 HiLink H-2 model.
> 
> If I do the same thing using the E303 HiLink S-1 model then all is fine.
> 
> Huawei seem to have updated their chipset with the H-2 revision and are
> stopping production of the S-1 revision.
> 
> Cedric: Can you provide me with more details please. 

There was a quirk in certain manufacturer's modems whereby they
forcefully HUPed the modem port when the PPP link was disabled.  That
meant that the port had to be closed and re-opened after every context
activation / deactivation.

This is normally turned off with AT&C0.  Re-opening the modem port is
actually not trivial.  Search the archives / git, there have been
previous attempts at doing this which were abandoned.  The easiest
solution will be to figure out why AT&C0 doesn't work.

Regards,
-Denis