Hi again,

the problem seems to be in the
atmodem/gprs-context.c : gprs_activate_primary
function, where

     if (g_at_chat_send(gcd->chat, buf, none_prefix,
                 at_cgdcont_cb, gc, NULL) > 0)

is called after a reconnect, and then it fails.


It seems to work if I call

     g_at_chat_send(gcd->chat, "AT&C0", none_prefix,
                 NULL, NULL, NULL)

prior.

So this would mean that a disconnect or similar action sets DCD to low,
and the chats are closed.

Does oFono anywhere in the code sets DCD explicitely to low or is it 
maybe a bug?

My patch would look something like this (if it is an HE910 issue only):

     if (gcd->vendor == OFONO_VENDOR_TELIT)
     {
         if(g_at_chat_send(gcd->chat, "AT&C0", none_prefix,
                     NULL, NULL, NULL) <= 0)
             goto error;
     }


Thanks,
Marko


Am 2015-06-25 um 11:15 schrieb Marko Sulejic:
> Hi,
>
> I need your help in using a Telit HE910 with ofono (and eventually 
> connman).
> (I am using ofono 1.16 with HE910 firmware version 12.00.006; connman 
> version is 1.29).
>
> My problem is the following ...
> on startup everything works fine and the ppp0 connection is established,
> but problems occur in the following case:
>
> connmanctl> disconnect cellular_*_context15
> Disconnected cellular_*_context15
>
> connmanctl> connect cellular_*_context15
> Error /net/connman/service/cellular_*_context15: Input/output error
>
>
> ofonod[5355]: gprs-context.c(244):at_gprs_activate_primary() cid 1
> ofonod[5355]: gprs.c(889):pri_activate_callback() 0x1a18c50
> ofonod[5355]: gprs.c(893):pri_activate_callback() Activating context 
> failed with error: Unknown error type
> connmand[3815]: Failed to change property: /he910_0/context15 
> org.ofono.ConnectionContext.Active: org.ofono.Error.Failed Operation 
> failed
>
>
> The same error happens if I am manually sending connect/disconnect via 
> dbus-send.
>
> Only a hard ofono restart can establish the connection again.
> This behavior happens all the time once a ppp0 disconnect happened
> (e.g. by removing the SIM; manual disconnect via dbus or connmanctl).
>
> A subquestion regarding connman:
> Can connmand be configured in such a way that on every connection
> loss, ofono is triggered to reconnect to the Internet?
>
> Thank you very muchin advance,
> Marko
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