Unexpected +CGDCONT? error: 'Sending command failed: 'Resource temporarily unavailable''

[Piotr Figiel]

Hi Ben,
 I stumbled on similar issues when dealing with modem restarts on 1.6.
 This was briefly discussed here:
https://lists.freedesktop.org/archives/modemmanager-devel/2017-June/005016.html
 In that case patch I sent in last message fixed the issue with modem
reappearing though the underlying reason for those two issues may be
common (and probably remains unsolved).

Best regards, Piotr.

2017-07-20 11:15 GMT+02:00 Ben Chan <benchan at chromium.org>:
> On Thu, Jul 20, 2017 at 1:42 AM, Ben Chan <benchan at chromium.org> wrote:
>> Looking into it a bit more, the periodic signal update doesn't seem to
>> cause the issue. But it seems like the primary port is closed and then
>> reopened, and the init sequence runs while a connect operation is
>> starting.
>>
>
> Looks like the problem is that, the data port is closed and reopened
> during the disconnect operation. When the port is reopened, the init
> AT sequence is sent via mm_port_serial_at_run_init_sequence, which
> returns immediately without waiting for AT responses. The disconnect
> operation completes but the init AT sequence may still be sending out.
> A connect operation could happen right after the disconnect operation
> completed but in the middle of an init sequence.
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