MM 1.14.2: Question about bearer disconnect

[CIFELLI Giacinto]

Hi,

> -----Original Message-----
> From: Aleksander Morgado [mailto:aleksander at aleksander.es]
> Sent: Samstag, 7. November 2020 17:47
> To: Girish Mahadevan <girish_mahadevan at trimble.com>
> Cc: ModemManager (development) <modemmanager-
> devel at lists.freedesktop.org>; CIFELLI Giacinto
> <giacinto.cifelli at thalesgroup.com>
> Subject: Re: MM 1.14.2: Question about bearer disconnect
> 
> Hey,
> 
> > We're running 1.14.2 on a Cinterion (PLS62W) module.
> >
> > The modem is connected for a while and suddenly loses registration
> > causing MM to start a forced disconnect of the bearer, but the attempt
> > at disconnection fails.
> >
> > Oct 29 22:11:24.709516 ModemManager[530]: <info>  [1604009484.709151]
> > [modem0] state changed (connected -> disconnecting) Oct 29
> > 22:11:24.768445 ModemManager[530]: <debug> [1604009484.768058]
> > [modem0/bearer0] sending PDP context deactivation in primary port...
> > Oct 29 22:11:24.772352 ModemManager[530]: <debug>
> [1604009484.771977]
> > [modem0/ttyACM1/at] device open count is 2 (open) Oct 29
> > 22:11:24.777015 ModemManager[530]: <debug> [1604009484.776642]
> > [modem0/ttyACM1/at] --> 'AT+CGACT=0,1<CR>'
> > Oct 29 22:11:24.966486 ModemManager[530]: <debug>
> [1604009484.965979]
> > [modem0/ttyACM1/at] <-- '<CR><LF>+CME ERROR: 202<CR><LF>'
> > Oct 29 22:11:24.968238 ModemManager[530]: <debug>
> [1604009484.967858]
> > [modem0/ttyACM1/at] invalid mobile equipment error code: 202
> 
> 
> Is 202 a generic error code, or Cinterion specific? Did you look that up?

202 means "incorrect parameter"
According to the ATC notes to the AT+CGACT command:
- If activation or deactivation of a context fails, then AT+CEER may provide further informations about the reason.
- For EPS, if an attempt is made to disconnect the last PDN connection, then the MT responds with ERROR or, if extended error responses are enabled, a +CME ERROR.

this second clause applies here: it is not possible to deactivate the PDN linked with the LTE attach, as this would detach from the network completely.

Best Regards,
Giacinto

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