Re: Reset modem while using pppd

[walter harms <wharms@bfs.de>]

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Am 07.11.2017 16:11, schrieb Léo Serre:
> Hello world,
> 
> I'm using pppd with a SARA-U201 3G+ modem (from u-blox).
> It works fine normally, except in that case:
> 
>  1. pppd is connected to the modem correctly
>  2. pppd is stopped using poff
>  3. The chat script is changed by the user
>  4. pppd is started using pon
> 
> That introduces an error, since the modem won't accept a new PIN code as
> it is already connected correctly.
> 
> The way to fix that is to send a SW reset AT command 'AT+CFUN=1,1'
> between steps 2 and 4.
> That's why I introduced a new disconnect chat script which consists of:
> 
>     ABORT 'BUSY'
>     ABORT 'NO CARRIER'
>     ABORT 'VOICE'
>     ABORT 'NO DIALTONE'
>     ABORT 'NO DIAL TONE'
>     ABORT 'NO ANSWER'
>     ABORT 'DELAYED'
>     TIMEOUT 180
>     'OK' 'AT+CFUN=1,1'
> 
> I have the following output:
> 
> Jan  1 02:24:47 domeradio local2.info chat[568]: abort on (BUSY)
> Jan  1 02:24:47 domeradio local2.info chat[568]: abort on (NO CARRIER)
> Jan  1 02:24:47 domeradio local2.info chat[568]: abort on (VOICE)
> Jan  1 02:24:47 domeradio local2.info chat[568]: abort on (NO DIALTONE)
> Jan  1 02:24:47 domeradio local2.info chat[568]: abort on (NO DIAL TONE)
> Jan  1 02:24:47 domeradio local2.info chat[568]: abort on (NO ANSWER)
> Jan  1 02:24:47 domeradio local2.info chat[568]: abort on (DELAYED)
> Jan  1 02:24:47 domeradio local2.info chat[568]: timeout set to 180 seconds
> Jan  1 02:24:47 domeradio local2.info chat[568]: expect (OK)
> Jan  1 02:24:49 domeradio local2.err chat[568]: SIGTERM
                                                  ^^^^^^

You are expecting a 'ok' from the modem that never appears -> timeout
did you try '' 'AT+CFUN=1,1' ?

> Jan  1 02:24:49 domeradio daemon.warn pppd[534]: Child process
> /usr/sbin/chat -v -t15 -f /etc/ppp/chatscripts/mobile-modem-off.chat
> (pid 567) terminated with signal 15
> Jan  1 02:24:49 domeradio daemon.warn pppd[534]: disconnect script failed
> Jan  1 02:24:50 domeradio daemon.info pppd[534]: Exit.
> 
> It seems that the command is never sent.
> 
> My two questions are:
> 
>  1. Do you have an idea about the command that is never sent?
>  2. Is there an other way to send an AT command while pppd is running
> (or none)?
> 
> Thank you,
> 
> Léo SERRE
> 🌍  leo@lstronic.com <mailto:leo@lstronic.com>
> 📧  lstronic.com <http://lstronic.com>
> 
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