u3g Sierra Wireless LTE device disconnects ppp after 2-3MB of outgoing traffic

[mike tancsa]

On 12/11/2019 11:34 AM, Adrian Gschwend wrote:
> On 11.12.19 21:24, mike tancsa wrote:
>
>> Do you have LQR/ech enabled ?  Here is the ppp.conf section I use
> yeah, it's pretty much based on what you proposed, main change was APN.
>
> Later I did add
>
> set reconnect 3 5
>
> Hoping that this adds something but apparently it does not.


How are you starting ppp ?  ppp -ddial target ?

>> Depending on your modem, some Sierra's dont allow the GSTATUS command
>> from the management port, just signal info. Eg. port /dev/cuaU0.3 is my
>> data port to make my ppp connection on, I can connect to cuaU1.4 to ask
>> some basic info like signal.  Sierra should have a pretty good AT
>> command set manual free to download so you can see what is exactly
>> available.
> yes I have that one.
>
>> % cu -l /dev/cuaU1.4
>> Connected
>> Sierra Wireless, Incorporated
>> MC7700
>> APP1
>>
>> OK
>> +CSQ: 21,99
>> OK
> That does not work on mine, on 2 I get "all ports are connected" but
> that's where PPP is running on. On the others I get "connected" but
> never any output (and also no echo)
on cuaU1.4 just type

ati <enter>

You wont see what you type, but you should get MCC7700. Does that not work ?

>
>> for whatever reason, ate1 is not respected, so my commands dont show.
>> the above is the output of entering ati and at+csq
> I've seen that too
>
>>  set lqrperiod 10
>>  enable lqr
>>  enable echo
>>
>> should allow ppp to reconnect should ppp disconnect.
> unfortunately it doesn't. The link seems still up but absolutely nothing
> goes through anymore.
>
> The only thing I can do is kill ppp and restart it, then I have a link
> again immediately.

your ppp logs should show you something when the connection dies. Whats
in the logs ?