Hi JH,

On 14/08/2019 13:11, JH wrote:
> Hi Jonas,
> 
> On 8/14/19, Jonas Bonn <jonas@norrbonn.se> wrote:
>> So you have no traffic over the LTE link?  How do you know that it goes
>> down after 1-2 hours... maybe it went down after 5 minutes?
> 
> I logged link status every 10 minutes.

How?  Not clear from what you posted earliest how you can tell that the 
link has gone down.  The default route is set to go over WiFi so a 
generic ping isn't sufficient.  What exactly are you monitoring?

> 
>> Cloud messages are as good as a ping... a packet's a packet.
>> The link is configured by connman, not ofono.  ofono just publishes the
>> address details so that connman can set it up.
> 
> So, it is back to connman?

Well, the log _seemed_ to indicate that connman does an NTP request to a 
server that isn't available and thereby decides to take the link down... 
off the top of my head I can't say whether that's something connman 
actually does so hopefully somebody else will jump in here.  Did ofono 
indicate the context as still established after that?

> 
>>>> No Address?  No Interface?  Running ofono with debug output will
>>>> probably shed some light on what's going on here.
>>>
>>> I think that could be because I only ran it once, if I ran
>>> list-contexts 4 times consecutively, every time it displayed different
>>> results included address and interface, is it the normal behaviour of
>>> list-contexts?
>>
>> Sounds broken...???
> 
> Which one is broken, ofono or connman or something else? There is not
> much configurations for both ofono and connman,

I was referring to the DBus response containing incomplete Settings 
objects.  A random set of properties at each request is not the 
documented behaviour.

> 
> Can the defect hardware particularly the system power supply caused
> the link down? I have only one test device, I cannot prove it. The
> SATA chip has a pin for power up, During the boot, a command to set
> the power up before ofono is running. When the link is down, either I
> restart the ofonod or I called the command to turn the power up again,
> both can bring the link back. I cannot image the chip could lose
> power, but if the system power supply is not stable in some stage too
> low to support the SARA chip, will it trig the power down? I talked to
> the hardware engineer who rejected that it did not make sense because
> WiFi was running fine, he is pointing the figure to the modem manager
> and connection manager.

Seeing the issue with complete logs would be useful.  I thought your 
previous logs indicated connman trying to deactivate the context when it 
took the link down, but the ofono logs didn't show any of that... what's 
going on there?

/Jonas

> 
> Thank you.
> 
> Kind regards,
> 
> - jh
>