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vie
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Chateau LTE12 drops connection to LTE network?

Tue Sep 20, 2022 11:43 am

Hello!

For introduction I would like to warn any reader that I am total noob and would like to ask for explanations of any technical details to be adjusted as for a child or a golden retriever.

I bought MikroTik Chateau LTE 12 router in June 2021 and everything was excellent until 2 months ago. The problem is that internet connection is lost for a minute or two at random times usually within 10-20 minute time frame. Having a zoom call will lead to being disconnected for 3-4 times within one hour. VPN connection gets lost also within the same 10-20 minute time frame (I need it for Solidworks licence)
I wanted to blame the mobile network operator at first, but there are few things I would like to make sure before I get into fight with them:
1) there is only power LED turned on in front panel (see attached picture "front panel"). At the moment of writing I have connected my laptop with LAN cable and my phone is connected to wifi (mobile data turned off to make sure that phone uses wifi) so I would expect more than just power LED to be shining. Am I missing something?
2) I would appreciate any comments on actual network signal quality? Attached is picture of "some details".
3) Another thing I noticed is that when internet is not working, lte disappears from "interfaces" list - attached are 2 pictures of "OK" and "not OK" for moments when everything was fine or bad respectively.
Is there some logfile that could contain some more details about those disconnections? My main goal is to find out if that is mobile network or the router misbehaving. And then in case of router being the culprit it would be nice to understand how to fix that.
Do I need to extract and post here some config of the router? How do I do that? I see that in the top right corner I can switch over to terminal and I did take a look at the list of available commands with '?', but that is about it (I do have some experience with Linux so I have seen terminal and executed some commands there and that is how far my noob status reaches...)
Thanks in advance for any tips of where should I poke next...
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vie
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Re: Chateau LTE12 drops connection to LTE network?

Tue Sep 20, 2022 11:18 pm

BTW I did find the log and the only lines about LTE are like this:

22:32:54 interface,info lte1 link down
22:32:54 lte,info lte1 mbim: error: wdm send failed: 19
22:33:21 lte,info lte1: IPV4: 10.104.200.142, DNS: 2
22:33:21 interface,info lte1 link up

22:42:01 interface,info lte1 link down
22:42:01 lte,info lte1 mbim: error: wdm send failed: 19
22:42:26 lte,info lte1: IPV4: 10.104.167.58, DNS: 2
22:42:26 interface,info lte1 link up

22:50:51 lte,error lte1: reply timeout for: AT+QENG="servingcell"

22:51:10 interface,info lte1 link down
22:51:10 lte,info lte1 mbim: error: wdm send failed: 19
22:51:35 lte,info lte1: IPV4: 10.81.180.204, DNS: 2
22:51:35 interface,info lte1 link up

23:00:39 interface,info lte1 link down
23:00:39 lte,info lte1 mbim: error: wdm send failed: 19
23:01:05 lte,info lte1: IPV4: 10.80.206.60, DNS: 2
23:01:05 interface,info lte1 link up

Can anyone explain this please?
 
hecatae
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Re: Chateau LTE12 drops connection to LTE network?

Mon Sep 26, 2022 5:33 pm

Hi,

What LTE firmware version are you using, and why are you not on the latest stable release 7.5?
 
vie
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Re: Chateau LTE12 drops connection to LTE network?

Mon Sep 26, 2022 8:55 pm

Hi,

What LTE firmware version are you using, and why are you not on the latest stable release 7.5?
Because that is what the device was shipped with and it worked perfectly for more than a year. So I did not see any reason why would suddenly the problem would be caused by LTE firmware or routerOS. And that is where I was wrong - few days ago I found another forum thread by googling that particular "lte,info lte1 mbim: error: wdm send failed: 19" error message from log and the solution there was updating LTE firmware. It did take me some time because I did it from "quick set" (initially I had EG12EAPAR01A04M4G) and it updated to EG12EAPAR01A10M4G and the stability of connection to network got even worse. Then I updated routerOS to 7.5 and then LTE interface was not showing at all and somehow poking around it did get LTE connection and I noticed that it was showing that even newer LTE firmware is available, I did update once again and now it is working great again.

Long story short for anyone else who might get something similar - my solution was to update LTE firmware and routerOS.

BTW how do I mark the thread as solved?

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