We have a solution that uses a RouterBOARD RB951G-2HnD and a tablet. The mobile device has two applications running that consume web services on the same server. The first one communicates to the port 5555 while the second one to the port 80. For simplicity, let’s call them the 5555’s app and the 80’s app.
The 80’s app works on background and consumes its services periodically every minute. On the other hand, the 5555’s app works on foreground and consumes its services periodically every second. Both of them synchronize with the same server for different reasons with different periodicity.
Everything works great on the majority of our products but we’ve found that on a couple of them, we are having problems with the 80’s app (not per-se but the result).
On those, the 80’s app stops synchronizing with the server on a certain moment and doesn’t work again until you reboot the RouterBOARD or desable and re-enable its WLAN interface. After that, the 80’s app will start synchronizing again without toching the device or the app.
A little bit of additional information:
The tablet appears registered on the Wireless > Registration table with an Uptime of days and a Last Activity less than 1.0.
On the Connections table (IP > Firewall), you can see the 555’s app connections but the 80’s app connections never appear.
A Telnet connection to the server on the port 80 will can be successfully.
The 80’s app is disigned to run persistently on background and tries to synchronize with the server once a minute regardless if the device has an active network connection. If it doesn’t have one or if it fails to synchronize, it will try again a minute later.
The fact that we have docens of sites with this solution working properly and that only a couple of them present this issue, plus the fact that the problem is solved by rebooting the Mikrotik or its WLAN interface, makes me think that the 80’s app is not the problem but something related to the routerboard.
Any advise on how to diagnose any further this problem or any information or ideas will be deeply appreciated.
Which RouterOS version and firmware version is that 951G running?
Do all systems use the same tablet model with same OS version?
On the affected 951, in its registration table, what’s the CCQ of the tablet?
A Telnet connection to the server on the port 80 will can be successfully.
A telnet connection from where? From the 951 or from the tablet?
The fact that we have docens of sites with this solution working properly and that only a couple of them present this issue, plus the fact that the problem is solved by rebooting the Mikrotik or its WLAN interface, makes me think that the 80’s app is not the problem but something related to the routerboard.
Thanks for answering. Next are my answers to your questions:
Which RouterOS version and firmware version is that 951G running?
RouterOS 5.25. I have no idea how to check the firmware version. How do I retrieve it?
Do all systems use the same tablet model with same OS version?
Do all sites have the same devices?
We only use to types of tablets (only two part-numbers in total), so each site has one of the two types of tablets we use. Each type of tablet has exactly the same firmware, so they same OS version.
A telnet connection from where? From the 951 or from the tablet?
A telnet connection made from the 951.
On the affected 951, in its registration table, what’s the CCQ of the tablet?
I’ll check next time it happens.
Do you have any idea or advice on how can I troubleshoot this issue?
Pukkita, I have the answer to the question what is the CCQ of the tablet. It’s 14-15%. Sometime it goes up to 20-30% but only for a very brief period of time.
The same happens with the value of P Throughput. It varies between 900-1500kbps but for briefs periods of time, it goes up to 7.000kbps or 14.000kbps.
Next I present a screenshot showing the values:
sala 9.7.PNG
Do other wireless devices work fine with that 951 (CCQ > 85% when passing traffic)?
With that same 951, but using a different tablet (same hardware and software as the one is experiencing problems) do you get that CCQ also?
If so, the problem is either the scenario (spectrum) or the 951.
If the problem is solved when using a different tablet (same hardware and software) , it could be a hardware problem on the original tablet: bad radio, loose antenna inside, whatever.
Do other wireless devices work fine with that 951 (CCQ > 85% when passing traffic)?
With that same 951, but using a different tablet (same hardware and software as the one is experiencing problems) do you get that CCQ also?
We have only one device per 951 so there’s no way to know other than changeing it, which we would like to leave it a last resort.
Given that this is happening on three different sites, with their 951 and their tablet, this wouldn’t help much. Two sites have one type of tablet and the last one uses the other, so it’s not a problem of a particular tablet model.
Why do you say it’s a Wifi problem? I do not know what the CCQ means but just by looking at the signal strength and the signal to noise ratio I would say that the wifi is doing fine, but again, I’m no expert on wifi. Could you elavorate a little bit more on why do you think it’s a wireless issue and what other tests can I perform to be sure that’s the case?