@Roalnd-Baldin
Thanks. Also your analysis may be spot-on. The current applications indeed waits for the database. In general this goes well within 1 sec. But while typing this I just realize that it tends to happen mostly when a number of devices report at the same about time. And the thing is single threaded. So queueing it will be.

Hi all:

Uplink messages are delivered in json to my application like:

{
	"reports": [
		{
			"serialNumber": "IMEI:357518080495880",
			"timestamp": 1611055046615,
			"subscriptionId": "*******",
			"resourcePath": "uplinkMsg/0/data",
			"value": "02010ff39 .. shortened .."
		}
	]
}

Sometimes I get this message multiple times. At first I thought it was my device sending the same data twice. But the timestamp comes from T-Mobile (I think), and stays the same. They are 100% duplicated.

Why does this happen. How can I prevent this?
A properly formatted message (and they are) is answered with RC=200 by my application.

Thanks.

@stefan-de-lange Thanks Stefan. Unfortunately this wasn’t built into the application. And it happened in just about the east-most part of the country and we are based in the west. So just trying will cost me hald a day. Perhaps I will put it into the application and log it into flash. But that won’t help us now.

Was hoping for one of the T-mobile guys (@Eric-Barten12 @Eric-Barten) to peek into the network log files to check if something was down in the Babberich area on June 3rd around noon. We had the issue on 4 separate devices and they worked again back home. According to the map I found just after posting we should have normal in house coverage, which should be quite ok.

@felixdonkers He doesn’t work for T-Mobile anymore. One wonders if there is causality in play

I have found the coverage map.
And Babberich was on it with normal in house coverage reported.
So why could not a single of 4 devices (Sodaq Sara 211) connect. Was there a network outage?

Is there a coverage map available for the NB/IoT network?

Yesterday a collegae travelled alk the way to Babberich (near Zevenaar and Lobith on the German border) just to discover that there was no coverage. Would be nice to know this in advance.

Also, Babberich being so close to Germany, could it be that T-Mobile DE offers NB service there? And if so, is there roaming or do we need new SIMs?