# Can I detect "error=device with matching FCnt not found" with mqtt api? **URL:** \ **Category:** v2 Backend\ **Created:** [February 19, 2019, 8:52am UTC](https://www.thethingsnetwork.org/forum/t/can-i-detect-error-device-with-matching-fcnt-not-found-with-mqtt-api/22915 "2019-02-19T08:52:16Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![ndarkness](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/ndarkness/32/20484_2.png) [@ndarkness](https://www.thethingsnetwork.org/forum/u/ndarkness)\ **Post date:** [February 19, 2019, 8:52am UTC](https://www.thethingsnetwork.org/forum/t/can-i-detect-error-device-with-matching-fcnt-not-found-with-mqtt-api/22915/1 "2019-02-19T08:52:16Z")
Hello, I am working with my a private lorawan stack based on the thing networks v2, I haven’t had time to update to the v3 yet, and I was wondering whether is possibe or not to detect the error _device with matching FCnt not found_ through the MQTT Management API. So, if I have this error `Feb 19 09:38:42 Broker[2153]: WARN Could not handle uplink AppEUI=XXXXXXXXXXXXX AppID=std DevAddr=XXXXXX DevAddrResults=1 DevEUI=XXXXXXXXXXXXX DevID=node1 Duplicates=1 FCnt=17 GatewayID=eui-XXXXXXXXXXXXX MICChecks=1 error=device with matching FCnt not found` Can I use the MQTT Management API to capture it or should I use the HTTP? I have tried to use the following subscription through mqtt node in node-red `std/devices/+/events/+` but I cannot see the error. Thanks in advance, Regards! ---
**Author:** ![system](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/6/2/6250ea44fd2b0d6259489e1a92748df681e1f970.png) [@system](https://www.thethingsnetwork.org/forum/u/system)\ **Post date:** [April 20, 2019, 8:52am UTC](https://www.thethingsnetwork.org/forum/t/can-i-detect-error-device-with-matching-fcnt-not-found-with-mqtt-api/22915/2 "2019-04-20T08:52:18Z")
This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.