How to add trigger that fires if mqtt item has value for specific duration?

[admin@hilton]

I have an mqtt item `mqtt.get[,"fitness_room/online"]` that is Numeric and only have the values 1 and 0.

I now want a trigger that fires if the value is 0 for 5 minutes (then the device is offline for more than 5 minutes).
I tried the following:
```
max(/Fitness Room ESP/mqtt.get[,"fitness_room/online"],5m)=0
```
but this fires even if the value is 0 for just a second. I guess the problem is that there is no other value in the last 5 minutes so 0 is the only value (even if the previous value was 1).

[cyber]

How often do you check? Your expressions seems fine, if you check more often that 5m ... it is a rolling 5m window, what is considered, so it should only fire after 5m of 0-es is there.. if you only check once in 10m then yea, it will trigger pretty much right away.

[admin@hilton]

> How often do you check?

Do you mean how often I check/pull the value? Since the value of the mqtt key is provided via an active agent I have no control over it. A value is only send if the state changes, so when the devices goes offline or online.

[admin@hilton]

I think I could use the following:
```
last(/Fitness Room ESP/mqtt.get[,"fitness_room/online"])=0
and
nodata(/Fitness Room ESP/mqtt.get[,"fitness_room/online"],5m)
```

[cyber]

Sry, I totally overlooked, that the mqtt thing is not the normal polling thing..

nodata(/host/item,5m)=1 then. Function has to have some kind of value... 1 or 0 in this case...

[admin@hilton]

From https://www.zabbix.com/documentation...istory#nodata:

Returns: 1 - if no data received during the defined period of time; 0 - otherwise.

So `nodata(...)` and `nodata(...) = 1` are the same.