Compute attribute to generate event when value change compared by last value

Hello

I have Teltonika FM6320 connected on tachygraph of truck and I try to implement compute attribute to generate event when driver is changing.

Attribute for the driver card is io195 and io196.
I use this in mysql to decode it :

CAST(UNHEX(concat(CONV(JSON_EXTRACT(attributes, '$.io195'),10,16),CONV(JSON_EXTRACT(attributes, '$.io196'),10,16))) AS CHAR)

Can you tell me if it's possible to set up compute attribute to generate event when the value change compare by last value ?

Thanks

Unfortunately there is no access to the last known location in computed attributes.

Thanks Anton,

In fact as you say, unfortunately.

But can you tell me if i can set up compute attribute to generate event (in table tc_events) each time event 184 (in table tc_positions) is fired ?

That should be possible.

Can you help to do it ?

I don't realy understand how compute attribute working to generate record in table tc_events.

Thanks

You need to return alarm as the expression result.

You mean that i must choose "alarm" in "attribute" parameter of Computed Attribute ?

Hey, Dez
I want to resolve the same issue too .. you have some solution or example ??

Thank you
George