how create trigger for automatically return to OK state

[marquez]

Greetings,
I have small alarm device which sends smtp traps like:

- alarm OFF
SNMPv2-SMI::enterprises.42814.14.3.3.1.0 type=2 value=INTEGER: 0

- alarm ON
SNMPv2-SMI::enterprises.42814.14.3.3.1.0 type=2 value=INTEGER: 1

I see traps in Zabbix (I created items and see their value into "Latest data") but I want create trigger which goes into PROBLEM (alarm ON) state and automatically return to OK when received trap with alarm OFF.

Would someone be able to send a solution, a hint? I tried with SNMPVALUE, LLD I'm searching manuals but without success...