i have a diy infrared mailbox/Briefkasten Sensor, he send his data OTA to a MQTT Server, and with the simple mqtt plugin pimatic read this status. Ok here my Rules:

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If it possible to put the last two rules together? I mean i.e.:+1:

IF $Mailbox.Status changed THEN set $mailboxstatus to [ $Mailbox.Status == 1 ? "filled" : "been emptied" ]