If OPC Router should act as a Kafka Consumer, the Kafka Trigger is used. A topic configured for the trigger, which is used by OPC Router to register as a subscriber in Kafka. The trigger activates its connection, in which it is configured, as soon as a new message is available for the topic. If several messages are available, the trigger is retriggered for each message. Even after a system restart, the trigger retrieves all messages not yet retrieved from broker.