@David26  I am not familiar with this specific processor "Plc4xListenRecordProcessor 0.12.0".   I could not find it in Apache NiFi 1.x or 2.x versions.  I could find it in Maven Central either.  Where did you download this nar that you added to your NiFi? What version of Apache NiFi are you using? You may need to reach out to the originator of this custom nar you have added to you NiFi for this processor specific query. Please help our community grow. If you found any of the suggestions/solutions provided helped you with solving your issue or answering your question, please take a moment to login and click "Accept as Solution" on one or more of them that helped. Thank you, Matt ... View more