Actually BACnet4J uses Simple Logging Facade for Java (SLF4J) https://www.slf4j.org. In Mango we use the Log4J binding and configure BACnet4Js logging via Log4J.

However if you are only using BACnet4J with no additional logging library you can configure the SLF4J loggers by including a binding. Some bindings require configuration but if you just want to discard all logging messages place the NOP binding on your class path.

See this link https://www.slf4j.org/manual.html#swapping for the various bindings you can choose, all you need to do then is put 1 of these bindings on your class path and configure it if the binding requires it.