If you're interested in a simple way to look at messages by Fedora you can use either the attached python or Go scripts.
Step 1: Run Fedora
java -jar fcrepo-webapp-{fcrepo-version}-jetty-console.jar
Step 2: Setup message listener
Step 2a: Python ( listener-python2.py or listener-python3.py)
pip install stomp.py # for python 3.8 do the following: python listener-python3.py # for python2 do the following: python listener-python2.py
Step 2b: Go (fcr-listen)
chmod +x /usr/local/bin/fcr-listen ./fcr-listen