D-Spy
D-Bus explorer and test app for GNOME
D-Spy is a simple tool to explore D-Bus connections.
D-Spy is a tool to explore and test end-points and interfaces on the System or Session D-Bus. You can also connect to D-Bus peers by address. . D-Spy was originally part of the GNOME Builder app.
How to install D-Spy in Ubuntu
If you are on a supported distro, you can install the application through software center by clicking the below link.
If the above link not working, run the below command in terminal to install d-spy in Ubuntu
sudo apt install d-spy