busctl

Introspect and monitor the D-Bus bus. More information: https://www.freedesktop.org/software/systemd/man/busctl.html.

• Show all peers on the bus, by their service names:
  busctl list
• Show process information and credentials of a bus service, a process, or the owner of the bus (if no parameter is specified):
  busctl status {{service|pid}}
• Dump messages being exchanged. If no service is specified, show all messages on the bus:
  busctl monitor {{service1 service2 ...}}
• Show an object tree of one or more services (or all services if no service is specified):
  busctl tree {{service1 service2 ...}}
• Show interfaces, methods, properties and signals of the specified object on the specified service:
  busctl introspect {{service}} {{path/to/object}}
• Retrieve the current value of one or more object properties:
  busctl get-property {{service}} {{path/to/object}} {{interface_name}} {{property_name}}
• Invoke a method and show the response:
  busctl call {{service}} {{path/to/object}} {{interface_name}} {{method_name}}