This documentation is for an unreleased version of MPF!

This is the developer documentation for MPF 0.54, which is the “dev” (next) release of MPF that is a work-in-progress. Use the “Read the Docs” link in the lower left corner to view the developer docs for the version of MPF you’re using.

trigger (BCP command)

This command allows the one side to trigger the other side to do something. For example, the pin controller might send trigger commands to tell the media controller to start shows, play sound effects, or update the display. The media controller might send a trigger to the pin controller to flash the strobes at the down beat of a music track or to pulse the knocker in concert with a replay show.


Pin controller or media controller



Type: string

This is the name of the trigger.


Trigger messages may contain any additional parameters as needed by the application.