Adds a button to the custom section <section-name> on the Screen Console Manager HUD. The section must have previously been created using add-section. <icon> should be the UUID for a white-and-transparent texture not exceeding 128x128 px. <command ...> may be multiple words, space-separated; in the event the button is pressed, it will be sent as a 1 COMMAND system command message to the controller with the console as the executing user.

If add-button fails, the device will be sent an add-button-fail message; otherwise it will receive add-button-confirm.

There is no way to remove or modify a button or section from the Screen Console Manager once it has been added.