Deckset 1.5.0 introduces the ability to get a slide's notes and PDF data from the AppleScript interface, which means there's no need to manually export as PDF from Deckset, then drag and drop the PDF and markdown onto the DeckRocket menubar icon.
Instead, any time the "Send Slides" menu option is selected, the slides from the active Deckset document will be automatically rendered and sent to DeckRocket on iOS.
I've also added a global hotkey (control-option-command-P) to trigger this action from any app, as long as DeckRocket for Mac is running.