Using MMC from external device to start/stop Jack transport?

[mvdev0]

It would be nice start/stop the transport only and forget the external clock from BSP or other external devices/DAW..

I just found http://jackctlmmc.sourceforge.net/ , but do we not have a plugin in the main repositories that doing the same?

[j_e_f_f_g]

start/stop the transport

You don't need any add-on to do that. Standard MIDI has "MIDI Start" (hex byte FA), "MIDI Continue" (FB), and "MIDI Stop" (FC) messages. They are part of MIDI's built-in "MIDI Clock" protocol. If the software you want to control can sync to "MIDI Clock", then it will respond to these 3 messages. Most sequencer programs directly support MIDI Clock sync. You don't need to involve jack transport at all. (And Jack Transport is just extra overhead you don't want.) But the software is almost guaranteed to also respond to MIDI Clock (F8) messages, and therefore its tempo will need to be controlled by the device sending those start and stop messages.

Depending upon what software you're trying to control, there's probably an easier way (albeit likely particular to that program) to do what you want. You should rephrase the question to reference the exact hardware/software you're using, because the best solution depends upon their features/limitations.