This little Rust program emits CC messages to MIDI ports. Other programs like this exist, but I was bored.
It uses the midir library by @BoddInagg, so it should run on multiple platforms.
Run with --help for usage.
This program was created because I needed a method that could easily be called from a keybinding, to turn off the local keyboard connection of a synthesizer. This is typically done using MIDI CC#122.
So to turn off local control (on all ports),
cc-emitter "122:0"
and to turn it back on
cc-emitter "122:127"
Normally you would filter by port name to only affect specific devices. To list port names, run cc-emitter -l foo (foo is a dummy value to get around lazy argument parser handling, it will be ignored so can be anything)