I happily use OSCII-Bot to communicate with a Midi Control surface (i.e. via Reaper, but directly would work just as well) and forward the messages to and fro via OSCII-Bot with a Rack Mixer.
To allow for this, the newer versions of OSCII-Bot (and AFAIK, also Reaper) feature a "dialogue" mode that allows for bidirectional communication by answering to a device without knowing it's IP address. ->
https://www.cockos.com/oscii-bot/oscii-bot-doc.html: "Note: in OSCII-bot v0.4+, you can send OSC messages to an OSC input device, which will send to the IP/port of the last message received. "
-Michael