https://www.rncbc.org/drupal/node/677 says the two (qmidinet & rtpMIDI ) ain’t compatible . .
The qmidinet implementation on the zynth is pretty simple. I would have previously typed qjackctl a lot here, but patchage is now easily available and makes for a nice alternative.
You need to ssh onto your zynth then on the command line
: apt install patchage.
Then simply run patchage . . .
Here you see my zynthian-motor.local doings it’s thing . . .
And as you can see Qmidinet is on channel one for input and output from the zynth.
So ANY device that talks to a device qmidinet channel 1 is going to transfer ALL the MIDI data to the zynthian to be implemented, and likewise any MIDI data from the zynth routed to the netwrk port will be transfered back.
So to connect your zynth to any device on your PC/MAC/Pi/Qmidinet Device simply select the qmidinet port as an output device.