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Now for your first question, I don't know about doing it with arduino, but if you manage to find resources to send simple midi messages, it'll be the same thing to send MPE messages as well. As to what messages you should actually send however, I used this to understand how to send pitch bend range information, and learned the rest from the spec and a bit of tinkering. You can check out the source code of my custom piano roll which uses MPE to send notes with arbitrary frequencies. The relevant parts are the setup_mpe method, which just has to run once in the beginning to setup the synth to which you're connected. The other ones are note_on and note_off. (sidenote: actually here I'm not using the least recent channel because I was lazy when I wrote this, but)