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I wanted to understand this discussion, but to do so I needed to review Processing and JavaScript syntax. The three dots in the Processing code were puzzling until I found this very nice post: ...
It seems that v. 14 has resolved most of these problems
&[Wolfram Notebook][1] [1]: https://www.wolframcloud.com/obj/6601ee70-8105-4127-b16c-5717b9e86063
I am not a rdp expert but I had similar problems trying to run rdp with smalltalk on a linux amazon box to a macintosh. I found VNC worked well. You may want to try vnc to your pi. But this is just a guess .
I assume I can also set data bits, stop bits, parity by adding elements to the list. Do you know of anyone who has used Wolfram Language to communicate with firmata? The protocol for doing so seems quite opaque to me, but obviously many people...