Hello,
Please format your code as per “Is your post formatted?”:
https://discourse.processing.org/t/guidelines-tips-on-asking-questions/2147/4
Otherwise we can’t easily cut and past to test code; quotes are always a problem.
The Processing code posted is fine.
I can receive the data on a terminal (puTTY) and other Processing application.
Please post your formatted Arduino code (minimal) and I will take a look.
