In the general RVR forum I asked some questions about the serial port. Here’s some more…
Repeat: what is the voltage on the serial port? The TX reads 3.3v. Is the RX limited to 3.3v or is 5v safe?
What is the speed of the port?
Can someone provide some basics on the protocol? Just enough to see if I have communications working, not the full API. Willing to help debug the API. Lots of experience with embedded systems.
Probably will start with desktop USB to serial port converter for testing and then switch to an Up Board which is a Linux based SBC. Will be using C++. Can port the Arduino libraries to more general use when they are available. That would make using C++ on the RPi possible.