So I’ve noticed that all the previous discussions regarding the use of COM ports, serial communication, arduino, etc. have all been using past versions of JUCE or through the use of external libraries.
With the amount of functions added to JUCE over the past couple of years, is there an optimal solution for achieving serial communication, or would I still need to be reliant on external libraries for handling such data?
You will still need to rely on external libraries.
I figured as much. Thanks 
Does your serial port code work well with JUCE 5?
Yes. Although it’s not my library, just one that I am using and maintaining.