If you use the Arduino IDE to program the ESP32, you might be interested in [Andreas Spiess’] latest video (see below). In it, he shows an example of using all three ESP32 UARTs from an Arduino ...
Today Arduino has announced the availability of the new Arduino IDE in the form of version 1.6.8, which is now available with updated cores for almost all supported platforms including : AVR 1.6.10, ...