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README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html

main.cpp

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+#include <Arduino.h>
+
+#define EXTERNAL_RX_PIN 16 // GPIO pin for the external device's TX
+#define EXTERNAL_TX_PIN 17 // GPIO pin for the external device's RX
+#define BAUD_RATE 115200
+
+void setup() {
+  // Initialize communication with the computer (via USB-to-UART chip)
+  Serial.begin(BAUD_RATE); 
+  
+  // Initialize communication with the external device (on designated GPIO pins)
+  Serial2.begin(BAUD_RATE, SERIAL_8N1, EXTERNAL_RX_PIN, EXTERNAL_TX_PIN);
+}
+
+void loop() {
+  // Read from computer (Serial) and send to external device (Serial2)
+  if (Serial.available()) {
+    Serial2.write(Serial.read());
+  }
+
+  // Read from external device (Serial2) and send to computer (Serial)
+  if (Serial2.available()) {
+    Serial.write(Serial2.read());
+  }
+}

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32dev]
+platform = espressif32
+board = esp32dev
+framework = arduino
+monitor_speed = 115200