Initial commit

src/main.cpp

@@ -0,0 +1,25 @@
+#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());
+  }
+}