int inByte;                     // Byte read from Serial1

void setup() {
    // Initialize Serial1
	Serial.begin(115200); // Ignored by Maple. But needed by boards using hardware serial via a USB to Serial adaptor
    Serial1.begin(115200);
}

void loop() {
    // Read from Serial1, send over USB on Maple (or uses hardware serial 1 and hardware serial 2 on non-maple boards:
    if (Serial1.available()) {
        inByte = Serial1.read();
        Serial.write(inByte);
    }
}