A bridge to comunicate with an UART connected to Serial1 Arduino

uart_bridge.ino

void setup() {
	Serial.begin(9600); // Arduino monitor
	Serial1.begin(9600); // connected UART
}

void loop() {
	while (true) {
		while (Serial.available()) Serial1.write(Serial.read());
		while (Serial1.available()) Serial.write(Serial1.read());
		delay(10);
	}
}