UART: Communicating with Modules

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#include <HardwareSerial.h>

HardwareSerial GPSSerial(1);
void setup() {
  Serial.begin(115200);
  GPSSerial.begin(9600, SERIAL_8N1, 16, 17);
}
void loop() {
  if (GPSSerial.available()) Serial.write(GPSSerial.read());
}