GPS for ESP32 T-Beam

#include <HardwareSerial.h>
#define GPS_SERIAL_NUM 1
#define GPS_RX_PIN 34
#define GPS_TX_PIN 12

HardwareSerial GPSSerial(GPS_SERIAL_NUM);

void setup() {
  Serial.begin(115200);
  GPSSerial.begin(9600, SERIAL_8N1, GPS_RX_PIN, GPS_TX_PIN);

  Serial.println("Hello GPS");
}

void loop() {
  if (Serial.available()) {
    char c = Serial.read();
    GPSSerial.write(c);
  }
  if (GPSSerial.available()) {
    char c = GPSSerial.read();
    Serial.write(c);
  }
}

BOARD?=esp32:esp32:t-beam
PORT?=/dev/cu.SLAB_USBtoUART

.PHONY: default lint all flash clean

default: all flash clean

lint:
	cpplint --extensions=ino --filter=-legal/copyright *.ino

all:
	arduino-cli compile --fqbn $(BOARD) ./

flash:
	arduino-cli upload -p $(PORT) --fqbn $(BOARD)

clean:
	rm -r build