#!/usr/bin/env python

from subprocess import run

# requires pySerial:
# python -m pip install pyserial
import serial

# grab the port for the seeed nrf52 (only connect one at a time)
data = run("ls /dev/ | grep 'cu.usbmodem'", capture_output=True, shell=True, text=True)

ser = serial.Serial("/dev/" + data.stdout.strip(), 1200)
# send 16 null characters as reset signal to enter the bootloader
ser.write(b"\x00" * 16)
ser.close()