import os.path
import serial
import time
import random
import logging

  
port_addr = '/dev/ttyACM0'

logging.warning("Staring up")

if os.path.exists(port_addr):
    port = serial.Serial(
        port=port_addr,
        baudrate=115200,
        bytesize=serial.EIGHTBITS,
        parity=serial.PARITY_NONE,
        stopbits=serial.STOPBITS_ONE,
        timeout=1,
        xonxoff=False,
        rtscts=False,
        dsrdtr=False,
        write_timeout=None,
        inter_byte_timeout=None)

    logging.warning("Opening port")

    time.sleep(2)

    logging.warning("Opened port")

    val1 = random.randint(0,100)
    val2 = random.randint(0,100)

    logging.warning("Staring with values %d and %d", val1, val2)

    while True:
        val1 += random.randint(-10,10)
        val2 += random.randint(-10,10)
        if val1 < 0:
            val1 = 0
        if val1 > 100:
            val1 = 100
        if val2 < 0:
            val2 = 0
        if val2 > 100:
            val2 = 100

        message = bytearray(3)
        message[0] = 0xFF
        message[1] = val1
        message[2] = val2

        port.write(message)

        time.sleep(0.01)