fix out of memory crush, when there are no data to read on unix systems

[Kiliar]

You can improve pulling logic on unix systems, by changing recursion to endless loop with some delay.

[skadisch]

This will unfortunately not solve my problem, which is USB serial port disconnect. In this case, read will return 0, not an error. So this loop will run endlessly.

[Kiliar]

Oh.... so you have an issue when serial connection is up, but no data can be send or received using this lib? I had a similar issue and found a workaround by calling simple python script that will initialize serial port & send some data. It helps me most of the time, maybe it will help you to find proper solution.

import sys
import serial
import crc8

serial = serial.Serial()
serial.port = sys.argv[1]
serial.baudrate = int(sys.argv[2])

serial.open()

msg = bytearray.fromhex("0101")

hash = crc8.crc8()
hash.update(msg)
c = hash.digest()
serial.write(msg)
serial.write(c)