Stream audio from trusdx over serial port

streamaudio.py

#!/usr/bin/env python3

import serial
import time
import pyaudio
import threading
import time

ser = serial.Serial("/dev/ttyUSB0", 115200)
stream = pyaudio.PyAudio().open(format = pyaudio.paInt8, channels = 1, rate = 7820, output = True)

time.sleep(5)
ser.write(b"UA1;")

buf = []

def serial_writer(serport):
    while True:
        d = serport.read(500)
        buf.append(d)

def audio_reader(pastream):
    while True:
        if len(buf) < 5:
            print("UNDERRUN - refilling")
            while len(buf) < 10:
                time.sleep(0.01)
        pastream.write(buf[0])
        buf.remove(buf[0])

threading.Thread(target=serial_writer, args=(ser,)).start()
threading.Thread(target=audio_reader, args=(stream,)).start()