client.py

import socket
import sys
import traceback
import datetime
import pytz

def log(msg):
    msg = (datetime.datetime.now(pytz.timezone('UTC')).isoformat() + " " + msg)
    print(msg, file = sys.stdout, flush = True)

# Create a UDS socket
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)

# Connect the socket to the port where the server is listening
server_address = './uds_socket'
log('connecting to {}'.format(server_address))
try:
    sock.connect(server_address)
except Exception as e:
    log('Exception: {}'.format(traceback.format_exc()))
    sys.exit(1)
sock.settimeout(3)

try:
    # Send data
    message = 'This is the message.  It will be repeated.'
    log('sending "{}"'.format(message))
    sock.sendall(message.encode())
    log("done sending")

    amount_received = 0
    amount_expected = len(message)

    while amount_received < amount_expected:
        data = None
        try:
            data = sock.recv(16)
        except Exception as e:
            log("failed to recv")
            raise e

        amount_received += len(data)
        log('received "{}"'.format(data))

finally:
    log('closing socket')
    sock.close()

client_output.txt

$ python3 client.py
2020-08-25T01:03:07.759512+00:00 connecting to ./uds_socket
2020-08-25T01:03:07.759824+00:00 sending "This is the message.  It will be repeated."
2020-08-25T01:03:07.759989+00:00 done sending
2020-08-25T01:03:10.763186+00:00 failed to recv
2020-08-25T01:03:10.763395+00:00 closing socket
Traceback (most recent call last):
  File "client.py", line 40, in <module>
    raise e
  File "client.py", line 37, in <module>
    data = sock.recv(16)
socket.timeout: timed out

server.py

import socket
import sys
import os
import select
import time
import datetime
import pytz

def log(msg):
    msg = (datetime.datetime.now(pytz.timezone('UTC')).isoformat() + " " + msg)
    print(msg, file = sys.stdout, flush = True)

server_address = './uds_socket'

# Make sure the socket does not already exist
try:
    os.unlink(server_address)
except OSError:
    if os.path.exists(server_address):
        raise

sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)

# Bind the socket to the port
log("starting up on {}".format(server_address))
sock.bind(server_address)
sock.settimeout(3)
sock.listen(10)
log("listening")
time.sleep(30)

server_output.txt

$ python3 server.py
2020-08-25T01:03:05.587219+00:00 starting up on ./uds_socket
2020-08-25T01:03:05.587611+00:00 listening