hf.py

#!/usr/bin/env python3
import errno
import socket
import sys

from time import sleep

PORT = 48899
AUTH = 'HF-A11ASSISTHREAD'.encode()
OK = "+ok".encode()

target = sys.argv[1]

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(('', PORT))
s.setblocking(0)

def quit():
    print()
    sys.exit()

while True:
    try:
        msg = "AT+" + input('-> ') 
    except KeyboardInterrupt:
        quit()
    except EOFError:
        quit()
    s.sendto(AUTH, (target, PORT))
    s.sendto(OK, (target, PORT))
    sleep(.4)
    s.sendto((msg + '\n').encode(), (target, PORT))
    sleep(.4)
    data = ""
    while True:
        try:
            data += s.recv(1024).decode()
        except socket.error as e:
            if e.errno == errno.EWOULDBLOCK:
                break
            print(str(e)) 
    print('\n'.join(data.replace('\r', '').split('\n')[1:]))