waiting to receive message
1578122393.18: received 37 bytes from ('119.31.119.XXX', YYYYY)
1578122393.18: my signal csq: 22 rssi: -69dBm seq: 1
1578122393.18: sent 25 bytes back to ('119.31.119.XXX', YYYYY)

waiting to receive message
1578122398.14: received 37 bytes from ('119.31.119.XXX', YYYYY)
1578122398.14: my signal csq: 23 rssi: -67dBm seq: 2
1578122398.14: sent 25 bytes back to ('119.31.119.XXX', YYYYY)

waiting to receive message
1578122403.25: received 37 bytes from ('119.31.119.XXX', YYYYY)
1578122403.25: my signal csq: 25 rssi: -63dBm seq: 3
1578122403.25: sent 25 bytes back to ('119.31.119.XXX', YYYYY)

waiting to receive message
1578122408.17: received 37 bytes from ('119.31.119.XXX', YYYYY)
1578122408.17: my signal csq: 23 rssi: -67dBm seq: 4
1578122408.17: sent 25 bytes back to ('119.31.119.XXX', YYYYY)

waiting to receive message
1578122413.29: received 37 bytes from ('119.31.119.XXX', YYYYY)
1578122413.29: my signal csq: 23 rssi: -67dBm seq: 5
1578122413.29: sent 25 bytes back to ('119.31.119.XXX', YYYYY)

waiting to receive message
1578122418.24: received 37 bytes from ('119.31.119.XXX', YYYYY)
1578122418.24: my signal csq: 23 rssi: -67dBm seq: 6
1578122418.24: sent 25 bytes back to ('119.31.119.XXX', YYYYY)

waiting to receive message
1578122423.36: received 37 bytes from ('119.31.119.XXX', YYYYY)
1578122423.36: my signal csq: 23 rssi: -67dBm seq: 7
1578122423.36: sent 25 bytes back to ('119.31.119.XXX', YYYYY)

waiting to receive message
1578122428.32: received 37 bytes from ('119.31.119.XXX', YYYYY)
1578122428.32: my signal csq: 23 rssi: -67dBm seq: 8
1578122428.32: sent 25 bytes back to ('119.31.119.XXX', YYYYY)

"""
NB-IoT First Test Code
Listens on a port for UDP, simple authentication, echo back with unix time
Version 0.11 4 January 2020
Neo wwww.unix.com
"""
import socket
import sys
import time

# Create a TCP/IP socket
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
# sock.setblocking(False)
port = 22222          
# Bind the socket to the port
server_address = ('www.myudpserver.com, port)
print >>sys.stderr, 'starting up on %s port %s' % server_address
sock.bind(server_address)
password = "my_simple_password\n"
authenticated = True
receivepw = True
lastsent = 0

while True:
    print >>sys.stderr, '\nwaiting to receive message'
    now = time.time()

    data, address = sock.recvfrom(4096)
    print >>sys.stderr, str(time.time()) + \
        ': received %s bytes from %s' % (len(data), address)
    stuff = str(time.time()) + ": " + data
    print >>sys.stderr, stuff

    # override simple authentication
    if data:
        lastsent = time.time()
        if authenticated == False and receivepw == False:
            sent = sock.sendto("Password: ", address)
            receivepw = True
        elif receivepw == True and authenticated == False:
            if data == password:
                sent = sock.sendto("Authenticated\n", address)
                authenticated = True
            else:
                sent = sock.sendto("Password:\n", address)
            print >>sys.stderr, 'a: sent %s bytes back to %s' % (sent, address)
        elif authenticated == True:
            received = "You sent: " + data
            sent = sock.sendto(received, address)
            data = time.time()
            data = "Unix Time: " + str(data)+"\n"
            sent = sock.sendto(data, address)
            print >>sys.stderr, str(
                time.time())+': sent %s bytes back to %s' % (sent, address)
        else:
            sent = sock.sendto("Error\n", address)
            print >>sys.stderr, str(time.time())+' : sent %s bytes back to %s' % (sent, address)