set_urg_ip.py

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#!/usr/bin/env python

# Copyright (c) 2014 Unbounded Robotics Inc. 
# All right reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#   * Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
#   * Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#   * Neither the name of Unbounded Robotics Inc. nor the names of its 
#     contributors may be used to endorse or promote products derived 
#     from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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"""
Change the IP address of a Hokuyo URG Laser
"""

import argparse
import socket

def parse_and_validate_ipv4(argument, name):
    """
    Each address must have 4 
    """
    if len(argument.split(".")) != 4:
        print("Invalid %s, must be of the form xxx.yyy.zzz.www" % name)
        exit(-1)
    parsed = ""
    for x in argument.split("."):
        if len(x) > 3:
            print("Invalid %s, must be of the form xxx.yyy.zzz.www" % name)
            exit(-1)
        while len(x) < 3:
            x = "0" + x
        parsed += x
    return parsed

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('new_ip', help='The desired IP address for the laser')
    parser.add_argument('new_gw', help='The desired gateway for the laser')
    parser.add_argument('--nm', help='The desired netmask for the laser', default="255.255.255.0")
    parser.add_argument('--ip', help='The current IP address of the laser', default="192.168.0.10")
    args = parser.parse_args()

    # Packet starts with $IP, ends with \x0a, contains:
    #   12 character IP
    #   12 character netmask
    #   12 character gateway
    ip = parse_and_validate_ipv4(args.new_ip, "IP address")
    gw = parse_and_validate_ipv4(args.new_gw, "gateway address")
    nm = parse_and_validate_ipv4(args.nm, "netmask")
    msg = "$IP" + ip + nm + gw + "\x0a"

    print("Connecting to %s" % args.ip)
    sock = socket.socket()
    sock.connect((args.ip, 10940))

    print("Updating settings")
    sock.send(msg)
    try:
        sock.settimeout(5)
        returned = sock.recv(40)
    except socket.timeout:
        print("Laser did not return any packet, is probably not updated.")
        exit(-1)
    if msg != returned:
        print("Laser does not appear to have updated")
        exit(-1)
    print("Done updating, cycle power on laser")