How to use the plugwise.protocol.Int function in plugwise

def __init__(self, mac, idx):
        PlugwiseRequest.__init__(self, mac)
        self.args.append(Int(idx, length=2))

def serialize(self):
        fmt = "%%0%dX" % self.length
        return sc(fmt % self.value)

    def unserialize(self, val):
        self.value = int(val, 16)

class UnixTimestamp(Int):
    def __init__(self, value, length=8):
        Int.__init__(self, value, length=length)

    def unserialize(self, val):
        Int.unserialize(self, val)
        self.value = datetime.datetime.fromtimestamp(self.value)

class Year2k(Int):
    """year value that is offset from the year 2000"""

    def unserialize(self, val):
        Int.unserialize(self, val)
        self.value += PLUGWISE_EPOCH

class DateTime(CompositeType):
    """datetime value as used in the general info response
    format is: YYMMmmmm
    where year is offset value from the epoch which is Y2K
    and last four bytes are offset from the beginning of the month in minutes
    """

    def __init__(self, year=0, month=0, minutes=0):
        CompositeType.__init__(self)        
        self.year = Year2k(year-PLUGWISE_EPOCH, 2)

def __init__(self, seqnr = None):
        PlugwiseResponse.__init__(self, seqnr)
        self.exsisting = Int(0, 2)
        self.allowed = Int(0, 2)
        self.params += [self.exsisting, self.allowed]

def __init__(self, seqnr = None):
        PlugwiseResponse.__init__(self, seqnr)
        self.pulse_1s = SInt(0, 4)
        self.pulse_8s = SInt(0, 4)
        self.pulse_hour = Int(0, 8)
        self.pulse_prod_hour = SInt(0, 8)
        self.unknown2 = Int(0, 4)
        self.params += [self.pulse_1s, self.pulse_8s, self.pulse_hour, self.pulse_prod_hour, self.unknown2]

def __init__(self, seqnr = None):
        PlugwiseResponse.__init__(self, seqnr)
        self.time = TimeStr()
        self.day_of_week = Int(0, 2)
        self.date = DateStr()
        self.params += [self.time, self.day_of_week, self.date]

def __init__(self, mac, moduletype, timeout):
        PlugwiseRequest.__init__(self, mac)
        self.args.append(Int(moduletype, length=2))
        self.args.append(Int(timeout, length=2))

def __init__(self, seqnr = None):
        PlugwiseResponse.__init__(self, seqnr)
        self.features = Int(0, 16)
        self.params += [self.features]

def __init__(self, seqnr = None):
        PlugwiseResponse.__init__(self, seqnr)
        self.exsisting = Int(0, 2)
        self.allowed = Int(0, 2)
        self.params += [self.exsisting, self.allowed]

def __init__(self, mac, usage, production):
        PlugwiseRequest.__init__(self, mac)
        self.args.append(Int(usage, length=4))
        self.args.append(Int(production, length=4))

def __init__(self, mac, moduletype, timeout):
        PlugwiseRequest.__init__(self, mac)
        self.args.append(Int(moduletype, length=2))
        self.args.append(Int(timeout, length=2))