# create Devices on the network
        self.Fosset = self.Network.add_device(21,
                                              "int Command;" +
                                              "byte Flow;" +
                                              "int Temp;",
                                              "Fosset")
        self.UnderTub = self.Network.add_device(22,
                                                "int Command;" +
                                                "int PipeTemp;" +
                                                "int HotTubTemp;" +
                                                "int OutsideTemp;" +
                                                "bool ValveIsOpen;" +
                                                "int OverflowTemp",
                                                "UnderTub")
        self.Fosset.add_translation('Command',
                                    ('Unfreeze', 2101),
                                    ('Regulate', 2102),
                                    ('Status', 99))
        self.UnderTub.add_translation('Command',
                                      ('Status', 99),
                                      ('OpenValve', 2201),
                                      ('CloseValve', 2202))


# and later i use for example:
 def prevent_freezing(self):
        print "Here I come to save the day!... by preventing pipe freezing"
        d = self.UnderTub.send_and_receive('Status')  # get status from UnderTub
        if not d:   # if we don't get anything d will be None
            print "prevent_freezing <- UnderTub is not responding!!!"
        else:
            if d['OutsideTemp'] < 0:  # if there are freezing conditions
                if d['PipeTemp'] < 20:  # 20 means 2.0 °C
                    print "It's my time to shine! There'll be no pipe freezing today mister!"
                    if not d['ValveIsOpen']:
                        self.UnderTub.send('OpenValve')  # make sure valve is open
                    self.Fosset.send('Unfreeze')
                    # sending unfreeze means it will send hot water through for 60 seconds