Use DMXPY with a Transitions state machine

Question

I am trying to use DmxPy with a state machine written in Transitions but trying to pass the DmxPy to the finite state machine is throwing a metaclass error. It seems output of DmxPy is a Nonetype which is not running within the Transitions state machine.

Does anyone know how to get the following simplistic, non-functioning script working or a variation to cause a light to turn on depending upon the state we are in?

class DmxPy:
def __init__(self, serialPort):
    self.serial =serialPort(serialPort, baudrate=57600)
    ...other DMX code...

    def set_red(self, channel)
    ...RGBW color red mix...

def set_green(self, channel)
    ...RGBW color green mix...

def render(self)
    self.serial.write(...DMX code...)

The above is simplistic but to run it would be

dmx = DmxPy('COM5')
dmx.set_red(1)
dmx.render()

or

dmx = DmxPy('COM5')
dmx.set_red(1)
dmx.render()

The Transitions state machine code example, non-functional code is

class State:
    pass

classFSMOpen(State, DmxPy):
    dmx = DmxPy('COM5')
    dmx.set_red(1)
    dmx.render()

classFSMClosed(State,DmxPy):
    dmx = DmxPy('COM5')
    dmx.set_green(1)
    dmx.render()

classFSM(object)
    ...creation of the FSM...

From the above code, I am receiving a TypeError: metaclass conflict and when I check the type of the DmxPy run code, it tells me it's a <class 'NoneType'>.

So, how can I use the DmxPy code within the FSM to change a light based on the state of the FSM? Or, does anyone have a better idea?

score 0 · Answer 1 · answered May 25 '20 at 23:45

I have ciphered a way to make the code work, just not why. And I'm smart enough to not care at this point until the next time it breaks.

I simply changed the two classes by removing the call to the DmxPy code like so

class State:
    pass

classFSMOpen(State):
    dmx = DmxPy('COM5')
    dmx.set_red(1)
    dmx.render()

classFSMClosed(State):
    dmx = DmxPy('COM5')
    dmx.set_green(1)
    dmx.render()

classFSM(object)
    ...creation of the FSM...

If someone has reason this worked, I'm all ears.

Use DMXPY with a Transitions state machine

1 Answers1