Custom DIA device

I am trying to create a custom DIA device for controlling a hbridge. I can figure out the the SCI/RCI commands, but I thought it would be cleaner to create a custom device. The RCI is:

       5
       4
       5
       5

So I need to set all the pins to turn it on and flip dio0&1 to reverse polarity.

Following the sample for the smart plug I think I understand setting one pin using “def prop_set_power_control(self, bool_sample):”

Thank you in advance for any advice.