Does openHAB2 support Presets?

Setup, Configuration and Use Runtime
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6
  1. Switch/Case
    Another thread states that getting into trouble with switch/case and numbers.
    (Problem with case and switch in rules)

The solution was

Switch((Group_preset.state as DecimalType).intValue)
{
   case 1: {
           }
   case 2: {
           }
}

The problem is that the number item can be a float value and “1.0” is not the same as “1” for switch/case…

  1. Group_preset
    As far as I know, you can’t set an item to null. But if you use a number item, you can set it to Zero (0) which is different from null or uninitialized.
    I recommend use Zero (=0) instead of null.
    => as @rossko57 mentioned:
        Group_preset.postUpdate(0)

In your rule you can remove the if/else and just go with switch/case

Switch((Group_preset.state as DecimalType).intValue)
{
   case 0: {
             gLight.sendCommand(ON)
           }
   case 1: {
             gLight.sendCommand(OFF)
             Yeelight1_p.sendCommand(ON)
             Yeelight2_p.sendCommand(ON)
           }
   case 2: {
           }
}
  1. sendCommand
    It’s better to use the method of an item instead of the action. So use gLight.sendCommand(OFF) or Yeelight1_p.sendCommand(ON) instead of sendCommand(Yeelight1_p, ON)

The difference:
the method of the item knows exactly of what type the state is. The action has to guess the type of state and could be wrong…

Andreas