Hubitat group devices do not support the commands startLevelChange and stopLevelChange even if the individual devices within the group support those commands - for example zigbee bulbs that use the new Advanced Zigbee Bulb drivers, or other devices that support these commands.
So I created this sequence to approximate startLevelChange and stopLevelChange for group devices that are exposed to Node-RED. It works really well for me using a Pico remote to control a group of two zigbee bulbs. No popcorning, no jerky changes in level.
It works by saving the level of the group device to a flow variable and using that to calculate msg.arguments in repetitive steps that are 200 milliseconds apart (i.e. approximating a "held" action for startLevelChange). Releasing the button resets the reiterative timer, thereby approximating a stopLevelChange.
Sequence code:
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