Send 1st msg, delay from value in context, send second msg

Hi all,

I am new in visual or real programming, so while I learning java script, I would appreciate some help from your side.
I need function node, which will say:

  1. send 1st message immediately when arrive to input
    • then
  2. delay second message with value from context (if 2nd message never arrive go to 1st step after delay countdown)
    • after
  3. release second message and set delay with new value from context (if 3th message never arrive go to 1st step after delay countdown)
  • repeat above if messages still arriving

Background:
I would like to control roller shutters with relay board (one relay for up and next one for down). Main problem, which I didn't solve yet is situation when I would like to open shutter and after close it too soon --> factory reset of shutter. I don t want that, because after shutter dont know where are its up or down limits!

Instead of UP, DOWN and STOP buttons I would like to have slider, thats why I have this issue for which I dont find any existing node (or if there any, I dont understand them (yet)). I tried with all nodes with word "blinds", "garage doors", "sun position" or all general nodes in Node red.

Below is flow, which I created till now, I would place function node after slider or before trigger nodes 01+// & 02+// which turning relays for up and down.

All comments related below flow are welcome!
Thanks in advance.

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