It seems to be working now. Here's what I am doing:
Copy every button flow one by one into notepad, then do a search/replace for lightstate/lighstate_n.
Done two and it seems like I've overlooked one or two when messing around with the manual _n addon.
Thanks for encouragement!
Here is my final attempt at this. I have buttons that switches color when they are pushed and when MQTT sends a confirmation on state change. The ON is further enhanced by a LED which turns on (green in this case). Furthermore I've added a slider that can control the dimming function of the Shelly RGBW2's I am using, and for clarity I've added a text field to show the dimming value.
I've attached a flow with 4 butons/sliders. In order to expand, the global lightstat_1_n function needs to be incremented to avoid confusion between buttons. I am currently running 12 and it works like a charm. Merry Christmas and thanks to "Santas helpers" for pointing in the right direction!
Here is the flow:
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proccessing"]},{"id":"874d11a1.d8385","type":"debug","z":"932c9a5e.6c66f8","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":636,"y":189,"wires":[]},{"id":"61c33cb5.28a7d4","type":"ui_led","z":"932c9a5e.6c66f8","group":"c6364af0.be9fe8","order":20,"width":1,"height":1,"label":"","labelPlacement":"left","labelAlignment":"left","colorForValue":[{"color":"green","value":"true","valueType":"bool"},{"color":"","value":"false","valueType":"bool"}],"allowColorForValueInMessage":false,"name":"","x":462,"y":187,"wires":[]},{"id":"c4615c46.19a2b","type":"function","z":"932c9a5e.6c66f8","name":"determineButtonState","func":"// this function runs every time the MQTT message is arrived (previous node changed the state of light).\n// read the state (if not set somehow, let assume it is false)\nvar state = global.get(\"lightstate_2_1\") || false;\nvar label;\nvar color;\n\nif(state === true){\n// state is true (lets make button green)\n label = \"Akterkoj\";\n color = \"#e3be8d\";\n}\nelse{\n // state is false (lets make button red)\n label = \"Akterkoj\";\n color = \"#f79f28\";\n}\n\n// send out message to button, this outgoing message only changes button visuals\nmsg = {enabled:true, topic:label, background:color};\nreturn msg;","outputs":1,"noerr":0,"x":167,"y":145,"wires":[["eb29fdb3.57cf6"]]},{"id":"80caea4b.50e5c8","type":"function","z":"932c9a5e.6c66f8","name":"store the state of light","func":"// read current state of light \nvar lightstate_2_1 = global.get(\"lightstate_2_1\") || undefined\nif(msg.payload === \"true\"){\n lightstate_2_1 = true\n}\nelse{\n lightstate_2_1 = false \n}\n// write state to global context, so we can read it where ever the state is needed\nglobal.set(\"lightstate_2_1\",lightstate_2_1)\n\n\n// return last known state (we dont use it but the flow must continue)\nmsg.payload = lightstate_2_1\nmsg.topic = \"state-of-light-changed\"\nreturn msg;","outputs":1,"noerr":0,"x":667,"y":105,"wires":[["c4615c46.19a2b"]]},{"id":"a9f30ddb.07403","type":"change","z":"932c9a5e.6c66f8","name":"","rules":[{"t":"change","p":"payload","pt":"msg","from":"true","fromt":"bool","to":"true","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":"false","fromt":"bool","to":"false","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":467,"y":105,"wires":[["80caea4b.50e5c8"]]},{"id":"46bb1adf.bf18d4","type":"change","z":"932c9a5e.6c66f8","name":"On/off 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pentry","color":"#030303","bgcolor":"{{msg.background}}","icon":"","payload":"lightstate_2_2","payloadType":"global","topic":"shellies/shellyrgbw2-B082AB/white/1/command","x":340,"y":336,"wires":[["3d017b43.7a7d34","e4724694.770f38","9f6916c3.5ee6f8","5de42dff.ba3ea4"]]},{"id":"3d017b43.7a7d34","type":"function","z":"932c9a5e.6c66f8","name":"buttonHandler","func":"//this function runs when you are pressing the button.\n\n// read current state of light\nvar state = global.get(\"lightstate_2_2\") || false;\n\nvar label;\nvar color;\n\nif(state === true){\n // current state is true (light is on) lets turn it off \n label = \"Pentry\";\n color = \"#f79f28\";\n}\nelse{\n // current state is false (light is off) lets turn it on \n label = \"Pentry\";\n color = \"#e3be8d\";\n}\n\n// buttonstate is message, which goes straight back to button. 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\"Pentry\";\n color = \"#e3be8d\";\n}\nelse{\n // state is false (lets make button red)\n label = \"Pentry\";\n color = \"#f79f28\";\n}\n\n// send out message to button, this outgoing message only changes button visuals\nmsg = {enabled:true, topic:label, background:color};\nreturn msg;","outputs":1,"noerr":0,"x":170,"y":336,"wires":[["c3173a8d.f0fe98"]]},{"id":"1a272ab1.cf1085","type":"function","z":"932c9a5e.6c66f8","name":"store the state of light","func":"// read current state of light \nvar lightstate_2_2 = global.get(\"lightstate_2_2\") || undefined\nif(msg.payload === \"true\"){\n lightstate_2_2 = true\n}\nelse{\n lightstate_2_2 = false \n}\n// write state to global context, so we can read it where ever the state is needed\nglobal.set(\"lightstate_2_2\",lightstate_2_2)\n\n\n// return last known state (we dont use it but the flow must continue)\nmsg.payload = lightstate_2_2\nmsg.topic = \"state-of-light-changed\"\nreturn msg;","outputs":1,"noerr":0,"x":670,"y":296,"wires":[["1fb7bdbb.5617e2"]]},{"id":"c1b0fd88.7f1f9","type":"change","z":"932c9a5e.6c66f8","name":"","rules":[{"t":"change","p":"payload","pt":"msg","from":"true","fromt":"bool","to":"true","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":"false","fromt":"bool","to":"false","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":470,"y":296,"wires":[["1a272ab1.cf1085"]]},{"id":"ca5fa623.c5da18","type":"change","z":"932c9a5e.6c66f8","name":"On/off 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motorrummet","color":"#030303","bgcolor":"{{msg.background}}","icon":"","payload":"lightstate_2_3","payloadType":"global","topic":"shellies/shellyrgbw2-B082AB/white/2/command","x":335,"y":531,"wires":[["b614a034.69aa4","eedf418d.d96c5","edeff632.909928","3fd86ec9.0651a2"]]},{"id":"b614a034.69aa4","type":"function","z":"932c9a5e.6c66f8","name":"buttonHandler","func":"//this function runs when you are pressing the button.\n\n// read current state of light\nvar state = global.get(\"lightstate_2_3\") || false;\n\nvar label;\nvar color;\n\nif(state === true){\n // current state is true (light is on) lets turn it off \n label = \"Motorrum\";\n color = \"#f79f28\";\n}\nelse{\n // current state is false (light is off) lets turn it on \n label = \"Motorrum\";\n color = \"#e3be8d\";\n}\n\n// buttonstate is message, which goes straight back to button. 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\"Motorrum\";\n color = \"#e3be8d\";\n}\nelse{\n // state is false (lets make button red)\n label = \"Motorrum\";\n color = \"#f79f28\";\n}\n\n// send out message to button, this outgoing message only changes button visuals\nmsg = {enabled:true, topic:label, background:color};\nreturn msg;","outputs":1,"noerr":0,"x":165,"y":531,"wires":[["42c468d8.550878"]]},{"id":"20b00bbd.b86804","type":"function","z":"932c9a5e.6c66f8","name":"store the state of light","func":"// read current state of light \nvar lightstate_2_3 = global.get(\"lightstate_2_3\") || undefined\nif(msg.payload === \"true\"){\n lightstate_2_3 = true\n}\nelse{\n lightstate_2_3 = false \n}\n// write state to global context, so we can read it where ever the state is needed\nglobal.set(\"lightstate_2_3\",lightstate_2_3)\n\n\n// return last known state (we dont use it but the flow must continue)\nmsg.payload = lightstate_2_3\nmsg.topic = \"state-of-light-changed\"\nreturn 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1 Like
Sorry @Ranur all there is in the flow is just a single function node.
Is that what you intended to post?
1 Like
Thank you Sir! No that was not my intention! The post is edited and the entire flow should be included. Ahh - the challenges of being a Node Red Virgin...
The drawback compared to my original post is that I have changed a bit in the color scheme to match my needs and changed text to Scandinavian - but hey - if I can work out code ANYONE can figure out some Scandinavian terms... 
Thanks again for the heads up!
Hi @Ranur - so nice to hear from someone in Scandinavia.
I had many wonderful trips to Copenhagen, Stockholm, Goteborg and Oslo years ago when I was conducting technical training sessions in Scandinavia.
