# If function returns duplicate msg
**URL:** https://discourse.nodered.org/t/if-function-returns-duplicate-msg/65134
**Category:** General
**Tags:** function-node
**Created:** [15 July 2022 09:56 UTC](https://discourse.nodered.org/t/if-function-returns-duplicate-msg/65134 "2022-07-15T09:56:38Z")
**Posts on this page:** 12
**Page:** 1
### Author:  [@pawael](https://discourse.nodered.org/u/pawael)
#### Post date: [15 July 2022 09:56 UTC](https://discourse.nodered.org/t/if-function-returns-duplicate-msg/65134/1 "2022-07-15T09:56:38Z")
Hi all,
I'm trying to learn more about functions so I created a function wich gets multiple information and compares all inputs to send a payload. Here is my code
```auto
context.cover_arzi_aussetzen = context.cover_arzi_aussetzen
context.cover_arzi_status = context.cover_arzi_status
context.cover_bazi_aussetzen = context.cover_bazi_aussetzen
context.cover_bazi_status = context.cover_bazi_status
if (msg.data.entity_id === 'input_boolean.arbeitszimmerrollo_aussetzen')
{
context.cover_arzi_aussetzen = msg.payload
}
if (msg.data.entity_id === 'cover.arzi_shlsht_fenster')
{
context.cover_arzi_status = msg.data.attributes.current_position
}
if (msg.data.entity_id === 'input_boolean.badezimmerrollo_aussetzen')
{
context.cover_bazi_aussetzen = msg.payload
}
if (msg.data.entity_id === 'cover.bazi_shlsht_fenster')
{
context.cover_bazi_status = msg.data.attributes.current_position
}
//----------------------------
if (context.cover_arzi_aussetzen === "off" && context.cover_arzi_status === 100)
{
msg.payload =
{"service": "notify", data:{"message":"Arbeitszimmer Aussetzen off, status 100"}}
return [msg,null]
}
if (context.cover_bazi_aussetzen === "off" && context.cover_bazi_status === 100)
{
msg.payload =
{"service": "notify", data:{"message":"Badezimmer Aussetzen off, status 100"}}
return [null,msg]
}
```
My problem is that I receive 4 times the notify Arbeitszimmer Aussetzen off, status 100 but no time Badezimmer Aussetzen off, status 100. All conditions match, if I only use the if function for Badezimmer I receive the notify 4 times for Badezimmer. Can someone help me out? What is my mistake? Of course I can use other nodes to solve this wich I currently using but on the one hand my flow is much too big and on the other hand I want to learn more about the function node as I wrote earlier.
I would appreciate any help.
Thanks in advance and cheers
PaWäl
---
### Author:  [@zenofmud](https://discourse.nodered.org/u/zenofmud)
#### Post date: [15 July 2022 10:49 UTC](https://discourse.nodered.org/t/if-function-returns-duplicate-msg/65134/2 "2022-07-15T10:49:51Z")
First off why are you setting these variables to themself's?
> [@pawael](#):
>
> ```auto
> context.cover_arzi_aussetzen = context.cover_arzi_aussetzen
> context.cover_arzi_status = context.cover_arzi_status
> context.cover_bazi_aussetzen = context.cover_bazi_aussetzen
> context.cover_bazi_status = context.cover_bazi_status
>
> ```
second are these suppose to be persistant variables? If so, you are doing it wrong and need to go read the documentation [Writing Functions : Node-RED](https://nodered.org/docs/user-guide/writing-functions#storing-data)
If not, where does that variable come from in the first place?
As to receiving for notifications, how many msg's are being sent to the `function` node? what is the data going into the `function` node?
---
### Author:  [@pawael](https://discourse.nodered.org/u/pawael)
#### Post date: [15 July 2022 14:05 UTC](https://discourse.nodered.org/t/if-function-returns-duplicate-msg/65134/3 "2022-07-15T14:05:41Z")
hi @zenofmud
thank you for your answer. I hope I can answer all your questions correctly. Before I opened this thread I tried to solve it myself googling for answers. In one "guide" I found a solution to set the variable by itself. So if I understand your question correctly this procedure seems to be wrong.
The variables must not be persistant because they will be "refilled" after a trigger starts.
Currently 4 Home Assistant current state nodes are going into the input connection. 2 of them with boolean on or off and 2 of them with all information that my device delivers. Because of this I set the msg.payload to msg.data.attributes.current\_position. In my honest opinion I was able to check both payloads if they are true. So the first part is to set the payload that I really want and the second part is the "logic" part. I hope you are able to understand my explanation as English is not my mother language.
---
### Author:  [@zenofmud](https://discourse.nodered.org/u/zenofmud)
#### Post date: [15 July 2022 17:29 UTC](https://discourse.nodered.org/t/if-function-returns-duplicate-msg/65134/4 "2022-07-15T17:29:44Z")
> [@pawael](#):
>
> In one "guide" I found a solution to set the variable by itself.
I'd really like to see that 'guide'.
BACKGROUND:
Context data is a way to share data between nodes without passing it in a message. There are three types: Global, Flow and Node.
With Global context, any node, in any flow, on any tab, can share the data
With Flow context, any node, in that flow can share the data
With Node context, any msg that comes thru the node that creates it, can access that data.
The word 'persistant' means it will exist to be used later, it does NOT mean it can never be changed. Let's say you want to count the number of msgs that go thru a `function` node. In the functio node you would do this
```auto
let count_m = flow.get("msg_counter") || 0;
count_m++;
flow.set("msg_counter", count_m);
```
The first line tries to get the flow context variable called 'msg\_counter' and it it doesn't exist, it sends a zero to the variable `count_m`.
Then next line increases the value of `count_m` by one.
The third line stores the value in `count_m` in the flow context variable `msg_counter`.
So each time a msg passes into this function node, the value is increased by one. So the 'variable' is persisant but the `value` it contains changes. (you can delete the variable by setting it's value to null.)
Now about your issue. Without seeing your flow, I don't know if one msg with all four current states go into the `function` node or if four seperate msg go into the `function` node. Each time a msg enters a node, the node has know knowledge of what has happened before. So if msg 1 goes into a `function` node, it does it's work and leaves. Now msg 2 comes along and enters the `function` node. There is nothing in the `function` node about msg 1, it is starting clean. If you stored some data in a context variable, this iteration of the `function` node could go get the stored context variable and use that along with the data in the current `function`.
I hope that helps you out. If you still need help, having a copy of your flow would allow us to see what you are doing.
If you need it, see [this article in the cookbook](https://cookbook.nodered.org/basic/join-streams) for an example of how to join messages into one object.
---
### Author:  [@pawael](https://discourse.nodered.org/u/pawael)
#### Post date: [16 July 2022 07:30 UTC](https://discourse.nodered.org/t/if-function-returns-duplicate-msg/65134/5 "2022-07-16T07:30:27Z")
Wow, thank you for your detailed explanation!
Currently 4 current state nodes go into the function node. In the function node I want to "extract" the payload I need (context.cover\_bazi\_status = **msg.data.attributes.current\_position** ) because the original payload is "open" but I need the number of current\_position. After comparing the 4 values I want so pass my new msg to 2 separate output, one for each device.
As I understand you correctly because of the 4 input nodes I have 4 times msg processing and therefor 4 times output?
Here is my flow:
```auto
[
{
"id": "38e4d6300fc6052d",
"type": "api-current-state",
"z": "6033c466a6e49c53",
"name": "CHK: Ist Rollo AZ aussetzen an?",
"server": "ddbd0338d04ff2f9",
"version": 3,
"outputs": 1,
"halt_if": "",
"halt_if_type": "str",
"halt_if_compare": "is",
"entity_id": "input_boolean.arbeitszimmerrollo_aussetzen",
"state_type": "str",
"blockInputOverrides": false,
"outputProperties": [
{
"property": "payload",
"propertyType": "msg",
"value": "",
"valueType": "entityState"
},
{
"property": "data",
"propertyType": "msg",
"value": "",
"valueType": "entity"
}
],
"for": 0,
"forType": "num",
"forUnits": "minutes",
"x": 1180,
"y": 1280,
"wires": [
[
"5d8cac5bf08eb163"
]
]
},
{
"id": "9f7097f6a82744bf",
"type": "api-current-state",
"z": "6033c466a6e49c53",
"name": "CHK: Ist Rollo BZ aussetzen an?",
"server": "ddbd0338d04ff2f9",
"version": 3,
"outputs": 1,
"halt_if": "",
"halt_if_type": "str",
"halt_if_compare": "is",
"entity_id": "input_boolean.badezimmerrollo_aussetzen",
"state_type": "str",
"blockInputOverrides": false,
"outputProperties": [
{
"property": "payload",
"propertyType": "msg",
"value": "",
"valueType": "entityState"
},
{
"property": "data",
"propertyType": "msg",
"value": "",
"valueType": "entity"
},
{
"property": "topic",
"propertyType": "msg",
"value": "rollos_garten_aussetzen",
"valueType": "str"
}
],
"for": 0,
"forType": "num",
"forUnits": "minutes",
"x": 1180,
"y": 1340,
"wires": [
[
"5d8cac5bf08eb163"
]
]
},
{
"id": "b826085b6b3c72d2",
"type": "api-current-state",
"z": "6033c466a6e49c53",
"name": "CHK: Ist Rollo AZ bereits geöffnet",
"server": "ddbd0338d04ff2f9",
"version": 3,
"outputs": 1,
"halt_if": "",
"halt_if_type": "str",
"halt_if_compare": "is",
"entity_id": "cover.arzi_shlsht_fenster",
"state_type": "str",
"blockInputOverrides": false,
"outputProperties": [
{
"property": "payload",
"propertyType": "msg",
"value": "",
"valueType": "entityState"
},
{
"property": "data",
"propertyType": "msg",
"value": "",
"valueType": "entity"
}
],
"for": 0,
"forType": "num",
"forUnits": "minutes",
"x": 1180,
"y": 1400,
"wires": [
[
"5d8cac5bf08eb163"
]
]
},
{
"id": "820d6d35d25f9547",
"type": "api-current-state",
"z": "6033c466a6e49c53",
"name": "CHK: Ist Rollo BZ bereits geöffnet",
"server": "ddbd0338d04ff2f9",
"version": 3,
"outputs": 1,
"halt_if": "",
"halt_if_type": "str",
"halt_if_compare": "is",
"entity_id": "cover.bazi_shlsht_fenster",
"state_type": "str",
"blockInputOverrides": false,
"outputProperties": [
{
"property": "payload",
"propertyType": "msg",
"value": "",
"valueType": "entityState"
},
{
"property": "data",
"propertyType": "msg",
"value": "",
"valueType": "entity"
},
{
"property": "topic",
"propertyType": "msg",
"value": "rollos_garten_status",
"valueType": "str"
}
],
"for": 0,
"forType": "num",
"forUnits": "minutes",
"x": 1180,
"y": 1460,
"wires": [
[
"5d8cac5bf08eb163"
]
]
},
{
"id": "5d8cac5bf08eb163",
"type": "function",
"z": "6033c466a6e49c53",
"name": "Rollosteuerung",
"func": "context.cover_arzi_aussetzen = context.cover_arzi_aussetzen\ncontext.cover_arzi_status = context.cover_arzi_status\ncontext.cover_bazi_aussetzen = context.cover_bazi_aussetzen\ncontext.cover_bazi_status = context.cover_bazi_status\n\n\nif (msg.data.entity_id === 'input_boolean.arbeitszimmerrollo_aussetzen')\n{\n context.cover_arzi_aussetzen = msg.payload\n}\nif (msg.data.entity_id === 'cover.arzi_shlsht_fenster')\n{\n context.cover_arzi_status = msg.data.attributes.current_position\n}\n\nif (msg.data.entity_id === 'input_boolean.badezimmerrollo_aussetzen')\n{\n context.cover_bazi_aussetzen = msg.payload\n}\nif (msg.data.entity_id === 'cover.bazi_shlsht_fenster')\n{\n context.cover_bazi_status = msg.data.attributes.current_position\n}\n\n//----------------------------\nif (context.cover_arzi_aussetzen === \"off\" && context.cover_arzi_status === 100)\n{\nmsg.payload =\n\n {\"service\": \"notify\", data:{\"message\":\"Arbeitszimmer Aussetzen off, status 100\"}}\n return [msg,null]\n}\n\nif (context.cover_bazi_aussetzen === \"off\" && context.cover_bazi_status === 100)\n{\nmsg.payload =\n\n {\"service\": \"notify\", data:{\"message\":\"Badezimmer Aussetzen off, status 100\"}}\n return [null,msg]\n}\n",
"outputs": 2,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 1500,
"y": 1380,
"wires": [
[
"ffb3cdb229a48952"
],
[
"ffb3cdb229a48952"
]
],
"outputLabels": [
"Sonnenstand",
""
]
},
{
"id": "82060ac7f40364b5",
"type": "inject",
"z": "6033c466a6e49c53",
"name": "",
"props": [
{
"p": "payload"
},
{
"p": "topic",
"vt": "str"
}
],
"repeat": "",
"crontab": "",
"once": false,
"onceDelay": 0.1,
"topic": "",
"payload": "",
"payloadType": "date",
"x": 880,
"y": 1380,
"wires": [
[
"38e4d6300fc6052d",
"9f7097f6a82744bf",
"b826085b6b3c72d2",
"820d6d35d25f9547"
]
]
},
{
"id": "ffb3cdb229a48952",
"type": "debug",
"z": "6033c466a6e49c53",
"name": "Function Data",
"active": true,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "payload",
"targetType": "msg",
"statusVal": "",
"statusType": "auto",
"x": 1740,
"y": 1380,
"wires": []
},
{
"id": "ddbd0338d04ff2f9",
"type": "server",
"name": "wlb-ha01.skynet.loc",
"version": 2,
"addon": false,
"rejectUnauthorizedCerts": false,
"ha_boolean": "y|yes|true|on|home|open",
"connectionDelay": true,
"cacheJson": true,
"heartbeat": false,
"heartbeatInterval": "30"
}
]
```
---
### Author:  [@zenofmud](https://discourse.nodered.org/u/zenofmud)
#### Post date: [16 July 2022 08:51 UTC](https://discourse.nodered.org/t/if-function-returns-duplicate-msg/65134/6 "2022-07-16T08:51:50Z")
Ahh, you are using Home Assistant. It would have been helpful if you had mentioned that in the begining. Which contrib home assistant node are you using? (node-red-contrib-home-????)
---
### Author:  [@pawael](https://discourse.nodered.org/u/pawael)
#### Post date: [16 July 2022 08:54 UTC](https://discourse.nodered.org/t/if-function-returns-duplicate-msg/65134/7 "2022-07-16T08:54:17Z")
Oh my bad you are right. I'm sorry!
I'm using node-red-contrib-home-assistant-websocket
---
### Author:  [@zenofmud](https://discourse.nodered.org/u/zenofmud)
#### Post date: [16 July 2022 08:55 UTC](https://discourse.nodered.org/t/if-function-returns-duplicate-msg/65134/8 "2022-07-16T08:55:51Z")
With four msgs going into your function node, each of te four wll be processed seperately. If you need to combine the msgs before processing take a look at the `join` node.
See [this article in the cookbook](https://cookbook.nodered.org/basic/join-streams) for an example of how to join messages into one object.
also put a `debug` node (set to display the complete msg object) on the output of one of the HA nodes and copy/past the results here.
There’s a great page in the docs ([Working with messages : Node-RED](https://nodered.org/docs/user-guide/messages)) that will explain how to use the debug panel to find the right path to any data item.
Pay particular attention to the part about the buttons that appear under your mouse pointer when you over hover a debug message property in the sidebar.
---
### Author:  [@pawael](https://discourse.nodered.org/u/pawael)
#### Post date: [16 July 2022 09:42 UTC](https://discourse.nodered.org/t/if-function-returns-duplicate-msg/65134/9 "2022-07-16T09:42:54Z")
YES, that's it. Its working correctly. Perfect!!!
Thank you very very much for your great help!!!
Are there any information I need to provide to help other people when they have this problem?
---
### Author:  [@zenofmud](https://discourse.nodered.org/u/zenofmud)
#### Post date: [16 July 2022 09:58 UTC](https://discourse.nodered.org/t/if-function-returns-duplicate-msg/65134/10 "2022-07-16T09:58:59Z")
Explain what you did to get it to work then mark one of the posts as the solution.
Glad you got it working.
---
### Author:  [@pawael](https://discourse.nodered.org/u/pawael)
#### Post date: [16 July 2022 10:15 UTC](https://discourse.nodered.org/t/if-function-returns-duplicate-msg/65134/11 "2022-07-16T10:15:45Z")
```auto
[
{
"id": "ca237f11c6490509",
"type": "api-current-state",
"z": "6033c466a6e49c53",
"name": "CHK: Ist Rollo AZ bereits geöffnet",
"server": "ddbd0338d04ff2f9",
"version": 3,
"outputs": 1,
"halt_if": "",
"halt_if_type": "str",
"halt_if_compare": "is",
"entity_id": "cover.arzi_shlsht_fenster",
"state_type": "str",
"blockInputOverrides": false,
"outputProperties": [
{
"property": "payload",
"propertyType": "msg",
"value": "",
"valueType": "entityState"
},
{
"property": "data",
"propertyType": "msg",
"value": "",
"valueType": "entity"
},
{
"property": "topic",
"propertyType": "msg",
"value": "arzi2",
"valueType": "str"
}
],
"for": 0,
"forType": "num",
"forUnits": "minutes",
"x": 1120,
"y": 1120,
"wires": [
[
"a189bda238d4ed71"
]
]
},
{
"id": "c591e66e75895653",
"type": "join",
"z": "6033c466a6e49c53",
"name": "",
"mode": "custom",
"build": "object",
"property": "payload",
"propertyType": "msg",
"key": "topic",
"joiner": "\\n",
"joinerType": "str",
"accumulate": false,
"timeout": "",
"count": "2",
"reduceRight": false,
"reduceExp": "",
"reduceInit": "",
"reduceInitType": "",
"reduceFixup": "",
"x": 1590,
"y": 1000,
"wires": [
[
"6088e2386c5a3173"
]
]
},
{
"id": "b901675fdea50c48",
"type": "api-current-state",
"z": "6033c466a6e49c53",
"name": "CHK: Ist Rollo AZ aussetzen an?",
"server": "ddbd0338d04ff2f9",
"version": 3,
"outputs": 1,
"halt_if": "",
"halt_if_type": "str",
"halt_if_compare": "is",
"entity_id": "input_boolean.arbeitszimmerrollo_aussetzen",
"state_type": "str",
"blockInputOverrides": false,
"outputProperties": [
{
"property": "payload",
"propertyType": "msg",
"value": "",
"valueType": "entityState"
},
{
"property": "data",
"propertyType": "msg",
"value": "",
"valueType": "entity"
},
{
"property": "topic",
"propertyType": "msg",
"value": "arzi1",
"valueType": "str"
}
],
"for": 0,
"forType": "num",
"forUnits": "minutes",
"x": 1120,
"y": 1040,
"wires": [
[
"c591e66e75895653"
]
]
},
{
"id": "a189bda238d4ed71",
"type": "change",
"z": "6033c466a6e49c53",
"name": "",
"rules": [
{
"t": "set",
"p": "payload",
"pt": "msg",
"to": "data.attributes.current_position",
"tot": "msg"
}
],
"action": "",
"property": "",
"from": "",
"to": "",
"reg": false,
"x": 1390,
"y": 1100,
"wires": [
[
"c591e66e75895653"
]
]
},
{
"id": "1248ffa98b229580",
"type": "inject",
"z": "6033c466a6e49c53",
"name": "",
"props": [
{
"p": "payload"
},
{
"p": "topic",
"vt": "str"
}
],
"repeat": "",
"crontab": "",
"once": false,
"onceDelay": 0.1,
"topic": "",
"payload": "",
"payloadType": "date",
"x": 800,
"y": 1100,
"wires": [
[
"b901675fdea50c48",
"ca237f11c6490509",
"3e0b240261377415",
"a692a371b4ced6de"
]
]
},
{
"id": "0dd0fc2185721fe0",
"type": "debug",
"z": "6033c466a6e49c53",
"name": "debug 1",
"active": true,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "false",
"statusVal": "",
"statusType": "auto",
"x": 1920,
"y": 1080,
"wires": []
},
{
"id": "6088e2386c5a3173",
"type": "function",
"z": "6033c466a6e49c53",
"name": "Rollosteuerung",
"func": "\n//----------------------------\nif (msg.payload.arzi1 === \"off\" && msg.payload.arzi2 === 100)\n{\nmsg.payload =\n\n {\"service\": \"notify\", data:{\"message\":\"Arbeitszimmer Aussetzen off, status 100\"}}\n return [msg,null]\n}\n\nif (msg.payload.bazi1 === \"off\" && msg.payload.bazi2 === 100)\n{\nmsg.payload =\n\n {\"service\": \"notify\", data:{\"message\":\"Badezimmer Aussetzen off, status 100\"}}\n return [msg,null]\n}\n\n",
"outputs": 2,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 1720,
"y": 1100,
"wires": [
[
"0dd0fc2185721fe0"
],
[]
],
"outputLabels": [
"Sonnenstand",
""
]
},
{
"id": "3e0b240261377415",
"type": "api-current-state",
"z": "6033c466a6e49c53",
"name": "CHK: Ist Rollo BZ aussetzen an?",
"server": "ddbd0338d04ff2f9",
"version": 3,
"outputs": 1,
"halt_if": "",
"halt_if_type": "str",
"halt_if_compare": "is",
"entity_id": "input_boolean.badezimmerrollo_aussetzen",
"state_type": "str",
"blockInputOverrides": false,
"outputProperties": [
{
"property": "payload",
"propertyType": "msg",
"value": "",
"valueType": "entityState"
},
{
"property": "data",
"propertyType": "msg",
"value": "",
"valueType": "entity"
},
{
"property": "topic",
"propertyType": "msg",
"value": "bazi1",
"valueType": "str"
}
],
"for": 0,
"forType": "num",
"forUnits": "minutes",
"x": 1120,
"y": 1200,
"wires": [
[
"4e712983e2706850"
]
]
},
{
"id": "a692a371b4ced6de",
"type": "api-current-state",
"z": "6033c466a6e49c53",
"name": "CHK: Ist Rollo BZ bereits geöffnet",
"server": "ddbd0338d04ff2f9",
"version": 3,
"outputs": 1,
"halt_if": "",
"halt_if_type": "str",
"halt_if_compare": "is",
"entity_id": "cover.bazi_shlsht_fenster",
"state_type": "str",
"blockInputOverrides": false,
"outputProperties": [
{
"property": "payload",
"propertyType": "msg",
"value": "",
"valueType": "entityState"
},
{
"property": "data",
"propertyType": "msg",
"value": "",
"valueType": "entity"
},
{
"property": "topic",
"propertyType": "msg",
"value": "bazi2",
"valueType": "str"
}
],
"for": 0,
"forType": "num",
"forUnits": "minutes",
"x": 1120,
"y": 1260,
"wires": [
[
"d7b90bcdf50aa039"
]
]
},
{
"id": "d7b90bcdf50aa039",
"type": "change",
"z": "6033c466a6e49c53",
"name": "",
"rules": [
{
"t": "set",
"p": "payload",
"pt": "msg",
"to": "data.attributes.current_position",
"tot": "msg"
}
],
"action": "",
"property": "",
"from": "",
"to": "",
"reg": false,
"x": 1390,
"y": 1300,
"wires": [
[
"4e712983e2706850"
]
]
},
{
"id": "4e712983e2706850",
"type": "join",
"z": "6033c466a6e49c53",
"name": "",
"mode": "custom",
"build": "object",
"property": "payload",
"propertyType": "msg",
"key": "topic",
"joiner": "\\n",
"joinerType": "str",
"accumulate": false,
"timeout": "",
"count": "2",
"reduceRight": false,
"reduceExp": "",
"reduceInit": "",
"reduceInitType": "",
"reduceFixup": "",
"x": 1550,
"y": 1220,
"wires": [
[
"6088e2386c5a3173"
]
]
},
{
"id": "ddbd0338d04ff2f9",
"type": "server",
"name": "wlb-ha01.skynet.loc",
"version": 2,
"addon": false,
"rejectUnauthorizedCerts": false,
"ha_boolean": "y|yes|true|on|home|open",
"connectionDelay": true,
"cacheJson": true,
"heartbeat": false,
"heartbeatInterval": "30"
}
]
```
First I set topics in the current\_state nodes because in manual mode the join node requires topics.
After that I changed my payload from "open" to the current percentage of my shutters (cover.arzi\_shlsht\_fenster and cover.bazi\_shlsht\_fenster). Then I sent the msgs from each room (Abeitszimmer and Badezimmer) to their own join node. The join node sends the combined messages to the function node and here I compare my values. Now the output is only one message per room.
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [30 July 2022 10:16 UTC](https://discourse.nodered.org/t/if-function-returns-duplicate-msg/65134/12 "2022-07-30T10:16:05Z")
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