# Function tried to send a message of type boolean
**URL:** https://discourse.nodered.org/t/function-tried-to-send-a-message-of-type-boolean/56340
**Category:** General
**Created:** [9 January 2022 10:57 UTC](https://discourse.nodered.org/t/function-tried-to-send-a-message-of-type-boolean/56340 "2022-01-09T10:57:29Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@hermiot](https://discourse.nodered.org/u/hermiot)
#### Post date: [9 January 2022 10:57 UTC](https://discourse.nodered.org/t/function-tried-to-send-a-message-of-type-boolean/56340/1 "2022-01-09T10:57:29Z")
Hi,
I'm trying to build up a logic to control my ventilator.
Only one of the four switches can be active at one time. So I'm trying to send the message to activate/deactivate the relays with a function.
```auto
var L1_on = msg.payload.On === true;
var L1_off = {payload:"stufe1"};
var L2_on = {payload:"stufe2"};
var L2_off = {payload:"stufe2"};
var L3_on = {payload:"stufe3"};
var L3_off = {payload:"stufe3"};
var L4_on = {payload:"stufe4"};
var L4_off = {payload:"stufe4"};
var topic=msg.topic;
if (topic=="stufe1"){
if(msg.payload.On == true){
return L1_on;
}
} else if (topic=="stufe2"){
if(msg.payload.On == true){
return L2_on;
}
} else if (topic=="stufe3"){
if(msg.payload.On == true){
return L3_on;
}
} else if (topic=="stufe4"){
if(msg.payload.On == true){
return L4_on;
}
}
```
It would help a lot, if the vars contain the corresponding messages so I can send them as bulk.
I.e.
`return [L1_on, L2_off, L3_off, L4_off]`
if button 1 is pressed or
`return [L1_off, L2_on, L3_off, L4_off]`
if button 2 is pressed and so on.
How can I assign the variables a bool message as objects?
I attached a picture of the message I want to store in var L1\_on.
I tried `var L1_on = msg.payload.On === true;` but this ends up in an error (Function tried to send a message of type boolean).
Thank you very much!
---
### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [9 January 2022 10:59 UTC](https://discourse.nodered.org/t/function-tried-to-send-a-message-of-type-boolean/56340/2 "2022-01-09T10:59:26Z")
> [@hermiot](#):
>
> ```auto
> var L1_on = msg.payload.On === true;
>
> ```
This will make a Boolean value.
Maybe you meant
```auto
var L1_on = {payload: msg.payload.On === true}
```
---
### Author:  [@hermiot](https://discourse.nodered.org/u/hermiot)
#### Post date: [9 January 2022 11:02 UTC](https://discourse.nodered.org/t/function-tried-to-send-a-message-of-type-boolean/56340/3 "2022-01-09T11:02:47Z")
> [@Steve-Mcl](#):
>
> `{payload: msg.payload.On === true}`
This only returns
msg.payload : boolean
true
Is there a way to send the message like defined in the picture without using the change node?
---
### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [9 January 2022 11:09 UTC](https://discourse.nodered.org/t/function-tried-to-send-a-message-of-type-boolean/56340/4 "2022-01-09T11:09:37Z")
> [@hermiot](#):
>
> Is there a way to send the message like defined in the picture without using the change node
Of course
```auto
var L1_on = {
payload: {
On: msg.payload.On === true
}
}
```
Though I must point out it is good practice to keep the original msg object (just update its payload) as there may be properties in it that are required down stream.
---
### Author:  [@hermiot](https://discourse.nodered.org/u/hermiot)
#### Post date: [9 January 2022 11:24 UTC](https://discourse.nodered.org/t/function-tried-to-send-a-message-of-type-boolean/56340/5 "2022-01-09T11:24:59Z")
> [@Steve-Mcl](#):
>
> ```auto
> var L1_on = {
> payload: {
> On: msg.payload.On === true
> }
> }
>
> ```
\o/ Thank you! \o/
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [23 January 2022 11:25 UTC](https://discourse.nodered.org/t/function-tried-to-send-a-message-of-type-boolean/56340/6 "2022-01-23T11:25:49Z")
This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.