# Control From MQTT
**URL:** https://discourse.nodered.org/t/control-from-mqtt/99617
**Category:** General
**Created:** [7 November 2025 16:32 UTC](https://discourse.nodered.org/t/control-from-mqtt/99617 "2025-11-07T16:32:18Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@MarkH](https://discourse.nodered.org/u/MarkH)
#### Post date: [7 November 2025 16:32 UTC](https://discourse.nodered.org/t/control-from-mqtt/99617/1 "2025-11-07T16:32:18Z")
Afternoon All!
I'm trying to control a Air zone AC controller from my BMS system (JACE 8000 Niagara 4).
This is my setup:
Air Zone Controller connected to a PI5 (Running Home Assist)
Zigbee (Sonoff dongle).
HA is running Node Red.
RUT955 Modem (Acting as my MQTT Broker)
Niagara running control logic and graphics.
I currently have MQTT data being sent and received to and from the JACE8000 & PI5 (node red).
HA gives me a option via the "Trigger: state" to take data from the device and send it via MQTT to my BMS system. For example i can see if the AC unit is on or off.
Below is the "Trigger: state" block taking information from the switch and sending it to the JACE.
Below is the status of the AC switch (RUNNING/OFF) being sent via MQTT to my jace.
What I'm struggling with is to reverse that, so my BMS system will dictate weather the unit should be on or off.
How do i send the true/false being received from the JACE to the device to turn the unit on or off?
Hope there is enough information here for any help!
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### Author:  [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [7 November 2025 21:16 UTC](https://discourse.nodered.org/t/control-from-mqtt/99617/2 "2025-11-07T21:16:37Z")
Hi and welcome to the forum.
(Just to let you know - though you may have been told.)
You are limited to how many posts you can do for the first _day_.
**More importatntly**?
I am NOT a `HA` person.
> [@MarkH](#):
>
> HA gives me a option via the "Trigger: state" to take data from the device and send it via MQTT to my BMS system. For example i can see if the AC unit is on or off.
Doesn't that solve your question?
Or are you wanting a reply from the actual unit _CONFIRMING_ it has received the command and turned on?
You are _Publishing_ the message to `office 1/AC/Switch`
Put an `MQTT IN` node to that topic and it will receive/_echo_ what is being sent to the AC unit.
OR....
Just wire the `TRUE/FALSE State Convert` node's output to where you want to _See_ the state.
🤷
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### Author:  [@greengolfer](https://discourse.nodered.org/u/greengolfer)
#### Post date: [8 November 2025 07:27 UTC](https://discourse.nodered.org/t/control-from-mqtt/99617/3 "2025-11-08T07:27:18Z")
Not sure if I understand the functions of the different components in your design, so I might be wrong below...
1. Use a MQTT in node to listen what is coming out of the JACE. You'd have to configure the topic accordingly, I guess the documentation will tell you that. Out of that MQTT in node, you should get an on/off status.
2. You plug a switch node on the output. Testing on/off will give you two outputs.
3. Then, on each output, add an `action` node (from the same palette of the trigger). In there select the switch you want to act on, and call turn\_on or turn\_off depending on the action you want to do.
On the flow that you shared, I don't know exactly what the function node does... I suspect it can/should be replaced by a `change` node.
In node red, usually, the `function` node is the sledgehammer you take out when nothing else is sufficient.
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### Author:  [@MarkH](https://discourse.nodered.org/u/MarkH)
#### Post date: [10 November 2025 15:55 UTC](https://discourse.nodered.org/t/control-from-mqtt/99617/4 "2025-11-10T15:55:37Z")
To simplify sorry,
JACE makes a true/false \> This is transmitted via MQTT to my PI5 (HA) \> the status true/false is picked up and outputs to a device connected to the Zigbee network.
On the action block it seems i can only do/select certain commands/actions like turn off and each time i send a true/false it only triggers the off command.
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### Author:  [@greengolfer](https://discourse.nodered.org/u/greengolfer)
#### Post date: [11 November 2025 10:03 UTC](https://discourse.nodered.org/t/control-from-mqtt/99617/5 "2025-11-11T10:03:52Z")
If you are using the `action` node, then, you'll see:
So, you can turn on/off a switch like that.
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [9 February 2026 10:04 UTC](https://discourse.nodered.org/t/control-from-mqtt/99617/6 "2026-02-09T10:04:15Z")
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