# How to strip out unwanted MQTT inputs(?)
**URL:** https://discourse.nodered.org/t/how-to-strip-out-unwanted-mqtt-inputs/39805
**Category:** General
**Created:** [26 January 2021 17:31 UTC](https://discourse.nodered.org/t/how-to-strip-out-unwanted-mqtt-inputs/39805 "2021-01-26T17:31:44Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@haskle](https://discourse.nodered.org/u/haskle)
#### Post date: [26 January 2021 17:31 UTC](https://discourse.nodered.org/t/how-to-strip-out-unwanted-mqtt-inputs/39805/1 "2021-01-26T17:31:44Z")
Newbie(ish) question: I have managed to set up my Node\_RED RPi to receive MQTT messages with the topic `home/rtl_433` from an MQTT broker installed on a different RPi.
But there are a load of messages that I am not interested in, and I don't know how to "filter them out" or delete / remove them.
EG: I do _not_ want these messages ...
```auto
home/rtl_433 : msg.payload : Object
object
time: "2021-01-26 17:29:25"
brand: "OS"
model: "Oregon-v1"
id: 0
channel: 4
battery_ok: 0
temperature_C: -157.7
mic: "CHECKSUM"
```
... but I do want these ...
```auto
home/rtl_433 : msg.payload : Object
object
time: "2021-01-26 17:29:16"
model: "Oil-SonicSmart"
id: 136628653
flags: 128
maybetemp: 24
temperature_C: 8.333
binding_countdown: 0
depth_cm: 96
```
How might I achieve this?
Many thanks!
---
### Author:  [@E1cid](https://discourse.nodered.org/u/E1cid)
#### Post date: [26 January 2021 17:43 UTC](https://discourse.nodered.org/t/how-to-strip-out-unwanted-mqtt-inputs/39805/2 "2021-01-26T17:43:44Z")
if you had given your mqtt topics another value eg
```auto
home/device1/rtl_433
```
You could target the topic to the device. To get all devices you could then use wildcard e.g. `home/+/rtl_433`
As you have not, you can use a switch node to only allow message to pass on certain message property value, etc.
---
### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [26 January 2021 17:44 UTC](https://discourse.nodered.org/t/how-to-strip-out-unwanted-mqtt-inputs/39805/3 "2021-01-26T17:44:23Z")
You can use a Switch node to only pass messages where msg.payload.model is Oil-SonicSmart.
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [27 March 2021 17:44 UTC](https://discourse.nodered.org/t/how-to-strip-out-unwanted-mqtt-inputs/39805/4 "2021-03-27T17:44:58Z")
This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.