Too many mqtt messages going to openhab

Emoncms
1

Hi guys,

How do you slow down the mqtt messages to openhab?

thanks

Matt

2

What messages are you sending? If it is power data, then they will be sent every time a reading comes in.

3

Hey fella,
Its just my power1 input. Openhab is reading it every second or every change, I thought that maybe I could slow down how many times it’s sent/read?

4

So an MQTT message will be sent every time the input is processed - i.e. the rate you set initially, usually 10s. The MQTT broker will then advertise to those clients subscribed to that topic, that there is a new value.

If you subscribe from another client, you will be able to see how often a new value is posted. the only way of reducing that is to reduce the rate in the input process.

You need to delete the feed and start again I believe to do that.

5

That makes sense. I was looking at Mqtt to see if I needed to add something to it to slow it’s messages down.

Cheers

6

On the emonPi the default update rate is 5s to MQTT. OpenHAB can handle this just fine. If you do need to slow it down you could use a rate limiter in NodeRED to re-publish the value to a new topic then subscribe to this topic in openhab.

7

Thanks Glyn.