Cacti and Openhab integration using REST API and curl
This tutorial shows how to fetch data from Openhab REST API and feed it as input into a Cacti graph. The data is fetched with curl. Openhab monitors temperatures with two Proove wireless temperature sensors via Tellstick duo.
The reason for doing this is that in Openhab 1.X the graphs are not as good as in Cacti and it also allows to share graphs to other sites see the example here.
Please excuse the example names in screenshots as they are in Finnish.
Raspberry Pi running Raspbian
Openhab installation with a few items as data sources
Create Cacti Input Method
In Cacti console, go to Data Input Methods and click on Add
Enter a name and choose Input type to Script/Command
in Input string add this command replacing the IP address and items name with your own
In the Output fields click on Add
Then add a descriptive name for the Field [output] and a friendly name
Check the box "update RRD file"
The end result should look something like this
Create a Cacti datasource
In Cacti go to Data templates and click on Add
Give it a descriptive name and choose the Data input method you just created
In the Output filed choose the output field you created
Create a graph template
In Cacti go to Graph templates and click on Add
Create Items where the data source is the Data source you created. In this graph I'm using two data sources and showing them in the same graph.
Create the Device in Cacti
Finally to tie everything together create device with this Graph template