MQTT v1 Binding - How to install on OH2.5

Hi all,

I’m an OH user for many years since v1.

With the release of OH3 I want to do a migration path for my home setup.
For this I want to install a backup server in order to have a working system in a few minutes if i made some error in the migration.
So i have installed a linux VM with OH2.5 and want to reply my working configuration from the production system.
But i got stuck in the MQTTv1 Biding install. For some reason I cannot install it.

I have enabled the legacy bindings in paper UI
I have installed the OH addons
And when search on PaperUI bindings it does not appear. Only MQTT v2.

If I add mqq1 in addons.cfg the log shows the following:
2021-06-12 08:33:39.079 [ERROR] [core.karaf.internal.FeatureInstaller] - Failed installing ‘openhab-binding-mqqt1’

Also for some reason I cannot find the jar file online.

Can you please provide any clue please :smiley:



I downloaded the legacy kar file to


After this the binding appeared in the Paper UI

Thanks to all.

May I ask why you prefer to install v1 over v2 ?
Using v2 would be the first step of migration to OH3 as v1 is not available for OH3.

The error message has a strange spelling

is this copied from the original error message or did you type it manually ?
Is there anything else behind this error message like a hint that mvn access does not work ?
If yes this should help: openHAB 2.5.x and the sunset of Bintray


you’ll need legacy kar

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I completely agree with you. But i need time to move to OH3. Need to understand it better. OH2 is stable and now I have to many automations in the system. Cannot have the risk to be without system for more than a day.

And yes, i’ve copied the error message from log file. Although i had made many changes in the configuration so maybe it is because of that.

Thaks for your comments

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