[SOLVED] [MQTTv2] MqttBroker connection configuration faulty: host : You need to provide a hostname/IP!

Hello, i have problem running mqtt on OpenHab2 cannot connect to mqtt broker “You need to provide a hostname/IP!”

config /services/mqtt.cfg


var/lib/openhab2/config/org/openhab/mqtt.config is empty

the broker and the OH2 are on the same machine.


2018-12-04 22:22:58.653 [DEBUG] [org.openhab.io.transport.mqtt       ] - BundleEvent [unknown:512] - org.openhab.io.transport.mqtt
2018-12-04 22:23:21.931 [DEBUG] [org.openhab.io.transport.mqtt       ] - BundleEvent STARTING - org.openhab.io.transport.mqtt
2018-12-04 22:23:21.937 [DEBUG] [org.openhab.io.transport.mqtt       ] - BundleEvent STARTED - org.openhab.io.transport.mqtt
2018-12-04 22:23:21.964 [DEBUG] [penhab.io.transport.mqtt.MqttService] - Starting MQTT Service...
2018-12-04 22:23:21.970 [DEBUG] [org.openhab.io.transport.mqtt       ] - ServiceEvent REGISTERED - {org.openhab.io.transport.mqtt.MqttService, org.osgi.service.cm.ManagedService}={service.id=320, service.bundleid=269, service.scope=bundle, service.pid=org.openhab.mqtt, component.name=MQTT Connection Service, component.id=15} - org.openhab.io.transport.mqtt
2018-12-04 22:23:21.972 [TRACE] [penhab.io.transport.mqtt.MqttService] - Processing property 'pi6broker.clientId' = OpenHAB2
2018-12-04 22:23:21.998 [TRACE] [t.mqtt.internal.MqttBrokerConnection] - clientId property changed. client will be shut down.
2018-12-04 22:23:22.000 [DEBUG] [t.mqtt.internal.MqttBrokerConnection] - Closing connection to broker 'pi6broker'
2018-12-04 22:23:22.002 [TRACE] [penhab.io.transport.mqtt.MqttService] - Processing property 'pi6broker.url' = tcp://
2018-12-04 22:23:22.004 [TRACE] [t.mqtt.internal.MqttBrokerConnection] - url property changed. client will be shut down.
2018-12-04 22:23:22.006 [DEBUG] [t.mqtt.internal.MqttBrokerConnection] - Closing connection to broker 'pi6broker'
2018-12-04 22:23:22.008 [INFO ] [penhab.io.transport.mqtt.MqttService] - MQTT Service initialization completed.
2018-12-04 22:23:22.010 [INFO ] [t.mqtt.internal.MqttBrokerConnection] - Starting MQTT broker connection 'pi6broker'
2018-12-04 22:23:22.019 [DEBUG] [t.mqtt.internal.MqttBrokerConnection] - Creating new client for 'tcp://' using id 'OpenHAB2' and file store '/var/lib/openhab2/tmp/pi6broker'
2018-12-04 22:23:24.214 [WARN ] [.MqttBrokerConnectionServiceInstance] - MqttBroker connection configuration faulty: host : You need to provide a hostname/IP!

did you try without a number in the alias? (this maybe a bug)


that’s not good. it should be populated with the info coming from $OPENHAB_CONF/services/mqtt.cfg
delete $OPENHAB_USERDATA/config/org/openhab/mqtt.config and let OH2 recreate it
Did you erase the info from this file manually?

Do you have the MQTT Action installed also?

oops… it seems that you are using the new MQTTv2 Binding?

What exactly did you install in PaperUI? Which OH2 version are you running?

Yes i use the new V2 binding, i use openHAB 2.4.0 Build #1447
PaperUI i have install mqtt action and binding. And some other bindings witch also not work. The in OH2 item files, sitemaps files, … everything is different. And this Thinks i read the documentation about them but i cannot understand their purpose. is it needed to communicate with the broker.

Then you should not use mqtt.cfg anymore. This is for MQTTv1 (same with the MQTT Action Addon)

For MQTTv2 Read:

  1. https://github.com/eclipse/smarthome/blob/master/extensions/binding/org.eclipse.smarthome.binding.mqtt/README.md
  2. MQTT binding version 2.4

Also: read: How to ask a good question (you should have mentioned your OH2 and binding version in the first post :stuck_out_tongue:)

Finally is fixed.

I delete the new binding 2.4 and install the old one and everything is ok.

The documentation is little bit confusing there write version “latest” but is for MQTTv1

Take a look at the URL: https://www.openhab.org/addons/bindings/mqtt1/ (MQTTv1)
The docs for MQTTv2 have not been published yet on the openhab website
The latest refers to the openHAB Release # (latest = 2.4.0)

Is this solved? :slight_smile:
With openHAB 2.4 there is no need to use mqttv1, except if you like text files and pain.

Cheers, David

seems so :slight_smile:
user fell back to MQTTv1

kinky !

Hello. I have the same problem, but I don’t know how to install MQTTv1.
The only option that appears in Paper UI is:
### Embedded MQTT Broker
misc-mqttbroker - 2.3.0

Even with “Include Legacy 1.x Bindings” activated.
My OH2 version: 2.3.0 Release Build

Do you know how to install MQTTv1?

you are looking in the Misc tab of the addons
check the Bindings tab

I’m using:
250 x Active x 80 x 0.10.0.oh240 x Eclipse SmartHome MQTT Binding
251 x Active x 80 x 0.10.0.oh240 x Eclipse SmartHome MQTT Thing Binding
252 x Active x 80 x 0.10.0.oh240 x Eclipse SmartHome MQTT Transport Bundle
everything works fine.
I delete also:
But anyway I got the log entry:

2018-12-21 13:45:35.721 [WARN ] [.MqttBrokerConnectionServiceInstance] - MqttBroker connection configuration faulty: host : You need to provide a hostname/IP!

As I mentioned everything works fine but I will not see this entry :wink:

Have you cleared the cache?

Yes just now but it did not solve it.

How did you configure MQTT, by PaperUI or files?

Please post all your settings and all log lines relating to mqtt after a restart.

This is not related to MQTT Things. This is related to what is referred to as System brokers in the MQTT blog post. There is a UI for this in Paper UI. Look under “Config -> Services -> MQTT Brokers” or so and delete all broker instances over there.

Hey David - 100 Points :slight_smile:
This solves the problem. Thank You.
BTW: Under “Config -> Services -> MQTT Brokers” I had no instances.
I do the this in Karaf console:

  229  config:list | grep -i mqtt
  230  config:delete org.eclipse.smarthome.mqttbroker