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DataPublisherService not connected [message #1783663]

Thu, 15 March 2018 06:21

Eclipse User

Hi, I am trying to run an application based on the Heater example of kura, but I couldn't receive any data on the client side.

On the log I found that the "DataPublisherService not connected", and I used this configuration:
mqtt://broker.mqtt-dashboard.com:1883/

Can anyone help me please

06:15:39,837 [pool-15-thread-1] INFO Heater:295 - Published to sacem12 message: org.eclipse.kura.message.KuraPayload@1d4f432
06:15:41,839 [pool-15-thread-1] INFO DataServiceImpl:531 - Storing message on topic :#account-name/#client-id/heater/sacem12, priority: 5
06:15:41,845 [pool-15-thread-1] INFO DataServiceImpl:534 - Stored message on topic :#account-name/#client-id/heater/sacem12, priority: 5
06:15:41,851 [DataServiceImpl:Submit] INFO DataServiceImpl:821 - DataPublisherService not connected
06:15:41,851 [pool-15-thread-1] INFO Heater:295 - Published to sacem12 message: org.eclipse.kura.message.KuraPayload@17b3a90
06:15:43,853 [pool-15-thread-1] INFO DataServiceImpl:531 - Storing message on topic :#account-name/#client-id/heater/sacem12, priority: 5
06:15:43,862 [pool-15-thread-1] INFO DataServiceImpl:534 - Stored message on topic :#account-name/#client-id/heater/sacem12, priority: 5
06:15:43,863 [DataServiceImpl:Submit] INFO DataServiceImpl:821 - DataPublisherService not connected
06:15:43,864 [pool-15-thread-1] INFO Heater:295 - Published to sacem12 message: org.eclipse.kura.message.KuraPayload@778438

Re: DataPublisherService not connected [message #1783664 is a reply to message #1783663]

Thu, 15 March 2018 06:25

Eclipse User

Hi,
that message means that the Kura gateway is currently not connected to the desired mqtt endpoint so, no message can be published.
I would ask you to review the connection parameters and verify if they are correct. Furthermore, please verify that the gateway can connect to the mqtt endpoint.

Best regards,
Matteo

Re: DataPublisherService not connected [message #1784189 is a reply to message #1783664]

Fri, 23 March 2018 06:27

Eclipse User

Dear Matteo,

Thank you for your support and help.
I solved the problem and it works now.
However I have another question please.

I build a bundle to communication with a Modbus device, where Kura play the role of modbus client and it work fine.
I want this bundle to be used by another bundle (I want the new package to start, stop, set params of the modbus package ).
Any suggestions or examples manifesting this approach ?

Kindest regards

Re: DataPublisherService not connected [message #1784193 is a reply to message #1784189]

Fri, 23 March 2018 07:24

Eclipse User

It depends on what you want to achieve.
If you simply want to use the first bundle, you can have it exporting an api as a service and use osgi in order to find the bundle and use it as a service provider.
I believe that this is the usual behaviour in OSGi and most of the framework is built in this way.
You can have a look at the way the can example (https://github.com/eclipse/kura/tree/develop/kura/examples/org.eclipse.kura.example.can) uses the can protocol provider bundle (https://github.com/eclipse/kura/tree/develop/kura/org.eclipse.kura.protocol.can).

Best regards,
Matteo

Re: DataPublisherService not connected [message #1784294 is a reply to message #1783664]

Mon, 26 March 2018 06:51

Eclipse User

Thank you dear Matteo,

I tried an example with your advice, however I have always this error when I try to import the bundle :
org.osgi.framework.BundleException: Could not resolve module: com.sacem.iiotgatway.main [76]
Unresolved requirement: Import-Package: com.sacem.iiotgateway.modbus

even it's declared in MANIFEST.MF file:

Import-Package: com.sacem.iiotgateway.modbus,
org.eclipse.kura.configuration;version="1.1.2",
org.osgi.service.component;version="1.2.2",
org.slf4j;version="1.7.21

Re: DataPublisherService not connected [message #1784306 is a reply to message #1784294]

Mon, 26 March 2018 09:23

Eclipse User

Hi, it seems that you are not able to import that package.

Is that exported?
Have you had a look at the can examples. I believe you could try to copy from there. Or having a look at the official documentation where the examples provided can give you an hint on how to proceed.

Best regards,
Matteo

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