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Difference in Mqtt Publish/Subscribe via CloudService and DataService in Kura [message #1732766]

Thu, 19 May 2016 23:20

Praful CJ

Messages: 8
Registered: May 2016

Junior Member

Hi,

I was able to publish and subscribe in Mqtt using CloudService and DataService. Could you please help me in understanding advantage/disadvantage by using these 2 implementations in Kura.
I would also like to know purpose of using accountName ,clientID in MQTT for cloudservice implementation.

Regards,
Praful

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Re: Difference in Mqtt Publish/Subscribe via CloudService and DataService in Kura [message #1732981 is a reply to message #1732766]

Mon, 23 May 2016 14:30

David Woodard

Messages: 420
Registered: July 2014

Senior Member

Hello,

The main advantages of using the CloudService are:

* The messages are serialized using Google Protobufs and GZIP to efficiently manage the size of the payloads
* Applications are logically separated by application IDs so multiple applications can communicate without risk of topic namespace collisions

Main reasons for not using the CloudService:

* You need complete control of the topic names (i.e. not following the CloudService model of <account_name>/<client_id>/<app_id>)
* You do not want to use Google Protobufs

For the CloudService, the accountName is used to provide a unique MQTT topic name space to messages. For both the CloudService and DataService, the clientID is the MQTT client ID that uniquely identifies the Kura MQTT client with the broker.

Thanks,
--Dave

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Re: Difference in Mqtt Publish/Subscribe via CloudService and DataService in Kura [message #1733225 is a reply to message #1732981]

Wed, 25 May 2016 14:28

Praful CJ

Messages: 8
Registered: May 2016

Junior Member

Hi Dave,

Thanks for the information , it was the precise info i was looking for

Regards,
Praful

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Re: Difference in Mqtt Publish/Subscribe via CloudService and DataService in Kura [message #1763842 is a reply to message #1733225]

Mon, 22 May 2017 07:14

iqbal elfaita

Messages: 26
Registered: March 2017

Junior Member

Hello Praful,

I am new to try for eclipse kura, I now trying to implement the dataservice for publishing data but not succeed yet, can you help me please to tell me the recommended tutorial of building the dataservice implementation on kura ?

and you said that you successfully implemented the cloudservice of kura, how do you recommend to implement google protobuf decoder for subscribe via web client ?

Thanks,
Iqbal

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Re: Difference in Mqtt Publish/Subscribe via CloudService and DataService in Kura [message #1763995 is a reply to message #1763842]

Tue, 23 May 2017 18:10

David Woodard

Messages: 420
Registered: July 2014

Senior Member

Hello,

What problems are you having with the DataService?

For decoding protobuf messages in Javascript, I would recommend Protobuf.JS version 6.6.3.

Thanks,
--Dave

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