MQTT broker

[sabiha patan]

is it possible to process at broker by making changes in configuration file?

[ನಾಗೇಶ್ ಸುಬ್ರಹ್ಮಣ್ಯ (Nagesh S)]

Can you please describe 'process at broker' ?

Pardon brevity, typos and grammar mistakes. Sent from phone.

On 21 Oct 2016 10:39, "sabiha patan" <sabiha...@gmail.com> wrote:

is it possible to process at broker by making changes in configuration file?

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[sweety]

Let's say a publisher is publishing LDR values to broker and that broker sends LDR values to a subscriber. It's like broker sends whatever it receives. My subscriber does not want all LDR values it just wants LDR value above some threshold. For that, broker should do processing and sends values above the threshold. Is it possible? 

[ನಾಗೇಶ್ ಸುಬ್ರಹ್ಮಣ್ಯ (Nagesh S)]

A broker - in general sense of the word - simply establishes communication between two or more parties. So embedding logic at the broker, to compare values against a threshold is not right. For example, think of scalability of the logic.

A better approach would be to have a subscribing application to process the messages and publish onto a different topic to which your end application would subscribe. Examples of subscribing applications would be IBM Node-red, IBM IIB, etc.

Regards,
Nagesh Subrahmanyam

Pardon brevity, typos and grammar mistakes. Sent from phone.

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[Paul Fremantle]

Nagesh

I agree completely with the model of republishing the subset of filtered data onto a new topic. 

However, there are some brokers that offer plugins that do the function you need. Alternatively, it is possible to embed a broker into and existing system 

to do that kind of stuff. I have used Matteo Collina's aedes to do that kind of thing and it works quite well.

Paul

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Paul Fremantle

Part-time PhD student - School of Computing

email: paul.fr...@port.ac.uk, pa...@fremantle.org

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[ನಾಗೇಶ್ ಸುಬ್ರಹ್ಮಣ್ಯ (Nagesh S)]

Hi Paul,
+1 on the plugin architecture.

Regards,
Nagesh Subrahmanyam

Pardon brevity, typos and grammar mistakes. Sent from phone.

[sweety]

What is plugin architecture and how it could be implemented at mosquitto broker?

On Friday, October 21, 2016 at 10:39:10 AM UTC+5:30, sweety wrote: