RSMB - MQTT-SN Forwarder support

[Ryan Benoit]

Hello,

I just had a general question about RSMB and it's MQTT-SN protocol support for forwarder encapsulation (i.e. so I could forward back and forth from a non-UDP source/destination). I didn't see any details from the source code to figure out if it was implemented so I thought I'd ask the group here to see if it anyone knew if that part of the specification was implemented? 

Thanks for the help.

Ryan

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[Ian Craggs]

Hi Ryan,

RSMB does not support any encapsulation of MQTT-SN packets as it stands.  It should be reasonably straightforward to add that functionality in though -- up to now we've got away without it.

Ian

[Michal Foksa]

Hi Ryan,

I have started working on Forwarder Encapsulation few day ago. It will be available here: https://github.com/MichalFoksa/rsmb. It is original RSMB repo + few minor features and bug fixes. You might find it helpful.

Cheers,
Michal

[Ian Craggs]

Hi Michal,

would you consider contributing your RSMB updates back to Eclipse?

Ian

[Michal Foksa]

Hi Ian,

Sure, I will be happy to contribute it back. I think we have to talk about how to do it properly, and what to contribute. I have implemented few things already.

Michal

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[Amanda Mattiuz]

Hi, Michal,

I'm interested in using the forwarder to communicate wtih sensors that can only communicate via Bluetooth, do you think I could use your implementation?

Amanda

[Michal Foksa]

Hi Amanda,

Feel free to use it.

I assume your sensors can talk mqtt-sn already. Then you have to create a simple message forwarder which:
1. Listens to a message on Bluetooth protocol,
2. wraps the message to Forwarder encapsulation packet and sends it to a broker. You need to find a unique ID as wireless node ID.
3. Message received from a broker have to be unwrapped and sent to a sensor according to wireless node ID.

Michal

[Amanda Mattiuz]

Hi, Michal,

Actually we will need to re-program the sensors so they can talk mqtt-sn, at the moment they talk some kind of proprietary protocol and use bluetooth for it. We can re-program the sensors, but we cannot add any other "radio", we must use bluetooth.

We were thinking about using mqtt-sn because we were under the impression that we would find some implementation ready to be used, but I guess we still have a lot of work to do.

In such case what you guys -  that are dealing with it for longer than us - think? Maybe I could just user plain MQTT? Is that even possible?

Amanda

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[Michal Foksa]

In that case I would create a gateway between sensors proprietary protocol and MQTT (instead of MQTT-SN).
With MQTT you have much more freedom with choice of client library and a broker.

Michal