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Re: [paho-dev] MQTT-SN talk at EclipseCon
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Il 17/03/2015 20:27, Ian Craggs ha scritto:
Stefano,
I think this is an interesting question. MQTT-SN, like MQTT is
publish-subscribe, which means messages are sent to topics rather than a
particular receiver. In MQTT, you have to connect to a server, so to
some extent that server becomes part of the destination of the message
along with the topic. The same thing happens in MQTT-SN when you
connect to a server.
But when you use QoS -1 in MQTT-SN, without a connection to a server,
then what does that mean? For a UDP implementation, you can send
messages to a particular multicast group, so you could say that that
group becomes part of the destination. Receivers of those messages can
forward them on, so that the message can reach a destination to which
the originator was not visible.
So, I think that MQTT-SN applications could take advantage of the
underlying transport's mesh networking capabilities. An application
could interpret a topic as containing a destination for instance, and
use the transport's capabilities to get it there.
Interesting. The paradigm of messaging is something that could be
applied to mesh networking, solving a few issues...
I need to start studying MQTT-SN. We've been working with MQTT only at
the moment and I'm really curious to see if SN can be an extension that
fits our more frequent needs: (1) internal communication between CPU
Boards in products (in situations where MQTT is already a solution for
interprocess and cloud connection) and (2) sub Giga networks of devices
with a very limited memory footprint, again where MQTT is a natural
choice for uplink to cloud.
Are you aware of a simple starting point for MQTT-SN (slideshow or
discussion)?
