Re: [mosquitto-dev] Multiplexed MQTT

[Ian Craggs <icraggs@xxxxxxxxxxxxxxxxxxxxxxx>]

Hi Roger,

three bytes in front of each packet:

1. header - MQTT packet, or close session.  Obviously room for more 
commands.
2 and 3 - channel (connection number).  So up to 64k MQTT connections 
per socket.

Ian

On 27/02/15 20:30, Roger Light wrote:
> Hi Ian,
>
> Sounds interesting - how do you implement it?
>
> Cheers,
>
> Roger
>
>
> On Fri, Feb 27, 2015 at 3:34 PM, Ian Craggs
> <icraggs@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> > Hi All, and Roger especially.
> >
> > One function that is implemented (by Nick O'Leary, as it happens) in one of
> > the brokers in the RSMB repository is multiple MQTT sessions over one TCP
> > connection.  This was used for an MQTT-SN gateway of the transparent style.
> > Transparent means that each MQTT-SN connection arriving at the gateway
> > results in another MQTT connection, but using MQTT multiplexed over a single
> > socket, resources are saved.
> >
> > As I'm thinking about coding up an embedded MQTT-SN to MQTT gateway I
> > thought again how useful this could be.  So how about in Mosquitto?  It's
> > not in the MQTT standard, but that hasn't stopped us before, and the
> > standard can be driven by what people find useful.
> >
> > This sort of multiplexing could also be used in bridges, so that you could
> > have an MQTT connection which hopped over multiple bridges before getting to
> > its final destination.  I haven't thought that one through though, but it
> > sounds cool :-)
> >
> > --
> > Ian Craggs
> > icraggs@xxxxxxxxxx                 IBM United Kingdom
> > Paho Project Lead; Committer on Mosquitto
> >
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