[rabbitmq-discuss] Simplest possible embedded message producer

Tue Mar 20 16:25:13 GMT 2012

Hi Jerry,

I have the hardware all sorted out - I'm using a Microchip ENC28J60,
which is somewhat less capable than Wiznet, but not terribly so.
(Working with SMD is fine, although the ENC comes in PDIP-28)

What I am looking for is help with the Rabbit / AMPQ side of things:
- What does a "minimum acceptable message" look like in XML?
- If someone has a template or two of one, that would be great - just
"hello world".

Thanks

On Mar 20, 11:49 am, Jerry Kuch <jer... at vmware.com> wrote:
> This answer is likely to be less interesting/applicable to many
> people than Tony and Simon's suggestions which can at least be
> done entirely in software, but...
>
> You could embrace the option of offloading more of the work into
> another piece of hardware the way the Ethernet shields for Arduino
> boards (also based on the ATmega family of microcontrollers) work.
>
> For your network connectivity you could use an (almost, modulo
> probably power supply) all in one part like the Wiznet W5100,
> which gives you a TCP and UDP supporting IP stack baked into an
> Ethernet chip.  Your could would then talk to this thing via SPI,
> something that at least will fit on the ATmega side...
>
> If you're using Arduino, you can buy most of this stuff pre-made.
> If not, it's probably a few afternoons of breadboarding and debugging,
> although IIRC the Wiznet only comes in a tiny surface mount package
> that might be annoying to work with, depending on how you're equipped.
>
> Best regards,
> Jerry
>
>
>
>
>
>
>
> ----- Original Message -----
> From: "Tony Garnock-Jones" <tonygarnockjones+rabbi... at gmail.com>
> To: "Simon MacMullen" <si... at rabbitmq.com>
>
> Cc: rabbitmq-disc... at lists.rabbitmq.com, "Dirk" <dirk.sw... at gmail.com>
> Sent: Tuesday, March 20, 2012 8:30:08 AM
> Subject: Re: [rabbitmq-discuss] Simplest possible embedded message producer
>
> The other option would be to use UDP and build a trivial UDP-accepting plugin for RabbitMQ, thus moving almost all of the complexity and memory-requirements onto the server. (Actually that'd be a nice feature to have in general.)
>
> On 20 March 2012 11:13, Simon MacMullen < si... at rabbitmq.com > wrote:
>
> And if rabbitmq-c is still too big, and all you need to do is publish messages from the tiniest client possible, you might want to look at STOMP - you could probably write a minimal publish-only client quite simply, and it would be pretty small.
>
> Cheers, Simon
>
> On 20/03/12 15:06, Alan Antonuk wrote:
>
> I'm not sure AMQP/rabbitmq-c client would be able to run on that
> constrained of a system (someone else on this list might correct me though).
>
> In general you're going to need a TCP/IP stack so you can connect to the
> broker, then enough memory to hold a couple frames (the minimum frame
> size is 4096 bytes). You could probably do it with smaller buffers but
> it's not something done with most client libraries.
>
> If that all will fit in your constrained system, I would probably pick
> apart the the rabbitmq-c library and pare it down to something that does
> the minimum you need. Then again I'm not experienced with development of
> embedded devices, so I'm not sure how people typically accomplish these
> things.
>
> HTH
> -Alan
>
> On Mon, Mar 19, 2012 at 11:41 AM, Dirk < dirk.sw... at gmail.com
>
> <mailto: dirk.sw... at gmail.com >> wrote:
>
> - Does anyone have code for the simplest possible message producer?
>
> I would like to produce messages from a _very_ memory constrained
> embedded system*. Can anyone advise me on what the absolute minimum I
> have to do to produce and send a message is?
>
> Also, if anyone can point me towards what a simple "hello world"
> message template looks like, it would be appreciated. More details:
> I'm thinking of the sort of message that the Tutorials cover (eg:http://www.rabbitmq.com/tutorials/tutorial-one-python. html )
>
> Thanks in advance - I'm a Rabbit noob, apologies if this post is not
> using the correct terms.
>
> * ATMega 328p, same chip the Arduino uses.
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> --
> Simon MacMullen
> RabbitMQ, VMware
>
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