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Re: [mihini-dev] Greenhouse Demo access via m3da using the java api
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Hey Jürgen!
Sorry the demo was stuck indeed, I just restarted it.
The mihini app is indeed pushing M3DA tcp messages to m2m.eclipse.org on
port 44900, using an efficient serialization model and stuff. But, as
opposed to MQTT, M3DA is not really a publish/subscribe protocol which
means that for reading the data of a given client, you'll usually want to
use a different API, in our case we have a REST API on
http://m2m.eclipse.org/m3da for doing this.
The details on how to interact with the greenhouse (get data / send
commands) via this very API are available on
http://wiki.eclipse.org/Machine-to-Machine/M2MIWG/Demonstrator#REST_API
(which is actually *the* page where you're supposed to find all the doc, Š
I guess it wouldn't hurt to reference it from the m2m.eclipse.org web page
:) )
Please let me know if you need more info, I'd be happy to help!
Benjamin--
Le 23/07/13 16:14, « Jürgen Rose » <juergen.rose@xxxxxxxxxxxxxxx> a écrit :
>Hi,
>
>I want to try to access the greenhouse demo via m3da. I actually have no
>idea how.
>
>By the way, if you look at
>http://m2m.eclipse.org/portalTest/webapp/app/#/devices/RPI000000006f257df2
>,
>the values seem to be stuck, all dates are not changing from July 23rd
>00:35:29
>
>Ok, just to explain what I tried:
>
>As far as I understand, there is a M3DA server running on
>m2m.eclipse.org at port 44900
>
>This is the same server which is the base for the web GUI, correct?
>
>What I try to do, is to get the greenhouse temperature.
>
>There I'm starting to become confused, the java client doesn't offer any
>way to subscribe to a tag.
>
>Is it then always request/response driven? So I would have to poll for
>value changes?
>
>I tried something like this:
>
>public class Application
>{
> public static void main ( final String[] args ) throws Exception
> {
> final M3daTcpClient client = new M3daTcpClient (
>"m2m.eclipse.org", 44900, "openscada.org#1" );
> client.connect ();
> final M3daBodyMessage[] x = client.sendEnvelope (
>createMessages () );
> System.out.println ( x );
> System.out.println ( x.length );
> client.close ();
> }
>
> private static M3daMessage[] createMessages ()
> {
> final Map<Object, Object> map = new HashMap<> ();
> map.put ( "A1", "ON" );
> return new M3daMessage[] { new M3daMessage ( "greenhouse",
>Math.abs ( new Random ().nextLong () ), map ) };
> }
>}
>
>This maybe total nonsense but I just dont find any documentation for the
>greenhouse demo, even the source code parts I managed to find, seem
>incomplete to me.
>
>What is the path?
>
>What is the name of the tags?
>
>Is there a way to query/browse the server for existing tags?
>
>
>
>Best regards
>Jürgen
>
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