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Re: [mihini-dev] Greenhouse Demo access via m3da using the java api
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Hi Jürgen
The greenhouse use the M3DA protocol for publishing new values on the
m2m.eclipse.org server.
M3DA is a secure protocol for M2M communication (e.g. : tying to
reduce bandwidth usage), see the specification :
http://wiki.eclipse.org/Mihini/M3DA_Specification
You have a Java M3DA server there :
https://github.com/SierraWireless/m3da-server it's the code
m2m.eclipse.org is running.
There is also a client sub module so you can mimic the greenhouse behavior.
Once the data are published on the M3DA server you can retrieve them
using the provided HTTP/REST API like the JS application is doing.
There is a java/android example :
https://github.com/msangoi/phone-monitoring it's pushing monitoring
information (signal strength, gps position, etc..)
using M3DA.
HTH.
--
Julien Vermillard :::: http://people.apache.org/~jvermillard/
On Tue, Jul 23, 2013 at 4:43 PM, Jürgen Rose
<juergen.rose@xxxxxxxxxxxxxxx> wrote:
> Hi Benjamin
>
> Demo works again, thanks for that.
>
> I'm a bit confused, how does the rest api retrieves the data? I thought it
> gets it through the m3da interface?
>
> At the moment I just want to try out the m3da interface, REST is to easy :-)
> (by the way, why are there multiple entries for the values in the json
> response?)
>
> How would I retrieve it via the M3DA java api, can you make a simple
> example?
>
> What happens if somebody pulls the plug on the arduino? Is there any
> indication within the values that the underlying connection is lost?
>
>
>
> best regards
> Jürgen
>
>
>
> On 23.07.2013 16:20, Benjamin Cabé wrote:
>>
>> 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
>>>
>>> --
>>> IBH SYSTEMS GmbH
>>> D 85235 Pfaffenhofen an der Glonn
>>> Läutenring 43
>>> Geschäftsführer / CEO: Dr. Thomas Heitzig
>>>
>>> Amtsgericht München
>>> Handelsregister Nummer HRB 197959
>>> USt ID: DE267945175
>>>
>>> Office Munich
>>> D 80992 München
>>> Agnes-Pockels-Bogen 1
>>> T +49 89 18 9 17 49 0
>>>
>>> The information transmitted is intended only for the person or entity
>>> to which it is addressed and may contain confidential and/or pivileged
>>> material. Any review, retransmission, dissemination or other use of,
>>> or taking of any action in reliance upon, this information by persons
>>> or entities other than the intended recipient is prohibited. If you
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>>>
>>> _______________________________________________
>>> mihini-dev mailing list
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>>>
>> _______________________________________________
>> mihini-dev mailing list
>> mihini-dev@xxxxxxxxxxx
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>
>
>
> --
> IBH SYSTEMS GmbH
> D 85235 Pfaffenhofen an der Glonn
> Läutenring 43
> Geschäftsführer / CEO: Dr. Thomas Heitzig
>
> Amtsgericht München
> Handelsregister Nummer HRB 197959
> USt ID: DE267945175
>
> Office Munich
> D 80992 München
> Agnes-Pockels-Bogen 1
> T +49 89 18 9 17 49 0
>
> The information transmitted is intended only for the person or entity
> to which it is addressed and may contain confidential and/or pivileged
> material. Any review, retransmission, dissemination or other use of,
> or taking of any action in reliance upon, this information by persons
> or entities other than the intended recipient is prohibited. If you
> received this in error, please contact the sender and delete the
> material from any computer.
>
> _______________________________________________
> mihini-dev mailing list
> mihini-dev@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/mihini-dev
