Concept Board - Java ME - bi-directional data communication | Telit Cinterion IoT Developer Community

August 28, 2014 - 6:22pm, 13899 views

Java

Hi, I know in a IoT data communication from/to an edge-device from/to a gateway or directly to the cloud happens using e.g. a message broker (e.g. MQTT AMQP based) on the gateway or in the cloud, CoAp, REST services (on a gateway or in the cloud), .... Since, as far as I know, Java ME 3.x has no standard out-of-the-box facilities for consuming REST services and I don't know of any MQTT or AMQP clients for JavaME to communicate with a message broker what is the recommended/most used method for sending sensor data from the EHS6 (Concept Board) to the cloud and receiving data from the cloud to command actuators connected to the board? Thanks.

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Jędrzej Gemalto...

Aug 28 2014 - 7:57pm

Hi, Gemalto offers own cloud computing system for such purposes - Sensor Logic platform. Please find details in information webpage: http://m2m.gemalto.com/application-enablement.html Here you can find an example SL application published by our Sensor Logic experts: https://iot-developer.thalesgroup.com/threads/getting-started-sensorlogi... Best regards Jedrzej

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gdillen

Aug 28 2014 - 8:16pm

Hi, Ok Thanks. But the data from/to the EHS6 (concept board and afterwards a terminal module) is only part of a global solution. For the other parts we use Microsoft Azure as PAAS/IAAS. You'll understand that we don't want ending up with a dozen of different IoT cloud platforms. Best regards, Guy

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Jędrzej Gemalto...

Aug 29 2014 - 2:15pm

Hi, Gemalto provides API only for Sensor Logic platform, but there is nothing against implementing your own solution based on available network protocols. The design is up to you. Regards Jedrzej

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gdillen

Sep 1 2014 - 4:10pm

Hi Jedrzej, No offense, I only wanted to point out that having several Cloud solutions makes it only more complex. I have one additional question: I want to use an MQTT broker with an MQTT Client (running on the EHS6 (Concept Board). I suppose the Java ME SDK used by Gemalto is 3.2. For building the MQTT Client I normally also need SDK 3.2. Problem: on the Oracle site only SDK 3.4 is available for download. Should this also work (fully compatible) or is SDK 3.2 absolutely necessary; if yes any idea where I can get SDK 3.2? Thanks. Guy

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Jędrzej Gemalto...

Sep 3 2014 - 1:32pm

Hello, the platform is based on Oracle Java ME Embedded 3.2 and compliant to CLDC 1.1 HI (JSR139) and IMP-NG (JSR228). It additionally provides support for following Java standard APIs: - JSR75 (FileConnection) - JSR177 (CRYPTO) - JSR280 (XML) All developer tools are provided with install CD so you don't need to download it separately. Supported compiler compliance level is 1.3 and 1.4. If your MQTT client code is compliant to these technologies it can be used, but remember that the code must be compiled with provided by Gemalto tools according to guidelines from Java Userguide. Regards Jedrzej

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gdillen

Sep 5 2014 - 9:35pm

Hi, Thanks. I'm rather new to J2me development (and i know this forum is not a j2me programming forum), the only thing i would like asking is can you please give me just a starting point for building this MQTT library (and I suppose this approach would be valid for other external libraries too): can I use the with Gemalto Cinterion provided Eclipse IDE or can I only build this from the command prompt? Thanks. Guy

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Jędrzej Gemalto...

Sep 8 2014 - 1:41pm

Hello, it depends on how big the sources are. If it's not big project, I would start with pasting client source files to MIDlet project (created e.g. in Eclipse and configured according to Java Userguide) and verify if all dependencies are resolved. If there were some import errors, I would perform deeper investigation. If building scripts produce JAR library file to be imported by target application, it should be possible to configure them to try to compile files using Java installed with EHSx SDK. If build succeeded, I would try to add external JAR to build path in target MIDlet project. Best regards Jedrzej

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gdillen

Sep 11 2014 - 11:18pm

Hi, "...but remember that the code must be compiled with provided by Gemalto tools according to guidelines from Java Userguide." I suppose you mean here more precisely chapter 9 "Compile and run a Program without a Java IDE"? Since the examples are all MIDlets, can the same procedure be used for a (non-MIDlet) library? Thanks. Guy

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gdillen

Sep 12 2014 - 3:56pm

Hi, I started trying building the demo HelloWorld app. It builds an executable jar file but gives errors related to the jad file. See below. C:\Users\Public\Cinterion\EHS5 WTK Examples\WTKSamples\helloworld>build ------------------------------------------------------------------------------- Building release version "helloworld" ... ------------------------------------------------------------------------------- Compiling... warning: [options] source value 1.3 is obsolete and will be removed in a future release warning: [options] target value 1.3 is obsolete and will be removed in a future release warning: [options] To suppress warnings about obsolete options, use -Xlint:-opti ons. 3 warnings Preverifying... Preparing manifest... Error: Failed to write jad file WTKSamples/helloworld/helloworld.jad Error: Failed to write jad file WTKSamples/helloworld/helloworld.jad Packaging... Updating jad file... Error: Failed to write jad file WTKSamples/helloworld/helloworld.jad Error: Failed to write jad file WTKSamples/helloworld/helloworld.jad C:\Users\Public\Cinterion\EHS5 WTK Examples\WTKSamples\helloworld>

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Jędrzej Gemalto...

Sep 12 2014 - 6:00pm

Hi, you probably don't have write access to this directory. One hint - it is possible to compile JAR library with Eclipse IDE in following way: 1. Start new MIDlet project according to Java Userguide 2. Define your classes/paste the files 3. Deploy package 4. Take created JAR file wherever you want, ignore JAD. Then you can add external JAR file in your MIDlet project. Remember to add it to exported packages (Order and Export pane). Regards Jedrzej

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