WMBus binding

[Chris]

Hi there,

I'm new to OpenHAB and spent the last 2 months getting familiar with the features and the OpenHAB designer.

Now I wanted to start with trying to implement a binding for Wireless M-Bus and was asking myself if anyone out here tried the same or has already finished such a binding.

Besides it would be great to get some directions if I encounter any problems. In such a case I will post my issues here.

Greetings

Chris

[Thomas Eichstädt-Engelen]

Hi Chris,

that's good news :-)

Could you please add an issue for this binding? All technical discussions regarding MBus should then took place in this issue. It should also contain your rough implementation idea and libs you are going to use!

Thanks for contributing to openHAB and don't forget to vote at the IoT challenge (see news section) ;-)

Regards,

Thomas

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[Chris]

Hi Thomas,

a issue for this binding has been posted in the issue tracker. I hope I didn't forget anything. ;-)

Regards, Chris.

[Thomas Eichstädt-Engelen]

Hi,

looks good! Are there any implemented "driver" libs you are going to use?

Regards,

Thomas

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[Lars Bretschneider]

i would like also to have some m-bus binding in the past i found an interesting project (also a lib for m-bus) at:
http://www.openmuc.org/index.php?id=11 and its also on ogsi basis i found now out in the past i think they didn´t told... so it could be interesting to connect both systems...

 i would like to connect to me energy meters from my heating system ;-)

[Thomas Eichstädt-Engelen]

i mentioned openMUC in http://code.google.com/p/openhab/issues/detail?id=303.

Thanks, Lars for mentioning!

[Chris]

Hi,

Although I have starting problems due to creating a binding skeleton with maven, I also have looked around for some libs to use. The main problem is, that i already have a library, but it's written in c# and not in java. I assume normal modbus libs will not be very helpful, because the whole communication is different from wireless modbus.

Regards,

Chris

[Chris]

Hi everybody,

after a long time of silence I've managed to implement the binding for WMBus and now I'm going to test everything.

But I stumbled upon one little issue: I can not find any place where to define the keyword for my binding in order to use it for items in the designer. Can anybody tell me where to define this kind of keyword (like "serial=COMX" when using the serial-binding)?

Besides that, is there any other hint to which details I should pay attention to when testing my binding?

Until now I only managed to get the binding started in the runtime (logging shows the binding activator class), but even if I create an item for "wmbus=COMX", nothing happens, no logging from the device class...

I hope you're able to help. It's almost done!

greetings

Chris

[Kai Kreuzer]

Hi Chris,

The information you are looking for is in the xml file in the OSGI-INF folder (the so called "declarative services component descriptor") - the "wmbus" identifier must be gives as the service.pid property with an org.openhab prefix, i.e. "org.openhab.wmbus".

If you use the Maven archetype to generate a binding skeleton, this is all setup for you.

Best regards,

Kai

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[Chris]

Hi everyone,

I'm now able to use my binding with openHAB, but there are still issues to solve.

This time I got a problem with using the java.security library for decrypting the AES/CBC encoded frames coming from the W-MBus devices.

I use a method for decryption as shown below. But everytime i try a .doFinal() on the encrypted frame part i get a BadPaddingException.

I do know that the frame part must be of n*16 bytes. Any suggestions?

The Code:

public static byte[] AES_decryption(byte[] aESblocks, byte[] coronaKey, AlgorithmParameterSpec ivSpec) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException
{
Cipher a = Cipher.getInstance("AES/CBC/NoPadding");
byte[] aesPlain = new byte[aESblocks.length];
byte[] encrypted = new byte[16];
byte[] decrypted = new byte[16];
Byte[] plain = new Byte[16];
SecretKeySpec sKeySpec = new SecretKeySpec(coronaKey, "AES");
a.init(Cipher.DECRYPT_MODE, sKeySpec, ivSpec);

for (int i=0;i<aESblocks.length/16;i++)
{
System.arraycopy(aESblocks, 16*i, encrypted, 0, 16);
WriteConsole("Encrypted Bytearray", encrypted);
decrypted = a.doFinal(encrypted);

for (int j = 0; j < 16; j++)
plain[j] = (byte)(ivSpec.toString().getBytes()[j] ^ decrypted[j]);

System.arraycopy(plain, 0, aesPlain, 16*i, 16);

System.arraycopy(encrypted, 0, ivSpec, 0, 16); // New initialisation vector
logger.warn("number of successful decrypted blocks: " + i);
}
return aesPlain;
}

[frank....@gmail.com]

Hi Chris,

Any update on the Wireless M-Bus binding that you were creating? We use the Fast Forward EngeryCAM RF modules (see attachment) and I would like to be able to read the data from within openHAB. Is there any particular Wireless M-Bus master that you are using for testing your binding? I've come accoss some USB sticks that could be used but haven't bought any for the moment.

Best regards,

Frank

[Christoph Parnitzke]

Hi Frank,

I'm sorry to say, but I am not longer working on openHAB since spring 2013. My contribution began through my job as a student which I quit back then.
Now I am studying computer science and my actual work is about software development.
Therefore I am not able to help you or give you further information, because I am sadly not able to regain my memory from back then.

Good luck with your work!

Regards,
Chris

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