Support Mode N WmBus to allow wmbusmeters project to support Honeywell TPR11 Merlin 169 WmBus

[dwojciec]

rtl-wmbus supports mode T1, mode C1 and mode S1 but not mode N as mentioned here wmbusmeters/wmbusmeters#321. With the Support of mode N wmbusmeters project could benefit from it.
All informations relative to Mode N (wmBus) are welcome to evaluate the complexity of packet decoding project of mode N.

[merbanan]

@dwojciec can you record some signal samples? If so I would be able to add decoding support via rtl_433.

[dwojciec]

@dwojciec can you record some signal samples? If so I would be able to add decoding support via rtl_433.

Hi @merbanan thank for your support. Do you have some command you could share with me to take record of my signal ? and where can I upload them once recorded ?

[merbanan]

rtl_433 -f 169500k -s 1600000 -S unknown

That should work.

https://www.silabs.com/documents/public/application-notes/an1119-rail-wmbus.pdf

The above pdf lists the different frequencies that should be in use. The rtl_433 command should cover the whole band but you also might need to do offset tuning and then you need to tune to 169.3MHz or 169.7MHz or so.

You can also let rtl_433 try to automatically recover the bits by adding a -A command.

The sample files (*.cu8 files) you get you can attach to a github ticket. Either you open a new issue in rtl_433 or here. I will most likely add the signal samples to the rtl_433_tests signal repository. Then anyone who want to add support can use them as development base.

[dwojciec]

I tried to generate files using this command :
rtl_433 -f 169728051 -s 1600000 -S unknown -A
and
this other command
rtl_433 -f 169328051 -s 1600000 -S unknown -A
Result are into the zip files attached.
file-generated.cu8.zip

[merbanan]

I looked through the files and found nothing. Can you use something like gqrx and try to locate the signal in frequency? And try and change to -S all. If possible place the transmitter close to the rtl-sdr hardware and then remove the antenna.

[merbanan]

The device might also need to adjust the gain parameter (-g).

[tonioa]

hi, i have generated some record of my signal, if it can help to go forward, thanks
My command: rtl_433 -f 169M -S unknown
https://we.tl/t-32CowtbFvq

[davemajor]

I was just about to jump in as well! I recorded some samples using the above command. It's from (I hope) my Italian water metre which outputs mode-n.

mode n.zip
!

[merbanan]

I will check the samples when I get the time.

[merbanan]

I checked all samples and there was nothing more then noise found. I suspect that this method does not work well for signal reception. I will try some other options to see if I can get some better results.

[tonioa]

I have relaunch new trace with this command: rtl_433 -f 169500k -s 1600000 -S unknown
If it can help
https://we.tl/t-2Em4gfJu0z
Thanks

[bend94]

Hi,

My new house is almost ready. I have an ARROW WAN MVM 169. See picture

I would like to know if it is possible de decode the signal in order to read my water consumption

For documentation :
"Arrow WAN MVM 169 use vM-Bus protocol"

Thanks for your help
Regards

[bend94]

hi
i did some research on internet.
My water counter ARROWWAN MVM 169 MHz use Frequency range: 169.400 MHz to 169.475 MHz.
I plugged a RTL2832 usb key in my raspberry pi

The RTL2832 seems to be capable of reading from 64MHz to 1.7GHz

Now, need help, looking for a procedure "how to install" software part (rtl_wmbus)
if someone can help, it could be great !
Regards