Extend FineOffset decoder to support the WH32-Indoor (like WH32 but also has pressure)

[sdalu]

Device[1] is not decoded by the fineoffset.c it is certainly a variation of the Fineoffset WH32 model.

Packet retrieved using rtl_433 -f 868.35M -A -X 'n=Ecowitt,prio=9,m=FSK_PCM,s=58,l=58,r=3000,preamble=aaaa2dd4'

{98}e6f24c3626961604100000000
{98}e6f2503426961804100000000
{98}e6f2503426961804100000000
{98}e6f2503426951704100000000
{98}e6f2503426951704100000000
{98}e6f2513426971a04100000000
{98}e6f2553226820704100000000

Seems to decode well (at least for temperature, humidiy, pressure) with: TYPE:4h ID:8d FLAGS:2b TEMP_C:10d HUM:8d HPA:16d CHK:8h

[1] https://www.ecowitt.com/shop/goodsDetail/193#

[zuckschwerdt]

What is the packet length without trimming the preamble? There are some checks on that here, you might get it to work by tweaking that https://github.com/merbanan/rtl_433/blob/dc95819b3d59aa73ebd59d6e38f1df5cec8e3500/src/devices/fineoffset.c#L476-L480

[sdalu]

Looks like 169 bits :

{169}ab5555555555545ba9cde4ac624d000a08200000000
{169}ab5555555555545ba9cde4ac624d020c08200000000

If I remove package validation and force type = 32 https://github.com/merbanan/rtl_433/blob/dc95819b3d59aa73ebd59d6e38f1df5cec8e3500/src/devices/fineoffset.c#L475-L484

and bitsearch at index 0 instead of 100 https://github.com/merbanan/rtl_433/blob/dc95819b3d59aa73ebd59d6e38f1df5cec8e3500/src/devices/fineoffset.c#L489

I got:

time      : 2022-12-12 15:43:43
model     : Fineoffset-WH32B                       ID        : 111
Battery   : 1            Temperature: 19.7 C       Humidity  : 49 %          Pressure  : 985.3 hPa
Integrity : CRC

Which is correct (well, no idea about the ID field). Model on the backside of the device says WN32AP (but it could be ecowitt specific)

[zuckschwerdt]

Thanks. The branching there isn't ideal anyway, I'll need to check if we can just run all 3 decoders always.

[gdt]

Is this the same as #2303?

[sdalu]

@gdt kind of the WH32 indoor[1] is the WH32[2] with pressure sensor added. 1: https://shop.ecowitt.com/products/wh32-indoor 2: https://shop.ecowitt.com/products/wh32-outdoor

[gdt]

Can you test with current git master? It seems like someone needs to extend the decoder, assuming the format is longer. (I am trying to push people to create PRs from issues so we can have improved code and close the issues.)

[Mart124]

Also bought this WH32P, which is not recognized (model at the backside also says WN32AP). All my other WH31 work flawlessly though. Any progress perhaps on this fix ? May we help somehow ? Thank you very much 👍

[zuckschwerdt]

This was partially addressed with #2303. We need a sample to finally add WH32P support. https://triq.org/rtl_433/ANALYZE.html Check with https://triq.org/pdv/ and upload as zip here.

[Mart124]

So ! Here are 4 samples : 2274.zip

At this time, sensor values were : 20.1°C / 60% / 1029.0hPa 20.1°C / 66% / 1028.9hPa 20.2°C / 67% / 1028.9hPa 20.3°C / 73% / 1029.0hPa

Of course feel free if needed ! Thank you 👍

[Mart124]

Just to be sure, are my samples above clean enough to go further ? Of course do not hesitate if you need additional ones ! Thank you again 👍

[zuckschwerdt]

Thanks! The samples work. If you look at the spectrogram you can see that two samples (001 & 002) have a weaker signal nearly colliding. There is a rogue carrier at 868 MHz exactly -- you might want to tune up (-f 868.5M) to get rid of that. Overall the signals are clipping somewhat ("too loud"), but rtl_433 can still handle that.

[Mart124]

Many thanks for your feedback @zuckschwerdt, good news 👍 I had the sensor at about 1 or 2cm from my receiver (without its antenna) to get these samples, certainly the cause of the "too loud" signals :) Feel free if you want / need additional samples with -f 868.5M.

[Mart124]

Did not initially gave a try, but I confirm that last nightly build gives proper values :

C:\...>rtl_433.exe -S known -f 868.34M -s 250k
rtl_433 version -128-NOTFOUND branch  at 202312291305 inputs file rtl_tcp RTL-SDR SoapySDR

New defaults active, use "-Y classic -s 250k" if you need the old defaults

Found Rafael Micro R820T tuner
[SDR] Using device 0: Realtek, RTL2838UHIDIR, SN: 00000001, "Generic RTL2832U OEM"
Exact sample rate is: 250000.000414 Hz
[R82XX] PLL not locked!
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2024-01-30 21:40:29
model     : Fineoffset-WH32B                       ID        : 157
Battery   : 1            Temperature: 19.7 C       Humidity  : 56 %          Pressure  : 1032.2 hPa
Integrity : CRC
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2024-01-30 21:40:29
model     : Fineoffset-WH32B                       ID        : 157
Battery   : 1            Temperature: 19.7 C       Humidity  : 56 %          Pressure  : 1032.2 hPa
Integrity : CRC
*** Saving signal to file g001_868.34M_250k.cu8 (46280 samples, 131072 bytes)

g001_868.34M_250k.cu8.zip

Perhaps we could then close this issue, not sure if there's still something to do here 🤔 (but the sensor name, WH32B vs WH32P, not sure it is important though).

Thank you again !

[gdt]

This seems ready to close. Yell if not.