Missing support for "Fine Offset Electronics WH24, WH65B, HP1000 & derivatives

[dclaar]

I'd like to see support for this protocol.

I know that this is open source, and I'm happy to contribute, but it's a little difficult figuring out how to start. Not the github stuff, or the tool chain, but more the structure of the files, what's a "SubGhzBlockConst", etc. I'm trying to wrap my head around the protocol files--and on translating rtl_433 to flipper--but I haven't found a lot of documentation yet.

I have an Ambient Weather 2902, and the sending unit identifies as "fineoffset-WH24" in rtl_433:

time      : 2023-12-29 19:30:32
model     : Fineoffset-WH24                        ID        : 49
Battery   : 1            Temperature: 13.2 C       Humidity  : 93 %
Wind direction: 43       Wind speed: 0.0 m/s       Gust speed: 0.0 m/s
Rainfall  : 2809.5 mm    UV        : 2             UVI       : 0
Light     : 0.0 lux      Integrity : CRC

It's at 915mhz. It's different than the current ambient_weather.c:

 * This decoder handles the 433mhz/868mhz thermo-hygrometers.
 * The 915mhz (WH*) family of devices use different modulation/encoding.

This protocol was added to rtl_433 in 2018, discussion of the signal is here.

The format is described as: "The sensor sends a package each ~16 s with a width of ~11 ms. The bits are PCM modulated with Frequency Shift Keying"

Thanks!

[skotopes]

@dclaar we need some RAW records first

[dclaar]

I ran it in RAW while rtl_433 showed several packets--and a bunch of unknown stuff--go by.
The RAW files seem very short, with just 1 chunk of RAW_Data. rtl433_output.txt corresponds to RAW-20240102-184902.sub.txt

rtl433_output.txt

[skotopes]

RAW files you recorded are useless. Looks like you were using incorrect modulation settings: rtl433 is suggesting FSK

[dclaar]

Ah, OK, I don't see an option for FSK. Maybe one of the FM settings?

This was kind of why I was hoping that someone had written a doc on "this is how you do this" so I wouldn't waste people's time. Here's one with each FM setting.
RAW-20240102-192241.sub.txt
RAW-20240102-192149.sub.txt

[skotopes]

yes FSK is subtype of FM

[skotopes]

Looks like default config is not going to work or this record was done incorrectly.

Does rtl433 shows you anything when you replay it from flipper?

[skotopes]

any updates?

[dclaar]

I'm stymied and frustrated. When I put the flipper right next to the transmitter, the RSSI indicator doesn't even twitch. There's no indication that it is receiving anything. When I replay the recording, nothing happens. But the unit is clearly transmitting: rtl-433 sees it. So I don't know where to go from here.