You may find several resoureces on the web where people tried to decode Bresser Weather station data with an RTL SDR Stick.
In my opinion running a Rasp Pi just for decoding some RF Weather data is a overkill of resources.
There ought to be a smarter solution!!!
The Bresser Weather Stations transmits trhe data in an FSK Modulation:
You may find detailed information about the proticol here: or here. I cant explain it better than they did.
Based on this idea I started to search for a decoder and foudn a CC1101 Chip. I call it the swiss army knife of RF Recivers.
With this Receiver and the Lib Radiolib you may decode a lot of stuff easily.
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This is how the game begun:
With some help of the Twitter community I finally got it to work:
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