Hi @Gabri74,
while I cannot tell you anything about the Aurel 868 MHz Transceiver, using a CC1101 here and think it’s currently the only transceiver working with rtl_433_ESP, depending on what Bresser weather station you have it could be included in the rtl_433_ESP FSK test branch.
If you have either bresser_5in1.c, bresser_6in1.c or bresser_7in1.c you might have similar problems as I experience with my Fine Offset rebranded weather station, also being FSK_PULSE_PCM modulation, which doesn’t seem to decode properly yet.
If you have the bresser_3ch.c though, everything should be fine, and this OOK_PULSE_PWM modulation decoder is already included in the default rtl_433_ESP branch.
All the best and let us know how you get on.