I hope you are all staying healthy
I have a commercial weather station that I am trying to interface. There is a sensor part, which sends the data through a RFM22B. On the other side, there is a USB stick, also containing a RFM22B (+ a 328p and a FTDI serial converter).
I would like to read the transmissions between the devices. Well, for fun and the curious kid in me :). I know the frequency is 434.0MHz. I hooked a RFM22B to a Mini 3.3V/8MHz and watched the frequency and - got nothing.
I already did a couple projects with RFM22Bs, so I have some experience. The particular sketch I am running (sorry, I am traveling and don’t have it with me. Will post asap) does receive data from other devices at the same time. It uses the RadioHead RF22 library and just waits for any transmission, in promiscuous mode (hence would not discard messages not addressed to itself).
I did some spectrum scans and can confirm that the center of the frequency is 434.0. Also, while monitoring the RSSI on 434.0, I can “see” the transmissions happening.
Unfortunately, I am not able to read them. The RF22 does not fill .recv() and does not trigger .available().
Do you have any idea what I could try to read/receive those transmissions? Every hint is appreciated