3 ms·

Yikes. All unencrypted I assume?

• genewitch 5y ago
  It's in an ISM band, I can't remember the rules, I think encryption is allowed (like, WPA) but for thermometers and stuff why bother? 99% of 433mhz (and 800/900 mhz) stuff is unidirectional (sensor to sensee), so where's the harm in some 100mW transmitter?
  • tzs 5y ago
    The only thing I've seen that appears to be encrypted is something rtl_433 identifies as a "Microchip-HCS200", which seems likely to be a device using this chip [1] for remote keyless entry systems. The encryption appears to be for authentication not secrecy. The button status is in an unencrypted portion of the message. Of course there may be plenty of sensors out there that fully encrypt in which case rtl_433 would probably not have decoders for them and so I would not see them at all. [1] https://www.microchip.com/en-us/product/HCS200 https://www.microchip.com/en-us/product/HCS200
    • genewitch 5y ago
      If you have an rtl anyhow and you want to see what is there that rtl_433 is missing is to use rtl_power on the command line, you can monitor specific chunks of bandwidth for as long as you want, and it saves as a CSV. btw if you try this and get a bunch of errors in the CSV (or NaN) your gain(s) are set incorrectly, and i'd try turning them down to start.