AFAIK you cannot buy a pre-flashed "Zniffer" but you can buy the Silabs dongle ACC-UZB3-E-BRG, for example, from DigiKey:   Please login or register to see this link.   Then follow the instructions in this topic to flash the Zniffer firmware and download the Zniffer app (which looks a bit like "Wireshark" but it is a Z-Wave specific app)     Warning 1: Silabs likes to "move" things on their website, so the actual links may be out of date and it may take some time to f