I searched this forum for wireshark and got 0 hits.
If not, any other good tools already existing for displaying/logging RFM69 frames?
Wireshark is not for analyzing RF or serial data, the last time I checked. It's used for analyzing network traffic.
At a superficial level, yes, but it can go deeper than that and here's how. I'm thinking of the way freakduino did it, which would maybe illustrate. The procedure there was to set the 802.11.15 radio in promiscuous mode to capture frames, encapsulate those into ethernet packets (yes, I know, this sounds strange, but that's what wireshark digests), which then fed into wireshark, which tore the ethernet encapsulation away, and then very nicely displayed the frame data, payload, etc, contained within all nicely formatted. I have to say, it was very handy.
Again, this is not 802.11.15 or similar. It's FSK and the interface to the radio is through serial, through Moteino's atmega328 , through SPI, in that order.
Maybe you're in better luck with a RTL-SDR setup where you can capture the RF with a cheap SDR kit. I have one and only used it on a few occasions to look around at the spectrum where I'm at.
This looks like a good start for decoding FSK with an SDR: http://www.rtl-sdr.com/decoding-efergy-energy-monitor-signals-rtl-sdr/ (http://www.rtl-sdr.com/decoding-efergy-energy-monitor-signals-rtl-sdr/)
You might also be interested in this (http://uz7.ho.ua/packetradio.htm).
Sorry, I meant to say 802.15.4. The freakduino radio hardware was purely PHY and MAC.