Transceiver Protocol

Hi,

I would like to know which protocols are being used nowadays with the transceiver HopeRF RFM12 (not 12b).

Also, please let me know whether SNAP (Scalable Node Address Protocol) is still a popular choice or not, as it was developed quite a few years (more than a decade) ago.

Thanks!

In my question (above), I did not mention the specifications of the device I am using: it runs on 433 MHz and uses FSK. So what I'd like to know is whether a protocol exists for any device having these particular specifications.