Post #4158864

2026-07-28 08:39 UTC

The Radio Image Framing Protocol (RIFP) 1.0 is an experimental, extensible standard for sending images over low-rate radio links. The default rifp-cpfsk-4800 profile uses binary continuous-phase FSK and can be deployed around 433.92 MHz where local regulation permits it. RIFP itself is not tied to 433 MHz or to FSK and can be used in any frequency bands. I'm still exploring various low-cost options for a device that can receive and display images on an e-ink screen in emergency areas or similar environments. :github: Python implementation https://github.com/adulau/rifp Internet-Draft https://www.ietf.org/archive/id/draft-dulaunoy-rifp-00.html #radio #fax #433mhz #opensource

Replies (2)

@pedersen@c.im 2026-07-28 11:36

@adulau@infosec.exchange This looks like it has real utility. I look forward to seeing an actual emergency display from this.

Open ##4162532
@muddle@infosec.exchange 2026-07-28 21:25

@adulau@infosec.exchange I see mention there of "repeated frame transfer" and inserted random noise. Does that mean that the underlying connection needs to be two-way? Have you considered rateless error correction as a method of doing broadcast-only transmission? I've a couple of reasons for mentioning this. First, it's an area of interest of mine. Second, I have a bunch of 433MHz transmitter/receiver pairs. They're probably not applicable to this since they've got their own encoder/decoder circuitry (for RC use). They're probably easily enough hacked, though, to bypass that and just use the tx/rx parts directly. Maybe with a Pi Pico as an SDR?

Open ##4174164