Off-grid and independent comms for Chicagoland. We build and document the tooling that makes radio hardware usable — mesh networking, DMR/GMRS codeplugs, and reverse-engineered vendor formats — and we publish it so nobody else has to rediscover it.

Web: https://chicagooffline.com · Live packet analyzer: https://scope.chicagooffline.com

• codeplugger — Codeplug generator. SSRF-Lite data + a profile → importable files for NeonPlug, qdmr, dmrconfig, and friends.
• ssrf-lite — YAML spec for describing spectrum resources, plus a data library of known channel plans, repeaters, DMR talkgroups, antenna systems.
• chioff-ssrf-shared — SSRF-Lite overlay for the Chicago Offline community nets (GMRS/MURS).

flowchart LR
    SSRF["ssrf-lite<br/><i>what's on the air</i><br/>channel plans, repeaters,<br/>talkgroups"]
    OVER["chioff-ssrf-shared<br/><i>local overlay</i><br/>Chicago GMRS/MURS nets"]
    PROF["profiles<br/><i>what this operator wants</i><br/>zones, scan lists, priorities"]
    CP{{"codeplugger<br/><i>generator</i>"}}
    CPS["CPS import files<br/>NeonPlug · qdmr · dmrconfig"]
    FLEET["radio fleet<br/>DM-32UV · MateTalk P4 · BF-888"]

    SSRF --> OVER
    OVER --> CP
    PROF --> CP
    CP --> CPS
    CPS --> FLEET

Spectrum data and operator intent stay in separate repos, so the same RF facts feed every radio and a profile change never means re-describing the band plan.

• dm32-info — Baofeng DM-32UV reference: specs, programming tools, firmware version tracking.
• bf888-info — Baofeng BF-888/888S image format, channel memory layout, CHIRP CSV notes.
• retevis_matetalk_p4 — Retevis MateTalk P4 protocol reverse engineering.
• p64tool — fork of an opensource p64tool, adding support for the MateTalk P4

• emuehlstein/meshcore — A meshcore release preconfigured with mqtt reporting and chicagoland radio settings
• emuehlstein/chioff-rns - An rns server deployed to AWS via code

Issues and PRs welcome on any repo. If you're in Chicagoland and want to put a node on the mesh, start with the radio parameters above and open an issue or come chat with us on the ChiMesh Discord.