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Implementation Roadmap

Revision: 1.1
Date: May 2026

This document orders work for developers and RF engineers. No implementation code lives in this repository — see repo-map.md.

Phase A — Contract and bench (no custom silicon)

Goal: Prove ZMQ contracts and repeater logic on commodity hardware.

Milestone Deliverable Owner skill
A1 ht-module-daemon stub: PUB fake IQ, REP ctrl, PUB status (Rust) Software
A2 repeater-supervisord lease + state machine per repeater-logic.md Software
A3 repeater-authd verify + audit per ota-remote-control.md Software
A4 GNU Radio 4 flowgraph: ZMQ SUB -> NFM demod -> optional cross-band (external repo) Software
A5 Reference RF bridge: adapt LinHT-utils zmq_proxy or SX1255 + GPIO PTT RF + software
A6 Fork f4exb/sdrangel: ZMQ sample source plugin spec implemented Software

Exit criteria: One band (70 cm recommended) repeats analog FM with PTT via ctrl; OTA command changes squelch on bench loopback; audit log entries written.

Phase B — Production module integration

Goal: Real HT13G-M / HT13G-S modules over I2S.

Milestone Deliverable Owner skill
B1 Kernel SAI/DMA driver or validated ALSA-DMA path Software / kernel
B2 ht-module-daemon production: SPI, EEPROM, PTT sequence per RF-modules.md Section 10 Software + RF
B3 gr-ht13g OOT: ht13g_source / ht13g_sink (C++/Python) Software
B4 Three-band status and per-band ctrl Software
B5 chrony + 1PPS VCTCXO trim closed loop RF + software

Exit criteria: All installed bands publish IQ at 500 kSa/s; TX timeout and PLL unlock tested on hardware.

Phase C — Site operations

Milestone Deliverable
C1 OpenWebRX+ parallel monitoring
C2 gr-ident + gr-linux-crypto on-air profiles documented per site
C3 mdadm, DRC GPIO, fuel gauge integration (README Sections 9–10)
C4 Optional SvxLink / AllStar audio bridge (adjunct, not core stack)

Phase D — Custom RFIC (parallel track)

Per RF-modules.md Section 11 (MPW). Does not block Phase A software.

Milestone Deliverable
D1 Phase 1 MPW VHF RX validation
D2 Integrated HT13G-M silicon on module PCB

Repository creation order

  1. ht-module-daemon (Rust) — runtime/ht-module-daemon.md
  2. repeater-control (Rust) — runtime/repeater-control.md
  3. gr-ht13g — runtime/gr-ht13g.md
  4. sdr-repeater-flowgraphs — runtime/sdr-repeater-flowgraphs.md
  5. sdrangel fork — runtime/sdrangel-fork.md

Names are suggestions; record actual URLs in repo-map.md when created.

Out of scope for Phase A–B

  • OpenRepeater / Supermagnum openrepeater (deprecated for this project)
  • Pi-Star images as primary stack (OpenDVM/MMDVMHost are alternate digital hotspot products only)
  • Implementation code commits in this spec repository