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v1.0b — First working release (beta)

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@n0mjs710 n0mjs710 released this 25 Apr 01:26
· 77 commits to main since this release
v1.0b
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ipsc2hbp v1.0b — Beta

A bidirectional, single-process Python 3 protocol translator that connects one Motorola MOTOTRBO repeater (IPSC peer) to one upstream DMR network server (HomeBrew Protocol master — BrandMeister, DMR+, HBlink4, etc.).

This replaces the legacy two-process Python 2 chain (DMRlink IPSC_Bridge + HBlink HB_Bridge communicating over a local UDP socket) with a single Python 3.11+ process that translates directly in memory.

Status

Minimally working. Both directions of voice have been tested live against a real Motorola MOTOTRBO repeater and a real HBP master. Audio is clear end-to-end. AMBE round-trip has been verified lossless (0 bit errors across 48 SLOT_VOICE bursts). The bridge has been running under systemd without incident.

This is a beta release. We believe it is solid, but it has not been tested across a wide range of repeater models, firmware versions, codeplug configurations, or network conditions. Please report bugs.

What works

  • IPSC master stack — registration, keepalive, watchdog, HMAC-SHA1 auth
  • HBP peer stack — full handshake (RPTL/RPTK/RPTC/RPTO), keepalive, reconnect on any disconnect
  • Outbound voice: IPSC GROUP_VOICE → HBP DMRD (VOICE_HEAD, SLOT_VOICE all burst types A–F, VOICE_TERM)
  • Inbound voice: HBP DMRD → IPSC GROUP_VOICE (VOICE_HEAD, SLOT_VOICE all burst types, VOICE_TERM)
  • TRACKING mode: HBP connects/disconnects with the IPSC peer
  • PERSISTENT mode: HBP stays connected regardless of IPSC peer state
  • --wire capture mode for AMBE round-trip diagnostics

Known limitations / out of scope

  • Group voice only — private calls are not translated
  • Single repeater, single network — one IPSC peer, one HBP master
  • No TGID or timeslot rewriting — translates what it receives
  • No data calls — GROUP_DATA and PVT_DATA are silently dropped
  • No burst timeout watchdog — if a call loses its VOICE_TERM, the bridge waits for the repeater to resolve it

See theory_of_operation.md in the repository for full protocol and architecture documentation.

Requirements

  • Python 3.11+
  • dmr-utils3 and bitarray (pip install -r requirements.txt)
  • See INSTALL.md for setup and systemd configuration

Bug reports

Please open an issue at https://github.com/n0mjs710/ipsc2hbp/issues and include:

  • Repeater model and firmware version
  • HBP master (BrandMeister, DMR+, HBlink4, other)
  • Log output at DEBUG level (--log-level DEBUG)
  • If audio-related: a --wire capture if possible
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