ESP32-P4_DANTE/components/dante

components/dante

Clean-room Dante protocol support for the ESP32-P4, written independently from the behavioural notes in docs/dante-protocol-notes.md.

Licensing: this component is Apache-2.0 and must stay clean-room. It is implemented from understanding of Dante's on-the-wire behaviour, never by copying, translating, or closely paraphrasing reference/inferno (GPL/ AGPL). See the hard rule in CLAUDE.md.

What's here now

Discovery (dante_discovery.h)

Read-only mDNS/DNS-SD browsing for Dante devices. It queries the four Dante service types (_netaudio-arc, _netaudio-cmc, _netaudio-chan, _netaudio-bund) and reports each instance found — hostname, IP, port, and TXT records — via a callback, or logs them if no callback is given.

• dante_discovery_scan() — one-shot synchronous sweep.
• dante_discovery_start() / dante_discovery_stop() — background scanner that repeats on an interval.

This does not advertise this device and does not touch audio, so it is safe to run on a live Dante network. It's primarily a bring-up aid: it shows what Dante gear is present and how its channels are formatted (sample rate, bit depth, latency, fpp), which is exactly what you need when getting AES67 interop working.

It shares the process-wide ESP-IDF mDNS instance with the AES67 stack (it only ever queries; it never frees mDNS).

Enabling

Controlled by Kconfig (idf.py menuconfig → Dante):

• DANTE_DISCOVERY_ON_BOOT (default y) — main starts the background scanner once the network is up.
• DANTE_DISCOVERY_INTERVAL_MS (default 15000) — sweep interval.

Not yet implemented

Everything past discovery, in rough dependency order (see the protocol notes):

• Advertisement — publishing _netaudio-arc/-cmc/-chan/-bund so Dante Controller sees this device. Deliberately not done yet: an advertised device that can't answer ARC/CMC queries is worse than an invisible one.
• CMC server — device-announce request/response (port 8800).
• ARC server — capability + channel enumeration and the name-based subscription (routing) model (port 4440).
• Flow control (dbcp) — open/update/stop audio flows with keepalives (port 4455).
• Media framing — the 9-byte-header Dante media packets ↔ our I2S engine.
• PTPv1 — the legacy Dante clock (see CLAUDE.md "Known hard problems").

Status

Compiles as an ESP-IDF component but is not yet build-verified (no ESP-IDF toolchain in the dev environment where it was written) and untested against real Dante hardware.