Suunto Nautic: device info + decode fixes (devinfo, dive mode, RBT, HR, surface temp) - #4
Merged
Merged
Conversation
A short fetch of GET /Info returns a device-identity record — confirmed on a live Nautic (firmware 2.55.46): Suunto\0 Nautic\0 Vaasa\0 T\0 2604C3003306\0 ... 2.55.46 ... in one 303-byte DATA frame. Take the first "N.N.N" token as the firmware and the first 12-char uppercase-hex token (which precedes the firmware) as the serial, and announce them via DC_EVENT_DEVINFO. Best-effort — every failure path is non-fatal. dc_event_devinfo_t is unsigned-int only, so the firmware is packed (a<<16)|(b<<8)|c and the hex serial truncated to its low 32 bits.
The parser never answered DC_FIELD_DIVEMODE, so the consumer was left with the dc_divemode_t zero value -- FREEDIVE -- and every scuba dive imported as an apnea dive (seen on nandodiver's captures, deepsealabs/libdc-swift#29). Read the CHUNK_ACTIVITY (0x08) sport id -- the app's ActivityType, e.g. 51 scuba, 61 free diving, 62 mermaiding -- and map 61/62 to DC_DIVEMODE_FREEDIVE, everything else (and a stream with no activity chunk, since the Nautic/Ocean are recreational OC computers) to DC_DIVEMODE_OC. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> (cherry picked from commit 3319bab08bcc4042aaf7cd0e2d8b8a3bd45f8e86)
Each 18-byte cylinder record in the 0x16 extended-status chunk carries a uint32 LE (seconds) at +10 -- the gas time remaining, the app's Cylinders[].GasTime. 0xFFFFFFFF means not computed (no AI, or not enough data yet). Emit it for the primary cylinder as RBT minutes, the same way suunto_eonsteel does. Byte-exact against the app export's per-sample GasTime on real pod dives (deepsealabs/libdc-swift#29), and absent exactly on the no-transmitter dives. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Chunk 0x0F is [timeDelta:2][hr:uint8 bpm] -- the Suunto Ocean's optical wrist heart rate, one sample per second. The Nautic and Nautic S have no HR sensor, so the chunk never appears on those and nothing changes for them. Verified byte-exact against the app export's per-sample HR on a real Ocean dive (deepsealabs/libdc-swift#29): 2413 samples, first 30 values identical (89, 89, 89, 90, 89, 91, ...), full range 66-113 bpm. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
- DC_FIELD_TEMPERATURE_SURFACE: the first temperature reading, taken at the surface at dive start. Verified against the app export's first sample on real dives (24.3 / 20.9 / 29.7 C). - DC_SAMPLE_GASMIX: emit the active gas-mix index on a CHUNK_GAS_SWITCH, the modern channel, alongside the existing SAMPLE_EVENT_GASCHANGE that older consumers read. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Brings the shipping branch up to date on main:
DC_EVENT_DEVINFO(firmware + serial) for the Nautic (libdc-swift #40)DC_SAMPLE_RBTDC_SAMPLE_HEARTBEATAll verified against the real-capture corpus (libdc-swift #29).