o2ring: frame envelope + info reply - #49
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wellue o2ring wire format. header/cmd/cmdxor/block/len/data/crc8, same crc8 poly whoop already uses, just over a wider span. verified against a published byte-exact real-hardware request vector. skips the file open/read/close commands on purpose - the only doc for them disagrees with itself on where the reply fields land, and guessing a byte order to drive a read loop is not something this repo does. info command + its json reply (battery/model/serial/file list) only.
Reviewer's GuideIntroduces an experimental, publicly exported O2Ring protocol implementation covering the CRC-protected frame envelope and JSON INFO replies, backed by a hardware-captured request vector and defensive parsing tests; unverified file-transfer and physiological decoding are deliberately excluded. Sequence diagram for O2Ring frame parsing and INFO decodingsequenceDiagram
participant Ring as O2Ring
participant Parser as parseO2RingFrame
participant Info as parseO2RingInfo
Ring->>Parser: Notification bytes
Parser->>Parser: crc8(body)
alt Valid frame
Parser-->>Info: O2RingFrame.data
Info->>Info: jsonDecode(data)
Info-->>Ring: O2RingInfo
else Invalid frame
Parser-->>Ring: null
end
Flow diagram for building an O2Ring command frameflowchart LR
A[Command, block, data] --> B[buildO2RingCommand]
B --> C[Build AA header and length fields]
C --> D["Append crc8(body)"]
D --> E[Complete frame for link.write]
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📝 WalkthroughWalkthroughThe change adds experimental O2Ring frame parsing, command construction, INFO metadata decoding, public library export wiring, and automated tests for valid and invalid inputs. ChangesO2Ring protocol support
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The new O2Ring metadata parser can throw when a device returns unexpectedly typed model or serial fields, potentially disrupting BLE notification handling. Guard these fields and add malformed-field coverage before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@lib/src/o2ring.dart`:
- Around line 143-144: Update parseO2RingInfo to type-guard Model and SN like
the existing CurBAT and FileList handling, returning null for non-string values
instead of casting outside the try block. Extend CurBAT parsing to accept
numeric values as well as the existing string format, and add coverage in the O2
ring tests for non-string Model/SN and numeric battery input.
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lib/openstrap_protocol.dartlib/src/o2ring.darttest/o2ring_test.dart
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an open JSON value cast with 'as String?' throws on a non-string, non-null value instead of falling back to null - breaks this function's own never-throws contract from inside a BLE notification callback. also accept a bare numeric battery, not just a percent string.
kO2RingCmdInfo was only exercised through opcode-agnostic round-trip tests. Add a test on o2ringCmdInfo() itself pinning the byte-exact frame, and note in the header/const doc that 0x14 is independently documented as this ring's INFO opcode, separate from the proven envelope math.
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wellue o2ring (viatom) wire format. header/cmd/cmdxor/block/len/data/crc8 - same crc8 whoop's header already uses, just applied over a wider span. verified byte-exact against a published real-hardware request vector for the read-sensors opcode.
only the frame envelope + the info command (battery/model/serial/file list, plain json) are here. no file open/read/close builders - the only public doc for those disagrees with itself on where the reply fields land, so no read-loop is built on a guess. no physiological decode anywhere in this file, on purpose.
Summary by Sourcery
Add experimental O2Ring frame and device-info protocol support without implementing unverified recording commands or physiological decoding.
New Features:
Enhancements:
Tests:
Summary by CodeRabbit
New Features
Tests