polar pmd: ppi stream decode - #45
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Reviewer's GuideAdds a publicly exported, deliberately hardware-agnostic Polar PMD PPI implementation: it generates start/stop control-point commands, parses responses, decodes fixed six-byte PPI records, and tests valid and malformed wire layouts while leaving other PMD streams untouched. Sequence diagram for Polar PMD PPI streamingsequenceDiagram
participant Client
participant ControlPoint
participant Sensor
participant DataCharacteristic
Client->>ControlPoint: polarPmdStartPpi()
Sensor-->>ControlPoint: [0xF0, reqOpcode, measType, status]
Client->>ControlPoint: parsePolarPmdControlResponse(value)
Sensor-->>DataCharacteristic: PPI frame
Client->>DataCharacteristic: parsePolarPmdPpiFrame(value)
DataCharacteristic-->>Client: PolarPpiSample[]
Client->>ControlPoint: polarPmdStopPpi()
Sensor-->>ControlPoint: [0xF0, reqOpcode, measType, status]
Flow diagram for Polar PMD PPI frame decodingflowchart TD
A[PMD data notification] --> B{PPI measurement type?}
B -- No --> X[Return null]
B -- Yes --> C{Valid uncompressed frame?}
C -- No --> X
C -- Yes --> D{Body is whole 6-byte records?}
D -- No --> X
D -- Yes --> E[Decode hr, ppiMs, errorEstimateMs, and flags]
E --> F[Return PolarPpiSample list]
File-Level Changes
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughAdds public Polar PMD PPI support. The module builds start and stop commands, parses control responses, models PPI samples, and decodes validated uncompressed frames. Tests cover valid records, flags, command responses, and malformed input. ChangesPolar PMD PPI support
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This adds public Polar PMD PPI commands and decoding while rejecting unsupported and malformed frames. The current implementation and coverage show no remaining actionable merge risk. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Hey - I've found 1 issue
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Please address the comments from this code review:
## Individual Comments
### Comment 1
<location path="lib/src/polar_pmd.dart" line_range="32" />
<code_context>
+/// `(recording << 7) | measType` with `recording` clear (online streaming, not
+/// on-sensor recording) and no setting blocks — PPI has none to negotiate.
+List<int> polarPmdStartPpi() =>
+ const [kPolarPmdOpRequestMeasurementStart, kPolarPmdMeasTypePpi];
+
+/// The bytes to write to the control point to stop the PPI stream.
</code_context>
<issue_to_address>
**issue (bug_risk):** The start request omits the required online-recording field, so it sends only `[0x02, 0x03]` instead of the PMD start request `[0x02, 0x03, 0x00]`; a Polar sensor rejects the command and never starts the PPI stream. The test cements this incomplete wire command rather than detecting it.
**Triggers:** When `polarPmdStartPpi()` is written to a real Polar PMD control point.
**Suggested fix:** Append the online recording value (`0x00`) to the start command and update the fixture to expect three bytes.
</issue_to_address>Sourcery assessment
Approval pending. 1 finding to address first.
Blocking findings: lib/src/polar_pmd.dart:32
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checked — PMD's start-measurement request is opcode + type only when there are no settings to negotiate (PPI has none); the recording/online distinction isn't a third byte on this command. leaving as-is. |
same never-tested flags byte, same lack of hardware confirmation.
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Actionable comments posted: 1
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Inline comments:
In `@lib/src/polar_pmd.dart`:
- Line 119: Update the PPI frame validation in the relevant decoder to reject
every frame whose type byte at value[9] is nonzero, preserving decoding only for
frame type 0x00. Add a test using frame[9] = 0x01 that verifies the decoder
returns null.
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lib/openstrap_protocol.dartlib/src/polar_pmd.darttest/polar_pmd_test.dart
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PPI defines only frame type 0; any other value (compressed or not) is not a shape this decoder should accept.
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polar verity sense / oh1 speak a shared measurement service (control point + data characteristic). this decodes just the ppi stream — control-point start/stop/response, and the fixed 6-byte ppi record layout. ppg/ecg/accel under the same service are untouched, no settings negotiation needed for ppi.
pairs and banks bytes only, no signal claimed yet — needs real hardware first.
Summary by Sourcery
Add a Polar PMD decoder for online PPI measurements without adding support for the service’s other measurement streams.
New Features:
Enhancements:
Tests:
Summary by CodeRabbit