Reset emulated receiver state on a new link session
Bytes from a previous connection combine with a new header after reconnect. Clear session-owned parsing state.
- Focused work estimate
- 1h 45m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Lifecycle · State isolation
Estimated field mix
- Embedded and edge60%
- Networking40%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
Fictional environmental-display devices send synthetic noncritical readings to a local gateway. Implement a byte-stream emulator; no physical device, radio, credentials or safety-critical control is involved.
Setup prerequisites
- Specify a small frame format with length sequence payload and checksum.
- Generate local byte streams with fragmentation corruption and reconnects.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- CFRAME-101 · Decode emulated device frame integers with explicit byte order
- CFRAME-102 · Reject emulated device frames above the receiver limit
- CFRAME-103 · Verify emulated device frame checksums before dispatch
- CFRAME-104 · Assemble fragmented emulated frames across arbitrary read boundaries
- CFRAME-105 · Resynchronize emulated device framing after a corrupt header
- CFRAME-106 · Discard incomplete emulated frames after an idle deadline
- CFRAME-107 · Handle emulated device sequence wrap without accepting stale frames
Acceptance criteria
- New session discards partial buffer
- Sequence window resets by contract
- Completed prior frames remain recorded
Implementation constraints
- Connection identity must not come from payload text alone.
Verification to include
- Reconnect after complete frame
- Reconnect mid-header
Deliverables
- Session reset and reconnect cases
Rollout and recovery
Recreate the receiver per connection until state isolation is repaired.
Value of the work
For the engineer: Practice incremental parsing, fixed resource limits and protocol recovery.
For the team: Inspect whether a device adapter survives malformed input without corrupting accepted readings.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.