Alan-Jowett / sonde / 25926387606
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spec: BPF decoder programs and sensor data pipeline (#923)

* spec: add decoder BPF programs and sensor data pipeline

Add specifications for BPF decoder programs (GW-1900-1906,
AZH-0500-0502, WEB-0700-0702). A single ELF file contains two
sections: SEC("sonde") for node program and optional SEC("decoder")
for gateway-side data decoding.

The gateway executes the decoder on incoming APP_DATA to enrich
CBOR messages with a readings map (key 16) before forwarding to
handlers and the connector. The Azure handler stores enriched data
in a SensorData table. The SPA gains a Sensor Data tab with
time-series visualization.

13 new requirements, 24 new test cases, 10 docs updated.

Signed-off-by: alanjo <alanjo@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* spec: address PR review feedback

- Fix section references from non-existent 9.2a to 9.2
- Fix decoder context pointer width to uint64_t (16 bytes, 8-byte
  aligned) matching existing BPF verifier convention
- Specify lowercase hex encoding for SensorData PartitionKey
- Fix map_update_elem signature (no flags arg in sonde convention)
- Fix emit_reading return values in helper table (0/-1/-2)
- Clarify program_hash covers node image only (not decoder)
- Fix SensorData table name casing in SPA architecture diagram
- Specify int64 JSON encoding strategy for values beyond
  Number.MAX_SAFE_INTEGER

Signed-off-by: alanjo <alanjo@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* spec: address second-round PR review feedback

- Align int64 JSON encoding rule: normative AC in AZH-0501 (AC-5),
  web-ui-design references it as consumer expectation
- Fix PartitionKey formula in validation to include UTF-8 bytes detail
- Clarify DecoderPlatform section name is exact match, not prefix
- Fix decoder_context struct in requirements to match uint64_t/16-byte
  layout from bpf-environment.md and gateway-design.md
- Fix T-WEB-0705 traceability from W... (continued)

34276 of 41283 relevant lines covered (83.03%)

194.39 hits per line

Coverage Regressions

Lines Coverage ∆ File
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ID Job ID Ran Files Coverage
1 25926387606.1 124
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Source Files on build 25926387606