[GreenGrassBlueOcean]

Rebuilt on v2-phase1-architecture after #765. The strict-typing half of the earlier version of this PR (installing OWNd in strict-typing.yml, dropping the OWNd.* mypy override, the 11 boundary fixes) landed in #765 against the PyPI OWNd==2.0.0b11 pin, and the tests/test_connection.py patch targets landed in #758. The OWNd pin stays at OWNd==2.0.0b11. What remains is the websession injection and the licence fix.

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1. What is the problem?

1. OWNd discovery opens its own HTTP sessions (custom_components/myhome/config_flow.py, quality_scale.yaml):
   • OWNd.discovery.find_gateways() and get_gateway() fetch the gateway's UPnP/SOAP description XML over HTTP (SSDP LOCATION, port 49153 on most gateways). Both accept session: aiohttp.ClientSession | None = None.
   • MyhomeFlowHandler.async_step_user and async_step_custom called them without a session, so OWNd created and closed a private ClientSession on every discovery, outside Home Assistant's managed connection pool.
   • quality_scale.yaml marked inject-websession as exempt ("No HTTP is used"), which is not true for discovery.
2. Wrong licence for OWNd (quality_scale.yaml):
   • dependency-transparency described OWNd as "MIT/GPL licensed". OWNd is Apache-2.0 (its LICENSE and the license = "Apache-2.0" metadata on the 2.0.0b11 PyPI release).

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2. How is it solved?

1. Inject the Home Assistant websession (config_flow.py):
   • find_gateways(session=async_get_clientsession(self.hass)) in async_step_user.
   • get_gateway(user_input["address"], session=async_get_clientsession(self.hass)) in async_step_custom.
   • The optional UPnP lookup in async_step_custom still falls back to manual MAC entry on any failure, but no longer silently. The redundant except (asyncio.TimeoutError, Exception) becomes except Exception as err, which logs UPnP lookup of <address> failed, asking for the MAC: <err> at debug level. The clause itself dates from 2020 (ce7a342d); it stays broad on purpose, because a timeout, an HTTP error or malformed XML must all lead to the manual step rather than a broken config flow.
2. Quality scale (quality_scale.yaml, docs/quality_scale_plan.md):
   • inject-websession: exempt → done, with a comment that names the two calls and says the bus itself stays on raw TCP.
   • dependency-transparency: "MIT/GPL" → "Apache-2.0".
   • The Platinum note in docs/quality_scale_plan.md now matches. The stale "504 errors remain in 13 modules" line is replaced with the actual state: all 71 modules clean, and mypy_baseline.json at "total": 0.
3. Tests (tests/test_config_flow.py):
   • test_config_flow_injects_ha_websession_into_discovery runs the user step and then the custom step, and asserts that both find_gateways and get_gateway are awaited with session=async_get_clientsession(hass). Both are patched with an explicit new_callable=AsyncMock.
   • test_custom_step_validation_and_timeout also asserts the new debug line for a get_gateway timeout.

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3. State Diagram

sequenceDiagram
    participant User as Home Assistant User
    participant CF as MyhomeFlowHandler (config_flow.py)
    participant HAHttp as async_get_clientsession(hass)
    participant OWNd as OWNd.discovery (find_gateways / get_gateway)
    participant GW as MyHOME Gateway (UPnP / SOAP XML)

    User->>CF: Start config flow (step_user / step_custom)
    CF->>HAHttp: async_get_clientsession(self.hass)
    HAHttp-->>CF: Shared aiohttp.ClientSession
    CF->>OWNd: find_gateways(session=…) / get_gateway(addr, session=…)
    OWNd->>GW: HTTP GET UPnP description XML (shared HA session)
    GW-->>OWNd: Device / service XML (model, serial, port)
    OWNd-->>CF: Discovered gateway metadata

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4. Where are the traces (real ones)?

• tests/fixtures/traces/oracle_h4684_gateway/myhome_trace_oracle_h4684_gateway_identification.json: gateway discovery and identification metadata.
• Only the HTTP client used for discovery changes. The discovered metadata and the OpenWebNet bus traffic are the same, so no new bus trace applies.

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5. What does the Firmware Oracle / Encyclopedia say?

• Gateways with a UPnP/SSDP responder (F454, F455, MH202, MH201, F452, F453AV on port 49153; MyHomeServer1, MH200N, MH200, H4890, HL4684 via SSDP) serve their description XML over HTTP during find_gateways() / get_gateway(). This is the traffic that now uses Home Assistant's session.
• Gateways without UPnP (F461 020011, Legrand 3578) skip HTTP discovery and identify in-band via WHO 13 (*#13**15##) and WHO 1013 (*#1013*0*1##) over the OpenWebNet session, which this PR does not touch.

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Verification

• Full suite on v2-phase1-architecture at 3692dd11 (fix(typing): check mypy --strict against the pinned OWNd 2.0.0b11 types #765 merged) against the released OWNd==2.0.0b11 wheel with --cov=custom_components/myhome: 4359 passed, 5 snapshots passed, TOTAL 14461 statements, 0 missed, 100.0%.

• scripts/typing_ratchet.py with OWNd b11 installed: 0 error(s) in 0 module(s); baseline 0.

• ruff check custom_components tests scripts, scripts/verify_ha_standards.py, scripts/sync_documentation.py --check: all pass. scripts/quality_scale_report.py lists inject-websession as ✅ done.

• V2 Architecture: New entities implement handle_event() and do not manually subscribe via async_dispatcher_connect. (No entities are added or changed.)

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