LEGACY protocol TVs (Hisense OLED B5) fail to set up — MQTT code 5 (upstream vidaa-control bug)

[duduroga]

Environment

• TV: Hisense OLED B5
• TV firmware: V0000.01.00L.L1021
• TV protocol version: 2150 (LEGACY)
• ha-vidaa-tv version: latest (HACS)
• Home Assistant version: [fill in yours]
• vidaa-control version: 1.1.0

Symptom

Integration setup fails with MQTT code 5 (not authorized). TV is reachable on the
network but pairing never completes.

Root cause

Bug in the upstream vidaa-control library (v1.1.0). LEGACY protocol TVs require
static MQTT credentials (hisenseservice / multimqttservice) but the client
generates dynamic credentials instead. Neither the main connection path nor the
fallback path ever tries static credentials for LEGACY TVs.

Upstream issue filed: [paste the link to the vidaa-control issue you just filed]

Fix

Requires a patch to vidaa-control. Tracked upstream at the link above. Once
vidaa-control releases a fixed version, this integration should work without
any changes on its end.

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Additional finding: LEGACY protocol TVs (protocol version 2150) also do not support
PIN-based pairing. The config flow in ha-vidaa-tv unconditionally calls
async_start_pairing() and shows a PIN entry form, but LEGACY TVs ignore the pairing
request entirely and never display a PIN.

Fix: detect LEGACY protocol after async_connect() and skip the pairing step entirely —
create the config entry directly using the static credentials that were already
established during connection.