Mortdecai
49 lines
2.9 KiB
Markdown
49 lines
2.9 KiB
Markdown
# LG TV Bridge — Decisions
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Format: `YYYY-MM-DD: <decision> — <why>`
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- **2026-06-01: Single bridge, single host — runs on steel141, pve173 retired.**
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The bridge had been running on pve173 (always-on node) since 2026-03-23,
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SSHing to steel141 for every TV op. Consolidated everything onto steel141.
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*Why:* the WebOS pairing key (`/home/seth/.aiopylgtv.sqlite`) lives only on
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steel141, so `power_off` always routes through it regardless of bridge host —
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pve173 added an SSH hop and a second host for no real availability gain (the
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TV is uncontrollable whenever steel141 is down anyway). One host, no SSH hop.
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- **2026-06-01: Cached-IP discovery, sweep only on miss.** Persist last-known TV
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IP in `~/.cache/lgtv/last_ip`; probe it directly (TCP :3000/:3001). Full /24
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ping-sweep runs only on a cache miss, then re-caches. *Why:* the old code
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ping-swept all 254 hosts over SSH on every 30s HA state poll — slow, network
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spam, and racy (stale ARP) → the chronic "flaky state in HA" symptom.
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- **2026-06-01: Robust WoL — unicast + broadcast, ports 9/7, 3 bursts.** *Why:*
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old code sent broadcast-only on ports 9/1235 once. Unreliable wakes. NOTE: the
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remaining wake failures are TV-side (Quick Start+ / Mobile TV On must be ON;
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wired Ethernet far more reliable than Wi-Fi for LG WoL) — not fixable in code.
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- **2026-06-01: Deps via `pip --user --break-system-packages` for `seth`.** paho
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+ bscpylgtv live in `/home/seth/.local` (PEP 668 box). Matches how bscpylgtv
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was already installed; the systemd unit runs `User=seth`.
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- **2026-06-01: power_off must pass an absolute `key_file_path`.** bscpylgtv's
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`StorageSqliteDict` defaults the key DB to `os.getcwd()/.aiopylgtv.sqlite`
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(its `$USER_HOME` fallback is not `$HOME`). The old pve173 setup worked only
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because it SSHed in as seth, landing CWD in `/home/seth`. Under systemd
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(cwd=/) it threw `sqlite3.OperationalError: unable to open database file`.
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Fix: `WebOsClient.create(ip, key_file_path="~/.aiopylgtv.sqlite")`.
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- **2026-06-01: power_off retries (2×, 10s apart).** A TV woken seconds earlier
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answers TCP :3000 but refuses a WebSocket control session for ~20-30s, so an
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immediate OFF-after-ON can fail. Retry covers it; normal case (TV already up)
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succeeds first try in ~3s. Bounded under the bridge's 60s subprocess timeout.
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## Deferred / Rejected
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- **DHCP reservation for the TV (static IP):** not done — Pi-hole doesn't run
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DHCP (router does), so it's Seth's action on the router. The cached-IP probe
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makes it unnecessary for correctness; a reservation would just let us drop the
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sweep-fallback entirely. Add if convenient.
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- **Unique per-instance MQTT client_id:** rejected — keeping a fixed
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`lgtv-bridge` id means a duplicate instance is *loud* (reconnect war in broker
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logs) rather than silent. Single-instance discipline is the real guard. (A
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duplicate on 2026-06-01 during this very migration is what surfaced all this.)
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