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The player is the unmodified web player in an roHtmlWidget — that already runs
on real hardware. What was missing is everything a page cannot do for itself.
autorun.brs becomes a host rather than a URL wrapper. It owns the widget
lifecycle, because a page-initiated location.reload() does not reliably bring an
roHtmlWidget back: a deploy on 2026-07-28 reloaded every connected player and
the BrightSign was the only one that never returned. The page now posts
{type:"restart"} and the host rebuilds the widget. It also retries load-error
with backoff, falls back to a local page, and runs a heartbeat watchdog that
catches the case load-error never reports — a page that loaded fine and then
wedged on a dead socket or a stalled decoder.
st-bridge.js is the page's half over @brightsign/messageport: registry-backed
identity (localStorage is origin- and quota-bound, the registry is not),
restart-instead-of-reload, heartbeat, and sync-backend reporting. Every method
degrades to a no-op off-platform, so it is safe to load unconditionally.
sync-backend.js decides whose synchronisation a group runs. Ours is
clock-derived and spans any mix of Android, web, Tizen and BrightSign; BrightWall
is frame-accurate and BrightSign-only. auto picks native when every member is a
BrightSign. The refusal that matters: native sync selected for a mixed group
downgrades and says why, because a half-synced group would look perfectly
synchronised on the dashboard while one panel drifted alone.
Dual output via output_mode single|dual|clone — a second widget loads the same
player with &screen=2 so the server can give it its own playlist.
Written against the BrightDeveloper docs; not yet run on hardware. The README
lists what is unimplemented, including the BrightWall runtime API, which that
doc set does not cover.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Uaeo9MvzKoyXuN6ZsbhtkL
234 lines
10 KiB
Plaintext
234 lines
10 KiB
Plaintext
' ScreenTinker — BrightSign player host
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'
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' The ScreenTinker player itself is the ordinary web player (server/player/index.html) running
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' in an roHtmlWidget. This script is the HOST around it, and it exists for the things a page
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' cannot do for itself:
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'
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' 1. OWN THE WIDGET LIFECYCLE. A page that calls location.reload() on a BrightSign does not
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' reliably come back — observed in the field on 2026-07-28, where a ScreenTinker deploy
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' reloaded every connected player and the BrightSign was the only one that never returned.
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' So the page NEVER reloads itself here: it posts {type:"restart"} and this script tears the
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' widget down and builds a new one. That is a restart the OS actually performs.
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' 2. SURVIVE A DEAD SERVER. load-error retries with backoff and falls back to a local page,
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' instead of leaving a white screen until someone power-cycles the box.
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' 3. PERSIST IDENTITY across reboots and content changes, in the registry rather than in
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' localStorage (which is tied to the page's origin and its storage quota).
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' 4. REACH BRIGHTSCRIPT-ONLY CAPABILITIES on the page's behalf — video mode, a second output,
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' and native BrightWall synchronisation — over the messageport bridge.
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'
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' Pair it with st-bridge.js, which is the JavaScript half of the same contract.
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'
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' SD card layout: autorun.brs st-bridge.js offline.html [screentinker.json]
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'=== configuration ==========================================================================
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' Provisioning order: screentinker.json on the card (imaging a batch) > registry (set once at
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' pairing, survives content updates) > the built-in default.
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Function LoadConfig() As Object
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cfg = {
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server_url: "https://screentinker.com"
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device_id: ""
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sync_backend: "auto" ' auto | screentinker | brightsign
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output_mode: "single" ' single | dual | clone
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inspector: false
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}
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' 1) registry
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reg = CreateObject("roRegistrySection", "screentinker")
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if reg.Exists("server_url") then cfg.server_url = reg.Read("server_url")
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if reg.Exists("device_id") then cfg.device_id = reg.Read("device_id")
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if reg.Exists("sync_backend") then cfg.sync_backend = reg.Read("sync_backend")
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if reg.Exists("output_mode") then cfg.output_mode = reg.Read("output_mode")
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' 2) a JSON file on the card wins — that is how a batch gets imaged without touching each box
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ba = CreateObject("roByteArray")
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if ba.ReadFile("SD:/screentinker.json") then
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json = ParseJson(ba.ToAsciiString())
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if json <> invalid then
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if json.server_url <> invalid then cfg.server_url = json.server_url
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if json.device_id <> invalid then cfg.device_id = json.device_id
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if json.sync_backend <> invalid then cfg.sync_backend = json.sync_backend
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if json.output_mode <> invalid then cfg.output_mode = json.output_mode
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if json.inspector <> invalid then cfg.inspector = json.inspector
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end if
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end if
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return cfg
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End Function
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Sub SaveRegistry(key As String, value As String)
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reg = CreateObject("roRegistrySection", "screentinker")
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reg.Write(key, value)
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reg.Flush()
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End Sub
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'=== player URL =============================================================================
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' Identity is carried in the URL so the page knows who it is before it has any storage of its
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' own. serial is the stable hardware id; device_id is what ScreenTinker assigned at pairing.
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Function PlayerUrl(cfg As Object, screen As Integer) As String
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di = CreateObject("roDeviceInfo")
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url = cfg.server_url + "/player?platform=brightsign"
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url = url + "&serial=" + di.GetDeviceUniqueId()
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url = url + "&model=" + di.GetModel()
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url = url + "&sync_backend=" + cfg.sync_backend
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if cfg.device_id <> "" then url = url + "&device_id=" + cfg.device_id
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if screen > 1 then url = url + "&screen=" + Stri(screen).Trim()
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return url
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End Function
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'=== widget construction ====================================================================
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Function MakeWidget(url As String, rect As Object, port As Object, cfg As Object) As Object
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config = {
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url: url
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nodejs_enabled: true ' REQUIRED for require("@brightsign/*")
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javascript_enabled: true
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storage_path: "SD:/"
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storage_quota: 1073741824 ' 1GB — service-worker cache for offline playback
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port: port
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mouse_enabled: false
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}
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if cfg.inspector then config.inspector_server = { port: 2999 }
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w = CreateObject("roHtmlWidget", rect, config)
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return w
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End Function
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Function FullScreenRect() As Object
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vm = CreateObject("roVideoMode")
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return CreateObject("roRectangle", 0, 0, vm.GetResX(), vm.GetResY())
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End Function
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'=== main ===================================================================================
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Sub Main()
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cfg = LoadConfig()
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port = CreateObject("roMessagePort")
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' Second output. XC2055/XC4055 and XT245/XT1145/XT2145 expose more than one HDMI connector;
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' every other model is single-output and must fall through to it. GetResX/GetResY only ever
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' describe output 1, so a second widget is created ONLY when the config asks for it — an
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' unsupported model then keeps working as a normal single-screen player rather than failing
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' to start. Screen 2 loads the SAME player with &screen=2, so the server can hand it its own
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' playlist ("dual" = independent) or the same one ("clone").
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dual = (cfg.output_mode = "dual" or cfg.output_mode = "clone")
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rect = FullScreenRect()
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widget = MakeWidget(PlayerUrl(cfg, 1), rect, port, cfg)
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widget.Show()
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widget2 = invalid
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if dual then
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screen2 = 2
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if cfg.output_mode = "clone" then screen2 = 1
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widget2 = MakeWidget(PlayerUrl(cfg, screen2), rect, port, cfg)
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if widget2 <> invalid then widget2.Show()
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end if
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retries = 0
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lastBeat = CreateObject("roTimespan")
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lastBeat.Mark()
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' A watchdog on TOP of load-error: a page can load fine and then wedge (dead socket, JS
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' exception, decoder stall) without the OS ever reporting an error. st-bridge.js posts a
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' heartbeat every 30s; three missed beats and we rebuild the widget. This is the difference
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' between a panel that recovers on its own and one that needs a site visit.
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WATCHDOG_MS = 120000
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while true
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msg = wait(5000, port)
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if type(msg) = "roHtmlWidgetEvent" then
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data = msg.GetData()
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if data.reason = "load-finished" then
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retries = 0
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lastBeat.Mark()
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print "[st] player loaded"
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else if data.reason = "load-error" then
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' Back off, then fall back to the local page so the screen says something
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' truthful instead of showing white. The local page keeps retrying the server.
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retries = retries + 1
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print "[st] load-error ("; retries; "): "; data.url
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sleep(ChooseBackoff(retries))
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if retries >= 3 then
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widget = RebuildWidget(widget, "file:///offline.html", rect, port, cfg)
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else
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widget = RebuildWidget(widget, PlayerUrl(cfg, 1), rect, port, cfg)
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end if
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else if data.reason = "message" then
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m = data.message
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lastBeat.Mark()
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if m.type = "heartbeat" then
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' nothing to do — marking the timespan above IS the handling
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else if m.type = "restart" then
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' The page asks to be restarted (deploy, version change, unrecoverable
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' error). NEVER let the page do this with location.reload().
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print "[st] restart requested: "; m.reason
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widget = RebuildWidget(widget, PlayerUrl(cfg, 1), rect, port, cfg)
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else if m.type = "identity" then
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' Pairing completed in the page — persist it where a reboot can find it.
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if m.device_id <> invalid then
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SaveRegistry("device_id", m.device_id)
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cfg.device_id = m.device_id
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end if
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if m.server_url <> invalid then
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SaveRegistry("server_url", m.server_url)
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cfg.server_url = m.server_url
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end if
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else if m.type = "set-video-mode" then
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vm = CreateObject("roVideoMode")
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if m.mode <> invalid then vm.SetMode(m.mode)
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else if m.type = "set-sync-backend" then
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' The server decided which protocol this deployment uses (see
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' server/lib/sync-backend.js). Persist it so a cold boot with no network
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' still starts in the right mode.
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if m.backend <> invalid then
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SaveRegistry("sync_backend", m.backend)
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cfg.sync_backend = m.backend
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end if
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else if m.type = "reboot" then
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print "[st] reboot requested"
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RebootSystem()
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end if
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end if
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end if
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' watchdog
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if lastBeat.TotalMilliseconds() > WATCHDOG_MS then
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print "[st] watchdog: no heartbeat in "; WATCHDOG_MS; "ms — rebuilding widget"
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widget = RebuildWidget(widget, PlayerUrl(cfg, 1), rect, port, cfg)
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lastBeat.Mark()
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end if
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end while
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End Sub
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Function ChooseBackoff(retries As Integer) As Integer
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if retries <= 1 then return 5000
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if retries = 2 then return 15000
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if retries = 3 then return 30000
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return 60000
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End Function
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' Tear the old widget down explicitly before building the new one. Dropping the reference alone
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' leaves the old widget composited and holding its decoder until GC gets to it, which shows up
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' as two players fighting over the screen.
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Function RebuildWidget(old As Object, url As String, rect As Object, port As Object, cfg As Object) As Object
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if old <> invalid then
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old.Hide()
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old = invalid
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end if
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w = MakeWidget(url, rect, port, cfg)
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w.Show()
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return w
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End Function
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