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Hold screen wake-lock during GPS capture (firmware-todo #1)

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Phone screen-sleep suspends the dashboard page and stops geolocation — the main
cause of detections logged without coords while walking. Add Screen Wake Lock API:
acquire on GPS start, re-acquire on visibilitychange when the page returns to
foreground. Keeps watchPosition alive with the screen on.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
rpriven 2026-06-22 12:59:04 -06:00
parent 967d0db853
commit 2685a6d71b
Signed by: djedi
GPG key ID: D04DED574622EF45
1 changed files with 7 additions and 1 deletions
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8
src/main.cpp
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@ -1520,6 +1520,12 @@ h+='<div class="pg"><h3>Raven UUIDs ('+p.raven.length+')</h3><div class="it">'+p
document.getElementById('pC').innerHTML=h;window._pL=1;}).catch(()=>{});}
// === GPS ===
let _gW=null,_gOk=false,_gTried=false;
// Screen Wake Lock — keep the screen on during GPS capture. Phone screen-sleep suspends the
// page and stops geolocation (the #1 cause of GPS-less detections while walking). Re-acquire
// when the page returns to the foreground. Needs a secure context (same flag GPS already needs).
let _wl=null;
async function acquireWake(){try{if('wakeLock' in navigator){_wl=await navigator.wakeLock.request('screen');_wl.addEventListener('release',function(){_wl=null;});}}catch(e){}}
document.addEventListener('visibilitychange',function(){if(document.visibilityState==='visible'&&_gW!==null&&_wl===null){acquireWake();}});
function sendGPS(p){_gOk=true;let g=document.getElementById('sG');g.textContent='OK';g.style.color='#22c55e';
fetch('/api/gps?lat='+p.coords.latitude+'&lon='+p.coords.longitude+'&acc='+(p.coords.accuracy||0)).catch(()=>{});}
function gpsErr(e){_gOk=false;let g=document.getElementById('sG');
@ -1530,7 +1536,7 @@ g.textContent=msg;}
function startGPS(){if(!navigator.geolocation){return false;}
if(_gW!==null){navigator.geolocation.clearWatch(_gW);_gW=null;}
let g=document.getElementById('sG');g.textContent='...';g.style.color='#facc15';
_gW=navigator.geolocation.watchPosition(sendGPS,gpsErr,{enableHighAccuracy:true,maximumAge:5000,timeout:15000});return true;}
_gW=navigator.geolocation.watchPosition(sendGPS,gpsErr,{enableHighAccuracy:true,maximumAge:5000,timeout:15000});acquireWake();return true;}
function reqGPS(){if(!navigator.geolocation){alert('GPS not available in this browser.');return;}
if(_gOk){return;}
if(!window.isSecureContext){alert('GPS requires a secure context (HTTPS). This HTTP page may not get GPS permission.\\n\\nAndroid Chrome: try chrome://flags and enable "Insecure origins treated as secure", add http://192.168.4.1\\n\\niPhone: GPS will not work over HTTP.');}