Add search duration check for exceeding 15 minutes (#10293)

* Add search duration check for exceeding 15 minutes

Added a condition to check if the search duration exceeds 15 minutes, indicating too long of a search.

* trunk

* Fix searchedTooLong: move 15-min cap before UINT32_MAX check, cache elapsed, add constexpr

Agent-Logs-Url: https://github.com/meshtastic/firmware/sessions/b7f74430-9e7e-4a6f-8095-6176c1eee972

Co-authored-by: thebentern <9000580+thebentern@users.noreply.github.com>

* Update src/gps/GPSUpdateScheduling.cpp

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Remove dead UINT32_MAX branch from searchedTooLong

Agent-Logs-Url: https://github.com/meshtastic/firmware/sessions/6dad5b56-902e-4d0e-90c1-038a9c2df364

Co-authored-by: thebentern <9000580+thebentern@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: thebentern <9000580+thebentern@users.noreply.github.com>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: 4 people

src/gps/GPSUpdateScheduling.cpp

@@ -70,20 +70,25 @@ bool GPSUpdateScheduling::isUpdateDue()
 // Have we been searching for a GPS position for too long?
 bool GPSUpdateScheduling::searchedTooLong()
 {
+    constexpr uint32_t oneMinuteMs = 60UL * 1000UL;
+    constexpr uint32_t maxSearchClampMs = 15UL * oneMinuteMs; // Hard cap: 15 minutes is always too long
+    uint32_t elapsed = elapsedSearchMs();
+
+    // Anything over 15 minutes is too long, regardless of the broadcast interval.
+    // TODO: Make a smarter algorithm that backs off the search dwell time when not getting a lock.
+    if (elapsed > maxSearchClampMs)
+        return true;
+
     uint32_t minimumOrConfiguredSecs =
         Default::getConfiguredOrMinimumValue(config.position.position_broadcast_secs, default_broadcast_interval_secs);
     uint32_t maxSearchMs = Default::getConfiguredOrDefaultMs(minimumOrConfiguredSecs, default_broadcast_interval_secs);
-    // If broadcast interval set to max, no such thing as "too long"
-    if (maxSearchMs == UINT32_MAX)
-        return false;
 
     // If we've been searching longer than our position broadcast interval: that's too long
-    else if (elapsedSearchMs() > maxSearchMs)
+    if (elapsed > maxSearchMs)
         return true;
 
     // Otherwise, not too long yet!
-    else
-        return false;
+    return false;
 }
 
 // Updates the predicted time-to-get-lock, by exponentially smoothing the latest observation