Use blocking BLE scan callback timing

firmware/esp32/xterra-controller/bms.cpp

@@ -139,7 +139,7 @@ const BleScanResult* getBleScanResult(int index) {
 int scanBleDevices(uint32_t scanSeconds) {
     Serial.print(logTimestamp());
     Serial.println(" BLE: Starting scan...");
-    pauseBmsReconnect((scanSeconds * 1000UL) + 30000UL);
+    pauseBmsReconnect(60000UL);
 
     if (client && client->isConnected()) {
         Serial.print(logTimestamp());
@@ -162,11 +162,20 @@ int scanBleDevices(uint32_t scanSeconds) {
     scan->clearResults();
 
     Serial.print(logTimestamp());
-    Serial.print(" BLE: Scanning for ");
+    Serial.print(" BLE: Blocking scan requested for ");
     Serial.print(scanSeconds);
     Serial.println(" seconds...");
 
-    bool started = scan->start(scanSeconds, false, false);
+    unsigned long scanStart = millis();
+
+    bool started = scan->start(scanSeconds, false, true);
+
+    unsigned long scanElapsed = (millis() - scanStart) / 1000;
+
+    Serial.print(logTimestamp());
+    Serial.print(" BLE: scan call returned after ");
+    Serial.print(scanElapsed);
+    Serial.println(" seconds");
 
     if (!started) {
         Serial.print(logTimestamp());
@@ -174,28 +183,6 @@ int scanBleDevices(uint32_t scanSeconds) {
         return 0;
     }
 
-    unsigned long startMs = millis();
-    unsigned long durationMs = scanSeconds * 1000UL;
-    unsigned long lastProgressMs = 0;
-
-    while (millis() - startMs < durationMs) {
-        unsigned long elapsed = millis() - startMs;
-
-        if (elapsed - lastProgressMs >= 1000) {
-            lastProgressMs = elapsed;
-
-            Serial.print(logTimestamp());
-            Serial.print(" BLE: scanning... ");
-            Serial.print(elapsed / 1000);
-            Serial.print("/");
-            Serial.print(scanSeconds);
-            Serial.print(" sec, devices ");
-            Serial.println(bleScanResultCount);
-        }
-
-        delay(50);
-    }
-
     scan->stop();
     scan->clearResults();