Reduce blocking BMS connection timeout

firmware/esp32/overland-controller/bms.cpp

@@ -21,7 +21,7 @@ static bool responseReady = false;
 static unsigned long lastReadAttempt = 0;
 
 static unsigned long lastBmsConnectAttempt = 0;
-static unsigned long bmsConnectBackoffMs = 30000;
+static unsigned long bmsConnectBackoffMs = 120000;
 static int bmsConnectFailCount = 0;
 static unsigned long bmsReconnectPausedUntil = 0;
 static bool bmsSetupMode = false;
@@ -317,6 +317,9 @@ static bool connectBms() {
 
     client = NimBLEDevice::createClient();
 
+    // Keep failed/out-of-range BMS attempts from freezing the web UI too long.
+    client->setConnectTimeout(3);
+
     if (!client->connect(address)) {
         Serial.println("BMS: Connect failed");
         bmsData.connected = false;
@@ -536,16 +539,16 @@ void updateBms() {
             bmsConnectFailCount++;
 
             if (bmsConnectFailCount >= 3) {
-                bmsConnectBackoffMs = 60000;
+                bmsConnectBackoffMs = 120000;
             } else {
-                bmsConnectBackoffMs = 30000;
+                bmsConnectBackoffMs = 60000;
             }
 
             return;
         }
 
         bmsConnectFailCount = 0;
-        bmsConnectBackoffMs = 30000;
+        bmsConnectBackoffMs = 60000;
     }
 
     if (requestPacket(JBD_STATUS_REQUEST, sizeof(JBD_STATUS_REQUEST))) {