Fixed LE decimals to hex checker on rfid

Author: CJBuchel

client/lib/views/kiosk/kiosk_scan_handler.dart

@@ -113,11 +113,13 @@ Future<void> handleKioskScan({
 ///   - 89:02:9e:40        (colon-separated, lowercase)
 ///   - 89 02 9e 40        (space-separated)
 ///   - 89029e40           (no separator)
-///   - decimal BE string  (e.g. "2299477568")
-///   - decimal LE string  (e.g. "1075381897")
+///   - decimal BE string  (e.g. "2298650176")
+///   - decimal LE string  (e.g. "1084097161")
 ///
-/// If a user stored a decimal value in their alias, we also parse it
-/// to hex and generate the hex variants from that.
+/// From a decimal input like "1084097161" (keyboard RFID reader) we produce:
+///   - BE hex: 40:9e:02:89  (direct byte conversion)
+///   - LE hex: 89:02:9e:40  (reversed — matches PCSC format)
+///   - plus space-separated and no-separator variants of both
 Set<String> _buildUidVariants(String input) {
   final variants = <String>{};
   final normalized = input.trim().toLowerCase();
@@ -150,17 +152,28 @@ Set<String> _buildUidVariants(String input) {
   }
 
   // If input looks like a plain decimal number, parse it to hex bytes
-  // and add those variants too (in case user stored hex but card gave decimal)
+  // and add those variants too (in case user stored hex but card gave decimal).
+  // We generate both BE and LE byte orders because keyboard RFID readers
+  // typically output the LE decimal of the UID bytes.
   final asInt = BigInt.tryParse(normalized);
   if (asInt != null && asInt > BigInt.zero) {
     final bytes = _bigIntToBytes(asInt);
     if (bytes.isNotEmpty) {
-      final hexParts = bytes
+      // Big-endian interpretation
+      final hexBe = bytes
           .map((b) => b.toRadixString(16).padLeft(2, '0'))
           .toList();
-      variants.add(hexParts.join(':'));
-      variants.add(hexParts.join(' '));
-      variants.add(hexParts.join());
+      variants.add(hexBe.join(':'));
+      variants.add(hexBe.join(' '));
+      variants.add(hexBe.join());
+
+      // Little-endian (reversed) interpretation
+      final hexLe = bytes.reversed
+          .map((b) => b.toRadixString(16).padLeft(2, '0'))
+          .toList();
+      variants.add(hexLe.join(':'));
+      variants.add(hexLe.join(' '));
+      variants.add(hexLe.join());
     }
   }
 

client/lib/widgets/rfid_scan_button.dart

@@ -16,11 +16,24 @@ class RfidScanButton extends HookWidget {
   Widget build(BuildContext context) {
     final listening = useState(false);
     final timerRef = useRef<Timer?>(null);
+    final mounted = useRef(true);
+
+    // Cancel the timer on dispose to prevent writing to a disposed notifier
+    useEffect(() {
+      mounted.value = true;
+      return () {
+        mounted.value = false;
+        timerRef.value?.cancel();
+        timerRef.value = null;
+      };
+    }, const []);
 
     void stopListening() {
       timerRef.value?.cancel();
       timerRef.value = null;
-      listening.value = false;
+      if (mounted.value) {
+        listening.value = false;
+      }
     }
 
     useRfidScanner(
@@ -47,10 +60,7 @@ class RfidScanButton extends HookWidget {
     return OutlinedButton.icon(
       onPressed: () {
         listening.value = true;
-        timerRef.value = Timer(_timeoutDuration, () {
-          listening.value = false;
-          timerRef.value = null;
-        });
+        timerRef.value = Timer(_timeoutDuration, stopListening);
       },
       icon: const Icon(Icons.contactless),
       label: const Text('Scan RFID Card'),