Receive advertisement events on web (#63)

* Fix web manufacturer discovery

* Minor Fixes

* Cleanups

* Add canWatchAdvertisements api

* Improve Cleanups

* Improve code level documentation

* Improve documentation

---------

Co-authored-by: Foti Dim <fdimanidis@gmail.com>

example/lib/home/home.dart

@@ -1,5 +1,7 @@
 // ignore_for_file: use_build_context_synchronously
 
+import 'dart:developer';
+
 import 'package:flutter/material.dart';
 import 'package:universal_ble/universal_ble.dart';
 import 'package:universal_ble_example/data/capabilities.dart';
@@ -50,8 +52,7 @@ class _MyAppState extends State<MyApp> {
     };
 
     UniversalBle.onScanResult = (result) {
-      // debugPrint("BleDevice: ${result.name}  ${result.services}");
-      // debugPrint("${result.name} ${result.manufacturerData}");
+      log(result.toString());
       int index = _bleDevices.indexWhere((e) => e.deviceId == result.deviceId);
       if (index == -1) {
         _bleDevices.add(result);

example/lib/home/widgets/scan_filter_widget.dart

@@ -74,6 +74,7 @@ class _ScanFilterWidgetState extends State<ScanFilterWidget> {
           ScanFilter(
             withServices: serviceUUids,
             withNamePrefix: namePrefixes,
+            withManufacturerData: manufacturerDataFilters,
           ),
         );
         ScaffoldMessenger.of(context).showSnackBar(

example/lib/peripheral_details/peripheral_detail_page.dart

@@ -93,16 +93,20 @@ class _PeripheralDetailPageState extends State<PeripheralDetailPage> {
   }
 
   Future<void> _discoverServices() async {
-    var services = await UniversalBle.discoverServices(widget.deviceId);
-    print('${services.length} services discovered');
-    discoveredServices.clear();
-    setState(() {
-      discoveredServices = services;
-    });
+    try {
+      var services = await UniversalBle.discoverServices(widget.deviceId);
+      print('${services.length} services discovered');
+      discoveredServices.clear();
+      setState(() {
+        discoveredServices = services;
+      });
 
-    if (kIsWeb) {
-      _addLog("DiscoverServices",
-          '${services.length} services discovered,\nNote: Only services added in ScanFilter will be discovered');
+      if (kIsWeb) {
+        _addLog("DiscoverServices",
+            '${services.length} services discovered,\nNote: Only services added in ScanFilter will be discovered');
+      }
+    } catch (e) {
+      _addLog("DiscoverServicesError", e);
     }
   }