Allow pairing on all platforms

Mark Web/Linux as not supporting in-app pairing

lib/src/models/ble_capabilities.dart

@@ -2,12 +2,20 @@ import 'package:flutter/foundation.dart';
 
 class BleCapabilities {
   /// Returns true if pairing is possible either by API or by encrypted characteristic.
-  /// All platforms support this except Windows/Web.
+  /// 
+  /// All platforms support this except Web/Windows and Web/Linux.
+  /// 
+  /// On `Web/Windows` and `Web/Linux` it is known to only work for devices that require passkey pairing.
+  /// If your device requires passkey pairing you can consider this true for all platforms.
+  /// 
+  /// `Web/Linux` could under certain circumstances present a pairing dialog also for devices that do
+  /// not use passkey pairing but it very unreliable so we consider it unsupported.
   static final bool supportsInAppPairing =
       _triggersPairingWithEncryptedChar || hasSystemPairingApi;
 
   static final _triggersPairingWithEncryptedChar =
-      defaultTargetPlatform != TargetPlatform.windows;
+      defaultTargetPlatform != TargetPlatform.windows ||
+          defaultTargetPlatform != TargetPlatform.linux;
 
   static bool hasSystemPairingApi = !kIsWeb &&
       (defaultTargetPlatform == TargetPlatform.android ||

lib/src/universal_ble.dart

@@ -232,14 +232,11 @@ class UniversalBle {
   /// You can optionally pass a pairingCommand if you know an encrypted read or write characteristic.
   /// If you do, it returns true if it can successfully execute the command after pairing.
   ///
-  /// Throws UnsupportedError on `Web/Windows`
+  /// On `Web/Windows` and `Web/Linux` it is known to work only for devices that require passkey pairing.
   static Future<bool?> pair(
     String deviceId, {
     BleCommand? pairingCommand,
   }) async {
-    if (!BleCapabilities.supportsInAppPairing) {
-      throw UnsupportedError("Not supported");
-    }
     if (BleCapabilities.hasSystemPairingApi) {
       return _platform.pair(deviceId);
     }