Issue 568

lib/src/messages/publish/mqtt_client_mqtt_publish_payload.dart

@@ -67,8 +67,6 @@ class MqttPublishPayload extends MqttPayload {
 
   /// Converts an array of bytes to a character string.
   static String bytesToStringAsString(typed.Uint8Buffer message) {
-    final sb = StringBuffer();
-    message.forEach(sb.writeCharCode);
-    return sb.toString();
+    return utf8.decode(message.toList());
   }
 }

test/mqtt_client_base_test.dart

@@ -997,4 +997,22 @@ void main() {
           isTrue);
     });
   });
+  group('Conversions', () {
+    group('Bytes To String as String', () {
+      test('String 1', () {
+        final original = 'Hello, 世界!';
+        final buffer = typed.Uint8Buffer();
+        buffer.addAll(utf8.encode(original)); // Encode the string to bytes
+        final decoded = MqttPublishPayload.bytesToStringAsString(buffer);
+        expect(decoded == original, isTrue);
+      });
+      test('String 2', () {
+        final original = 'Seu próximo agendamento iniciará em 5 minutos.';
+        final buffer = typed.Uint8Buffer();
+        buffer.addAll(utf8.encode(original)); // Encode the string to bytes
+        final decoded = MqttPublishPayload.bytesToStringAsString(buffer);
+        expect(decoded == original, isTrue);
+      });
+    });
+  });
 }