Add support for message 14, Safety Related Broadcast

src/AisParser/AisMessageFactory.cs

@@ -35,7 +35,8 @@ public AisMessage Create(Payload payload)
                     return new AddressedSafetyRelatedMessage(payload);
                 case AisMessageType.SafetyRelatedAcknowledgement:
                     return new SafetyRelatedAcknowledgementMessage(payload);
-                //case AisMessageType.SafetyRelatedBroadcastMessage:
+                case AisMessageType.SafetyRelatedBroadcastMessage:
+                    return new SafetyRelatedBroadcastMessage(payload);
                 case AisMessageType.Interrogation:
                     return new InterrogationMessage(payload);
                 //case AisMessageType.AssignmentModeCommand:

src/AisParser/Messages/SafetyRelatedBroadcastMessage.cs

@@ -0,0 +1,21 @@
+namespace AisParser.Messages
+{
+    public class SafetyRelatedBroadcastMessage : AisMessage
+    {
+        public uint Spare { get; set; }
+
+        public string SafetyRelatedText { get; set; }
+
+        public SafetyRelatedBroadcastMessage()
+            : base(AisMessageType.SafetyRelatedBroadcastMessage)
+        {
+        }
+
+        public SafetyRelatedBroadcastMessage(Payload payload)
+            : base(AisMessageType.SafetyRelatedBroadcastMessage, payload)
+        {
+            Spare = payload.ReadUInt(38, 2);
+            SafetyRelatedText = payload.ReadString(40, 968);
+        }
+    }
+}

test/AisParserTests/MessagesTests/SafetyRelatedBroadcastMessageTests.cs

@@ -0,0 +1,25 @@
+using AisParser;
+using AisParser.Messages;
+using Shouldly;
+using Xunit;
+
+namespace AisParserTests.MessagesTests
+{
+
+    public class SafetyRelatedBroadcastMessageTests : MessageTestBase
+    {
+        [Fact]
+        public void Should_parse_message()
+        {
+            const string sentence = "!AIVDM,1,1,,A,>>QK2khE0U8:1@E=@0,4*52"; // EPIRB test message
+
+            var message = Parser.Parse(sentence) as SafetyRelatedBroadcastMessage;
+            message.ShouldNotBeNull();
+            message.MessageType.ShouldBe(AisMessageType.SafetyRelatedBroadcastMessage);
+            message.Repeat.ShouldBe(0u);
+            message.Mmsi.ShouldBe(974570191u);
+            message.Spare.ShouldBe(0u);
+            message.SafetyRelatedText.ShouldBe("EPIRB TEST");
+        }
+    }
+}