Using a custom object, when returning both values 0 the message is not received, and an error file is created, specified below

SendReceiveOptions nullCompressionSRO = new SendReceiveOptions(DPSManager.GetDataSerializer<ProtobufSerializer>(),null,null);
NetworkComms.DefaultSendReceiveOptions = nullCompressionSRO;

NetworkComms.AppendGlobalIncomingPacketHandler<PingRequestDC>( “pingRequest” ), PingRequestReturn );

using ProtoBuf;
[ProtoContract]
public class PingRequestDC
{
[ProtoMember(1)]
public short ClientID { get; set; }
[ProtoMember(2)]
public byte PingID { get; set; }
}

private void PingRequestReturn( PacketHeader header, Connection connection, PingRequestDC data )
{
lock( objectThreadLock )
{
short idx = data.ClientID;
byte pingidx = data.PingID;
}
}

Base Exception Type: System.NullReferenceException: Object reference not set to an instance of an object
at Server.PingRequestReturn (NetworkCommsDotNet.PacketHeader header, NetworkCommsDotNet.Connection connection, .PingRequestDC data) [0x0000d] in D:\!unityProjects\FPS_SRV\Assets\Scripts\Server.cs:388
at NetworkCommsDotNet.PacketTypeHandlerDelegateWrapper`1[PingRequestDC].Process (NetworkCommsDotNet.PacketHeader packetHeader, NetworkCommsDotNet.Connection connection, System.Object obj) [0x00000] in <filename unknown>:0
at NetworkCommsDotNet.NetworkComms.TriggerGlobalPacketHandlers (NetworkCommsDotNet.PacketHeader packetHeader, NetworkCommsDotNet.Connection connection, System.IO.MemoryStream incomingDataStream, NetworkCommsDotNet.SendReceiveOptions options, Boolean ignoreUnknownPacketTypeOverride) [0x00000] in <filename unknown>:0

Stack Trace: at Server.PingRequestReturn (NetworkCommsDotNet.PacketHeader header, NetworkCommsDotNet.Connection connection, .PingRequestDC data) [0x0000d] in D:\!unityProjects\FPS_SRV\Assets\Scripts\Server.cs:388
at NetworkCommsDotNet.PacketTypeHandlerDelegateWrapper`1[PingRequestDC].Process (NetworkCommsDotNet.PacketHeader packetHeader, NetworkCommsDotNet.Connection connection, System.Object obj) [0x00000] in <filename unknown>:0
at NetworkCommsDotNet.NetworkComms.TriggerGlobalPacketHandlers (NetworkCommsDotNet.PacketHeader packetHeader, NetworkCommsDotNet.Connection connection, System.IO.MemoryStream incomingDataStream, NetworkCommsDotNet.SendReceiveOptions options, Boolean ignoreUnknownPacketTypeOverride) [0x00000] in <filename unknown>:0