public ICollection <ArraySegment <byte> > Serialize(MqttBasePacket packet)
{
if (packet == null)
{
throw new ArgumentNullException(nameof(packet));
}
using (var stream = new MemoryStream(128))
using (var writer = new MqttPacketWriter(stream))
{
var fixedHeader = SerializePacket(packet, writer);
var remainingLength = (int)stream.Length;
writer.Write(fixedHeader);
MqttPacketWriter.WriteRemainingLength(remainingLength, writer);
var headerLength = (int)stream.Length - remainingLength;
#if NET461 || NET452 || NETSTANDARD2_0
var buffer = stream.GetBuffer();
#else
var buffer = stream.ToArray();
#endif
return(new List <ArraySegment <byte> >
{
new ArraySegment <byte>(buffer, remainingLength, headerLength),
new ArraySegment <byte>(buffer, 0, remainingLength)
});
}
}