<PackageReference Include="BouncyCastle.Cryptography" Version="2.5.0" />

Org.BouncyCastle.Tls.HeartbeatExtension

public sealed class HeartbeatExtension
namespace Org.BouncyCastle.Tls { public sealed class HeartbeatExtension { public short Mode { get; } public HeartbeatExtension(short mode); public void Encode(Stream output); public static HeartbeatExtension Parse(Stream input); } }