Version 1.1.0

• [added] clean-up mechanism for blockwise transfer state
• [added] filter when notifying observers
• [added] send and receive events to IEndPoint
• [added] support for cancelling reject messages
• [added] support for cancelling blockwise transfer
• [added] support for blockwise transfers with NON
• [updated] rename obsoleted events and properties in CoAP Message
• [updated] mark as CLSCompliant
• [updated] lazy initializing lock in a request to avoid locks if possible
• [updated] collection classes for .NET 2.0
• [fixed] potential stack overflow in underlying UDP channel
• [fixed] Message ID conflict
• [fixed] incomplete cleanup when reregister a observation
• [fixed] race condition when cancelling retransmission
• [fixed] for parentless resources
• [fixed] RTT for blockwise transfers
• [fixed] success range for code constants

Version 1.0.0

• [added] support for RFC7252!
• [improved] redefine compile symbols
• [improved] rename events and properties in CoAP Message
• [improved] allow random block request
• [improved] separate CoAP.Proxy namespace
• [improved] update Common.Logging to v3.0.0
• [fixed] incorrect link format serialization
• [fixed] null reference in CoAPClient.Discover()
• [fixed] a lot of others

Version 0.18

• [added] support for CoAP-18
• [added] new layers and stack structure
• [added] new server and client APIs
• [added] datagram channels for data transmission
• [added] full configuration
• [improved] UDP transmission with SocketAsyncEventArgs for .NET 4+
• [improved] threading with TPL for .NET 4+
• [improved] logging with Common.Logging
• [fixed] lots of bugs

Version 0.13.4

• [fixed] potential breaks in UDP transmission
• [improved] diff assembly title with draft version

Version 0.13.3

• [added] Request.SequenceTimeout to override overall timeout in
  TokenLayer
• [fixed] incorrect match of tokens in TokenManager

Version 0.13.2

• [added] ICommunicator to represent communicators
• [added] ICoapConfig to pass initial variables (refs #8)
• [added] HTTP/CoAP proxy (experimental)
• [added] build for .NET 4.0
• [improved] dispatch requests with thread pool in LocalEndPoint
• [improved] only timeout requests if SequenceTimeout is greater
  than 0 in TokenLayer
• [improved] move resources to separate namespace Resources, and
  add a TimerResource for timed observable resources.

Version 0.13.1

• add timeout and max retransimit to each message
• enable log levels
• fix null reference to next block in TransferLayer