Here are the classes, structs, unions and interfaces with brief descriptions:

[detail level 12345]

NOSDP
NNet
NConnections
CIOsdpConnection	Defines a connection for communicating via OSDP protocol
CIOsdpConnectionListener	Defines a connection listener for OSDP Peripheral Devices (PDs) that need to accept incoming connections from Access Control Units (ACUs)
CIRetunableOsdpConnection	A connection whose line rate can be changed while it stays open
COsdpConnection	Base OSDP connection class
COsdpConnectionListener	Base class for OSDP connection listeners that accept incoming connections from Access Control Units (ACUs)
CReadOnlySerialPortOsdpConnection	Read-only serial port connection for passive monitoring of OSDP traffic
CSerialPortConnectionListener	Implements a serial port connection listener for OSDP Peripheral Devices
CSerialPortOsdpConnection	Connect using a serial port
CTcpClientOsdpConnection	Connects using TCP/IP connection to a server
CTcpConnectionListener	Implements a TCP/IP connection listener for OSDP Peripheral Devices to accept incoming connections from ACUs
CTcpServerOsdpConnection	TCP server OSDP connection that allows a ControlPanel (ACU) to act as a TCP server, accepting connections from OSDP devices
NLineQuality
CBaudRateChange	A Baud Rate Change command (Command ID 0x02) from the Line Quality Test Procedure, section 3.5
CBaudRateChangeAck	A Baud Rate Change Acknowledgment (Reply ID 0x02) from the Line Quality Test Procedure, section 3.7
CEchoRequest	An Echo Request (Command ID 0x01) from the Line Quality Test Procedure, section 3.5
CEchoResponse	An Echo Response (Reply ID 0x01) from the Line Quality Test Procedure, section 3.7
CLineQualityReportMetadata	Details about an installation that the test cannot discover for itself, used to fill in the header of a written report
CLineQualityMarkdownReport	Renders a LineQualityReport as the Markdown report described in section 7 of the OSDP Line Quality Test Procedure
CLineQualityOptions	Options controlling a line quality test run
CLineQualityProgress	A progress update from a running line quality test
CLineQualityProtocol	Constants and helpers for the OSDP Line Quality Test Procedure
CCombinationResult	Results for a single pattern and payload size at one baud rate
CBaudRateResult	Results for every combination exercised at a single baud rate
CLineQualityReport	The complete results of a line quality test run
CLineQualityResponder	The responder side of the OSDP Line Quality Test Procedure: answers echo requests at the dedicated test address and follows the controller through baud rate changes
CLineQualityExchangeEventArgs	Describes a completed echo exchange handled by a LineQualityResponder
CLineQualityBaudRateChangedEventArgs	Describes a change in the rate a LineQualityResponder is answering at
CLineQualityTest	The controller side of the OSDP Line Quality Test Procedure: sweeps baud rates, bounces test patterns off a responder, and reports what survived
CLineQualityException	Raised when a line quality test cannot be run
NMessages
NSecureChannel
CACUMessageSecureChannel	Message channel which represents the Access Control Unit (ACU) side of the OSDP communications (i.e
CIMessageSecureChannel	Represents the secure channel context within which a message is packed/unpacked
CMessageSecureChannel	V2 implementation of a SecureChannel class
CSecurityBlock	Contains standard Security Control Block data that can be used when building messages
CSecurityContext	Security context used within MessageSecureChannel
CCommandReplyExtensions	Extension methods for CommandType and ReplyType enums
CIncomingMessage	Represents a message that was received from the wire
CMessage	A base message class for sending or replying
NModel
NCommandData
CACUReceiveSize	Command data to set the maximum message size the ACU can receive
CBiometricReadData	Command data to send a request to the PD to perform a biometric scan and match
CBiometricTemplateData	Command data to send a request to the PD to perform a biometric scan and return data
CCommandData	Base class representing a payload of a PD command message
CCommunicationConfiguration	Command data to set the communication configuration on a PD
CDeviceCapabilities	Represents the capabilities of a device within the context of OSDP (Open Supervised Device Protocol)
CEncryptionKeyConfiguration	Command data to set the encryption key configuration on a PD
CExtendedWrite	Extended write (transparent mode) command data sent to a PD
CFileTransferFragment	Command data to send a data fragment of a file to a PD
CGetPIVData	Command data to get the PIV data
CIdReport	Represents a command data type for generating an ID report request
CKeepReaderActive	Command data to set the keep alive time
CManufacturerSpecific	Manufacture specific command data sent to a PD
CMessageDataFragment	Represents a fragment of data for a multipart message
COutputControl	Contains data to control a single output on a PD
COutputControls	Command data to control the outputs of a PD
CReaderBuzzerControl	Command data to control the buzzer on a PD
CReaderLedControl	Contains data to control the color of a single LED on a PD
CReaderLedControls	Command data to control the color of LEDs
CReaderTextOutput	Command data for sending text to be shown on a PD
CServerCryptogramData	Represents the server cryptogram data used in a secure communication sequence
NReplyData
CAck	Generic ACK reply
CBiometricMatchResult	A biometric match reply after a scan
CBiometricReadResult	A biometric read reply
CCommunicationConfiguration	The actual communication configuration of the PD sent as a reply
CDataFragmentResponse	A multi-part message data fragment reply
CDeviceCapabilities	The PD device capabilities data sent as a reply
CDeviceCapability	Generic capability data for a PD
CMsgSizeDeviceCap	Common base for the device capabilities that identify byte sizes
CCommSecurityDeviceCap	Receive Buffer Size PD capability
CDeviceIdentification	The PD identification data sent as a reply
CExtendedDeviceIdentification	The extended PD identification data sent as a reply to an osdp_ID command with data 0x01
CExtendedDeviceIdentificationBuilder	Fluent builder for creating ExtendedDeviceIdentification instances
CExtendedIdEntry	Represents a single TLV (Tag-Length-Value) entry in the extended device identification response
CExtendedRead	An extended read (transparent mode) reply
CFileTransferStatus	The PD file transfer status sent as a reply
CFormattedCardData	A formated card data reply
CInputStatus	A input status report reply as defined in OSDP v2.2.2 specification
CKeypadData	A keypad reply
CLocalStatus	A local status report reply
CManufacturerSpecific	A manufacturer specific reply
CNak	A negative reply
COutputStatus	A output status report reply
CRawCardData	A raw card data reply
CReaderStatus	A reader status report reply
CReturnReplyData< T >	Reply from a command that has different possible results
CClientIdentification	Represents the Client Unique Identifier (cUID) used during an OSDP secure channel establishment
CIPacket	Represents a parsed OSDP packet with decoded message information
CPacket	Information details of a message packet
CPayloadData	Base class representing a payload an OSDP message
NPanelCommands
NDeviceDiscover
CDeviceDiscoveryException	Represents an error condition encountered during device discovery
CControlPanelInUseException	This exception will be thrown if a caller attempts to perform device discovery on a control panel that already has open connections
CDiscoveryOptions	Defines a set of optional parameters the caller can pass in to the ControlPanel.DiscoverDevice(System.Collections.Generic.IEnumerable<IOsdpConnection>, DiscoveryOptions) call
CDiscoveryResult	Contains the results of the device discovery
NTracing
CIFileSystem	Abstraction for file system operations to enable testing without actual file I/O
CIPacketTextFormatter	Interface for formatting OSDP packets as human-readable text
CMessageSpy	Provides functionality to parse and decode OSDP messages from raw byte data, tracking secure channel state for encrypted communications
COSDPCaptureEntry	One line entry of a file that captures OSDP messages
COSDPCaptureFileWriter	Writes OSDP packet captures to .osdpcap file format
COSDPPacketTextFormatter	Default implementation of IPacketTextFormatter for formatting OSDP packets as human-readable text
CPacketBuffer	Buffers incoming OSDP data from a stream and extracts complete packets
CParsedTextWriter	Writes parsed OSDP packets to a human-readable text file
CTraceEntry	Represents low level data sent on the wire between the control panel and the devices
NUtilities
CBinaryExtensions	Extension methods for helping with binary conversion
CBinaryUtils	Helper routines for manipulating binary representations of data that are used within the OSDP.NET library and its unit tests
CPollyfill	Provide backward compability to .NET standard 2.0
CControlPanel	The OSDP control panel used to communicate to Peripheral Devices (PDs) as an Access Control Unit (ACU)
CNakReplyEventArgs	A negative reply that has been received
CConnectionStatusEventArgs	A connection status has been changed
CLocalStatusReportReplyEventArgs	The local status report reply has been received
CInputStatusReportReplyEventArgs	The input status report reply has been received
COutputStatusReportReplyEventArgs	The output status report reply has been received
CReaderStatusReportReplyEventArgs	The reader status report reply has been received
CRawCardDataReplyEventArgs	The raw card data reply has been received
CFormattedCardDataReplyEventArgs	The formatted card data reply has been received
CManufacturerSpecificReplyEventArgs	The manufacture specific reply has been received
CExtendedReadReplyEventArgs	The extended read (transparent mode) reply has been received
CKeypadReplyEventArgs	The keypad reply has been received
CFileTransferStatus	Track the status of a file transfer to a PD
CFileTransferException	An error has occurred during a file transfer operation
CRawReplyEventArgs	A reply has been received
CDevice	Represents a Peripheral Device (PD) that communicates over the OSDP protocol
CDeviceComSetUpdatedEventArgs	Event arguments for DeviceComSetUpdated event, which is raised whenever ACU requests the device to update its address and/or baud rate
CDeviceConfiguration	Represents a set of configuration options to be used when initializing a new instance of the Device class
CFileTransferReceiver	Reassembles a file sent by an ACU through a sequence of osdp_FILETRANSFER commands and produces the osdp_FTSTAT reply that each fragment requires