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

[detail level 123]

▼NXPMP2
▼CAircraft	Actual representation of all aircraft in XPMP2
CSndChTy	Operational values per sound channel, that is triggered by a standard sound event
CwakeTy	Wake dataRef support
▼CCSLModel	Represents a CSL model as it is saved on disk
CMatchCritTy	Combines match-relevant fields (beside ICAO a/c type)
▼CCSLModelInfo_t	Collates some information on the CSL model
CMatchCrit_t	Any number of airline codes and/or liveries can be assigned to a model for matching purpose
CCSLObj	One `.obj` file of a CSL model (of which it can have multiple)
CDoc8643	Represents a line in the Doc8643.txt file, of which we use only classification and WTC
CFmodError	Exception class to pass on error information
CGlobVars	All global config settings and variables are kept in one structure for convenient access and central definition
CInetAddrTy	Numerical IP address, used for both ipv4 and ipv6, for ease of handling
CInetAddrTy.__unnamed6__
CinfoDataRefsTy	Keeps the dataRef handles for one of the up to 63 shared data slots ("sim/multiplayer/position/plane#...")
CLegacyAircraft	This class helps creating aircraft via the legacy global functions. It provides standard implementations of the abstract callbacks
CLocalIntfAddrTy	Stores information about local interface addresses
CmultiDataRefsTy	Keeps the dataRef handles for one of the up to 19 legacy AI/Multiplayer slots ("sim/multiplayer/position")
CNetRuntimeError	Exception raised by XPMP2::SocketNetworking objects
CObj8DataRefs	A pair of strings, first one to search for, second one to replace it with
▼CRemoteAcAnimTy	A/C animation dataRef changes
CDataRefValTy	DataRef animation types and value
CRemoteAcDetailTy	A/C details, packed into an array message
CRemoteAcDetailTy_v0	Version 0 A/C details, packed into an array message
CRemoteAcPosUpdateTy	A/C Position updates based on global coordinates
CRemoteAcRemoveTy	A/C Removal only includes the plane id, structure required for msgSize() function
CRemoteCBFctTy	Function prototypes for callback functions to handle the received messages
CRemoteDataRefPackTy	Definition for how to map dataRef values to (u)int8, ie. to an integer range of 8 bits
CRemoteMsgAcAnimTy	A/C animation dataRef message, has an inherited header plus an array of variable sized XPMP2::RemoteAcAnimTy elements
CRemoteMsgAcDetailTy	A/C detail message, has an inherited header plus an array of XPMP2::RemoteAcDetailTy elements
CRemoteMsgAcDetailTy_v0	Version 0 A/C detail message, has an inherited header plus an array of XPMP2::RemoteAcDetailTy elements
CRemoteMsgAcPosUpdateTy	A/C detail message, has an inherited header plus an array of XPMP2::RemoteAcDetailTy elements
CRemoteMsgAcRemoveTy	A/C removal message, an array of plane ids
CRemoteMsgBaseTy	Message header, identical for all message types
CRemoteMsgBeaconTy	"Beacon of Interest", ie. some message on the multicast just to wake up sender
CRemoteMsgSettingsTy	Settings message, identifying a sending plugin, regularly providing its settings
CRmtAcCacheTy	Holds a copy of some aircraft data as was sent out last
CRmtDataAcAnimTy	Animation dataRef requires a special queue data type as each msg element is already of variable length
CRmtDataAcAnimTy.__unnamed8__
CRmtDataBaseTy	Base structure for passing information from XP's main thread to the multicast thread
CRmtDataEnqeueTy	Passing information about any data type (like a/c full detail message); the data is contained as copy
CRmtMsgBufTy	Helper class to manage the temporary buffers in which the network message are put together
CSockAddrTy	Helper definition for all these IPv4/6 differences
CSockAddrTy.__unnamed4__
CSocketNetworking	Base class for any socket-based networking
CSoundChannel	A sound object being played, called channel
CSoundDefTy	Definition of how sound is handled based on dataRef values (type)
CSoundFile	Represents a sound file
CSoundFMOD	Represents a sound file to be passed on to FMOD to be played
CSoundSystem	Base class for sound systems, practically empty
CSoundSystemFMOD	Encapsulates direct access to the FMOD Sound System
CSoundSystemXP	Encapsulates the XP12 Sound System
CSoundWAV	Represents a WAV file, read into memory, played by XP's Sound API
▼CTcasLightsTy	A structure simplifying communicaton with sim/cockpit2/tcas/targets/position/lights
CBitsTy
CTCPConnection	Listens to TCP connections and opens a session socket upon connect
CUDPMulticast	UDP Multicast, always binding to INADDR_ANY
CUDPReceiver	Receives UDP messages
CXPMP2Error	XPMP2 Exception class, e.g. thrown if there are no CSL models or duplicate modeS_ids when creating an Aircraft
CXPMPPlaneNotifierTy	Stores the function and refcon pointer for plane creation/destrcution notifications
CXPCAircraft	Legacy wrapper class as provided by original libxplanemp
Cxpmp_LightStatus	Defines, which lights of the aircraft are on
Cxpmp_LightStatus.__unnamed2__
CXPMPPlanePosition_t	This data structure contains the basic position info for an aircraft
CXPMPPlaneSurfaces_t	External physical configuration of the plane