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diff --git a/rtrlib/transport/transport.h b/rtrlib/transport/transport.h
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+/*
+ * This file is part of RTRlib.
+ *
+ * This file is subject to the terms and conditions of the MIT license.
+ * See the file LICENSE in the top level directory for more details.
+ *
+ * Website: http://rtrlib.realmv6.org/
+ */
+
+/**
+ * @defgroup mod_transport_h Transport sockets
+ * @brief The RTR transport sockets implement the communication channel
+ * (e.g., SSH, TCP, TCP-AO) between an RTR server and client.
+ * @details Before using the transport socket, a tr_socket must be
+ * initialized based on a protocol-dependent init function (e.g.,
+ * tr_tcp_init()).\n
+ * The tr_* functions call the corresponding function pointers, which are
+ * passed in the tr_socket struct, and forward the remaining arguments.
+ *
+ * @{
+ */
+
+#ifndef RTR_TRANSPORT_H
+#define RTR_TRANSPORT_H
+
+#include <time.h>
+
+/**
+ * @brief Default connect timeout
+ */
+#define RTRLIB_TRANSPORT_CONNECT_TIMEOUT_DEFAULT 30
+
+/**
+ * @brief The return values for tr_ functions.
+ */
+enum tr_rtvals {
+	/** @brief Operation was successful. */
+	TR_SUCCESS = 0,
+
+	/** Error occurred. */
+	TR_ERROR = -1,
+
+	/** No data is available on the socket. */
+	TR_WOULDBLOCK = -2,
+
+	/** Call was interrupted from a signal */
+	TR_INTR = -3,
+
+	/** Connection closed */
+	TR_CLOSED = -4
+};
+
+struct tr_socket;
+
+/**
+ * @brief A function pointer to a technology specific close function.
+ * \sa tr_close
+ */
+typedef void (*tr_close_fp)(void *socket);
+
+/**
+ * @brief A function pointer to a technology specific open function.
+ * \sa tr_open
+ */
+typedef int (*tr_open_fp)(void *socket);
+
+/**
+ * @brief A function pointer to a technology specific free function.
+ * All memory associated with the tr_socket will be freed.
+ * \sa tr_free
+ */
+typedef void (*tr_free_fp)(struct tr_socket *tr_sock);
+
+/**
+ * @brief A function pointer to a technology specific recv function.
+ * \sa tr_recv
+ */
+typedef int (*tr_recv_fp)(const void *socket, void *pdu, const size_t len, const time_t timeout);
+
+/**
+ * @brief A function pointer to a technology specific send function.
+ * \sa tr_send
+ */
+typedef int (*tr_send_fp)(const void *socket, const void *pdu, const size_t len, const time_t timeout);
+
+/**
+ * @brief A function pointer to a technology specific info function.
+ * \sa tr_send
+ */
+typedef const char *(*tr_ident_fp)(void *socket);
+
+/**
+ * @brief A transport socket datastructure.
+ *
+ * @param socket A pointer to a technology specific socket.
+ * @param open_fp Pointer to a function that establishes the socket connection.
+ * @param close_fp Pointer to a function that closes the socket.
+ * @param free_fp Pointer to a function that frees all memory allocated with this socket.
+ * @param send_fp Pointer to a function that sends data through this socket.
+ * @param recv_fp Pointer to a function that receives data from this socket.
+ */
+struct tr_socket {
+	void *socket;
+	tr_open_fp open_fp;
+	tr_close_fp close_fp;
+	tr_free_fp free_fp;
+	tr_send_fp send_fp;
+	tr_recv_fp recv_fp;
+	tr_ident_fp ident_fp;
+};
+
+#endif
+/** @} */