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diff --git a/libccnx-transport-rta/ccnx/api/control/cpi_Connection.h b/libccnx-transport-rta/ccnx/api/control/cpi_Connection.h
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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file cpi_Connection.h
+ * @brief Represents a point-to-point tunnel over IP.
+ *
+ * The carries can be UDP, TCP, or GRE
+ *
+ * We use InterfaceGeneric to back this type.  We always use 2 addresses in the address list.
+ * Address 0 is the source and address 1 is the destination.
+ *
+ */
+#ifndef libccnx_cpi_Connection_h
+#define libccnx_cpi_Connection_h
+
+#include <ccnx/api/control/cpi_InterfaceType.h>
+#include <ccnx/api/control/cpi_Address.h>
+
+struct cpi_connection;
+typedef struct cpi_connection CPIConnection;
+
+typedef enum {
+    cpiConnection_GRE,
+    cpiConnection_TCP,
+    cpiConnection_UDP,
+    cpiConnection_MULTICAST,
+    cpiConnection_L2
+} CPIConnectionType;
+
+/**
+ * Return a static, nul-terminated C string representing the given `CPIConnectionType`
+ *
+ * @param type A valid CPIConnectionType value.
+ * @return A static, nul-terminated C string
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+const char *cpiConnectionType_ToString(CPIConnectionType type);
+
+/**
+ * <#OneLineDescription#>
+ *
+ *   <#Discussion#>
+ *
+ * @param <#param1#>
+ * @return <#return#>
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+CPIConnectionType cpiConnectionType_FromString(const char *typeAsString);
+
+/**
+ * <#OneLineDescription#>
+ *
+ *   <#Discussion#>
+ *
+ * @param <#param1#>
+ * @return <#return#>
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+PARCBufferComposer *cpiConnectionType_BuildString(CPIConnectionType type, PARCBufferComposer *composer);
+
+/**
+ * A representation of a Connection, being two addresses and a type
+ *
+ *   <#Discussion#>
+ *
+ * @param ifidx The interface index
+ * @param source is the local address
+ * @param destination is the remote address
+ * @return <#return#>
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+CPIConnection *cpiConnection_Create(unsigned ifidx, CPIAddress *source, CPIAddress *destination, CPIConnectionType connType);
+
+
+CPIConnection *cpiConnection_Acquire(const CPIConnection *conn);
+
+/**
+ * Creates a reference counted copy
+ *
+ *   <#Discussion#>
+ *
+ * @param <#param1#>
+ * @return An allocated copy, you must destroy it
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+CPIConnection *cpiConnection_Copy(const CPIConnection *conn);
+
+/**
+ * Reference counted release
+ *
+ *   Only on the last reference will the call free the contents.
+ *
+ * @param <#param1#>
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+void cpiConnection_Release(CPIConnection **connPtr);
+
+/**
+ * A connection may be up, down, or don't know state.
+ *
+ *   <#Discussion#>
+ *
+ * @param <#param1#>
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+void cpiConnection_SetState(CPIConnection *conn, CPIInterfaceStateType state);
+
+/**
+ * Returns the interface index
+ *
+ *   <#Discussion#>
+ *
+ * @param <#param1#>
+ * @return The interface index
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+unsigned cpiConnection_GetIndex(const CPIConnection *conn);
+
+/**
+ * The source address
+ *
+ *   This is not a copy, it is the pointer to what is in the object.  If you
+ *   want to save it, make a copy.
+ *
+ * @param <#param1#>
+ * @return Do not destroy it.
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+const CPIAddress *cpiConnection_GetSourceAddress(const CPIConnection *conn);
+
+/**
+ * The destination (remote) address
+ *
+ *   This is not a copy, it is the pointer to what is in the object.  If you
+ *   want to save it, make a copy.
+ *
+ * @param <#param1#>
+ * @return Do not destroy it.
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+const CPIAddress *cpiConnection_GetDestinationAddress(const CPIConnection *conn);
+
+/**
+ * The type of connection
+ *
+ *   A connection may be a TCP tunnel, UDP tunnel, IP multicast overlay,
+ *   PF_LOCAL connection, or a layer 2 connection.
+ *
+ * @param <#param1#>
+ * @return <#return#>
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+CPIConnectionType         cpiConnection_GetConnectionType(const CPIConnection *conn);
+
+/**
+ * The connection state, Up, Down, or Don't Know
+ *
+ *   <#Discussion#>
+ *
+ * @param <#param1#>
+ * @return <#return#>
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+CPIInterfaceStateType  cpiConnection_GetState(const CPIConnection *conn);
+
+/**
+ * Determine if two CPIConnection instances are equal.
+ *
+ * Two CPIConnection instances are equal if, and only if,
+ * (a) the interface index is the same, (b) the connection types are the same,
+ * (c) the connection state is the same, (d) the source address are the same, and
+ * (e) the destination addresses are the same.
+ *
+ * The following equivalence relations on non-null `CPIConnection` instances are maintained:
+ *
+ *  * It is reflexive: for any non-null reference value x, `CPIConnection_Equals(x, x)`
+ *      must return true.
+ *
+ *  * It is symmetric: for any non-null reference values x and y,
+ *    `cpiConnection_Equals(x, y)` must return true if and only if
+ *        `cpiConnection_Equals(y, x)` returns true.
+ *
+ *  * It is transitive: for any non-null reference values x, y, and z, if
+ *        `cpiConnection_Equals(x, y)` returns true and
+ *        `cpiConnection_Equals(y, z)` returns true,
+ *        then  `cpiConnection_Equals(x, z)` must return true.
+ *
+ *  * It is consistent: for any non-null reference values x and y, multiple
+ *      invocations of `cpiConnection_Equals(x, y)` consistently return true or
+ *      consistently return false.
+ *
+ *  * For any non-null reference value x, `cpiConnection_Equals(x, NULL)` must
+ *      return false.
+ *
+ * @param a A pointer to a `CPIConnection` instance.
+ * @param b A pointer to a `CPIConnection` instance.
+ * @return true if the two `CPIConnection` instances are equal.
+ *
+ * Example:
+ * @code
+ * {
+ *    CPIConnection *a = cpiConnection_Create();
+ *    CPIConnection *b = cpiConnection_Create();
+ *
+ *    if (cpiConnection_Equals(a, b)) {
+ *        // true
+ *    } else {
+ *        // false
+ *    }
+ * }
+ * @endcode
+ */
+bool cpiConnection_Equals(const CPIConnection *a, const CPIConnection *b);
+
+/**
+ * A JSON representation of the connection
+ *
+ *   <#Discussion#>
+ *
+ * @param <#param1#>
+ * @return An allocated object that you must destroy
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+PARCJSON *cpiConnection_ToJson(const CPIConnection *conn);
+
+/**
+ * Creates a Connection object based on a JSON representation.
+ *
+ *   Will assert if there's a parsing error
+ *
+ * @param <#param1#>
+ * @return An allocated connection that you must destroy
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+CPIConnection *cpiConnection_CreateFromJson(PARCJSON *json);
+
+/**
+ * <#OneLineDescription#>
+ *
+ *   <#Discussion#>
+ *
+ * @param <#param1#>
+ * @return <#return#>
+ *
+ * Example:
+ * @code
+ * <#example#>
+ * @endcode
+ */
+char *cpiConnection_ToString(const CPIConnection *connection);
+#endif // libccnx_cpi_Connection_h