diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4a3348ec..14964ecf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,10 +1,6 @@
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.9)
 project(aws-c-mqtt C)
 
-if (POLICY CMP0069)
-    cmake_policy(SET CMP0069 NEW) # Enable LTO/IPO if available in the compiler, see AwsCFlags
-endif()
-
 option(ASSERT_LOCK_HELD "Enable ASSERT_SYNCED_DATA_LOCK_HELD for checking thread issue" OFF)
 if (ASSERT_LOCK_HELD)
     add_definitions(-DASSERT_LOCK_HELD)
@@ -39,39 +35,44 @@ include(AwsFindPackage)
 
 file(GLOB AWS_MQTT_HEADERS
         "include/aws/mqtt/*.h"
-        )
+)
 
 file(GLOB AWS_MQTT5_HEADERS
         "include/aws/mqtt/v5/*.h"
-        )
+)
+
+file(GLOB AWS_MQTT_RR_HEADERS
+        "include/aws/mqtt/request-response/*.h"
+)
 
 file(GLOB AWS_MQTT_PRIV_HEADERS
         "include/aws/mqtt/private/*.h"
+        "include/aws/mqtt/private/request-response/*.h"
         "include/aws/mqtt/private/v5/*.h"
-        )
+)
 
 file(GLOB AWS_MQTT_PRIV_EXPOSED_HEADERS
         "include/aws/mqtt/private/mqtt_client_test_helper.h"
-        )
+)
 
 file(GLOB AWS_MQTT_SRC
         "source/*.c"
         "source/v5/*.c"
         "source/request-response/*.c"
-        )
+)
 
 file(GLOB MQTT_HEADERS
         ${AWS_MQTT_HEADERS}
         ${AWS_MQTT_PRIV_HEADERS}
-        )
+)
 
 file(GLOB AWS_MQTT5_HEADERS
         ${AWS_MQTT5_HEADERS}
-        )
+)
 
 file(GLOB MQTT_SRC
         ${AWS_MQTT_SRC}
-        )
+)
 
 add_library(${PROJECT_NAME} ${MQTT_HEADERS} ${MQTT_SRC})
 aws_set_common_properties(${PROJECT_NAME})
@@ -94,13 +95,14 @@ aws_prepare_shared_lib_exports(${PROJECT_NAME})
 
 install(FILES ${AWS_MQTT_HEADERS} DESTINATION "include/aws/mqtt" COMPONENT Development)
 install(FILES ${AWS_MQTT5_HEADERS} DESTINATION "include/aws/mqtt/v5" COMPONENT Development)
+install(FILES ${AWS_MQTT_RR_HEADERS} DESTINATION "include/aws/mqtt/request-response" COMPONENT Development)
 install(FILES ${AWS_MQTT_TESTING_HEADERS} DESTINATION "include/aws/testing/mqtt" COMPONENT Development)
 install(FILES ${AWS_MQTT_PRIV_EXPOSED_HEADERS} DESTINATION "include/aws/mqtt/private" COMPONENT Development)
 
 if (BUILD_SHARED_LIBS)
-   set (TARGET_DIR "shared")
+    set (TARGET_DIR "shared")
 else()
-   set (TARGET_DIR "static")
+    set (TARGET_DIR "static")
 endif()
 
 install(EXPORT "${PROJECT_NAME}-targets"
diff --git a/README.md b/README.md
index 2f99277e..6a6a7bf5 100644
--- a/README.md
+++ b/README.md
@@ -4,13 +4,13 @@ C99 implementation of the MQTT 3.1.1 and MQTT 5 specifications.
 
 ## License
 
-This library is licensed under the Apache 2.0 License. 
+This library is licensed under the Apache 2.0 License.
 
 ## Usage
 
 ### Building
 
-CMake 3.1+ is required to build.
+CMake 3.9+ is required to build.
 
 `<install-path>` must be an absolute path in the following instructions.
 
@@ -203,6 +203,6 @@ the wire. For QoS 1, as soon as PUBACK comes back. For QoS 2, PUBCOMP. `topic` a
 ```c
 int aws_mqtt_client_connection_ping(struct aws_mqtt_client_connection *connection);
 ```
-Sends a PINGREQ packet to the server. 
+Sends a PINGREQ packet to the server.
 
 [aws-c-io]: https://github.com/awslabs/aws-c-io
diff --git a/include/aws/mqtt/mqtt.h b/include/aws/mqtt/mqtt.h
index 8d632fd4..d71d96a5 100644
--- a/include/aws/mqtt/mqtt.h
+++ b/include/aws/mqtt/mqtt.h
@@ -90,6 +90,9 @@ enum aws_mqtt_error {
     AWS_ERROR_MQTT_REQUEST_RESPONSE_INTERNAL_ERROR,
     AWS_ERROR_MQTT_REQUEST_RESPONSE_PUBLISH_FAILURE,
     AWS_ERROR_MQTT_REUQEST_RESPONSE_STREAM_ALREADY_ACTIVATED,
+    AWS_ERROR_MQTT_REQUEST_RESPONSE_MODELED_SERVICE_ERROR,
+    AWS_ERROR_MQTT_REQUEST_RESPONSE_PAYLOAD_PARSE_ERROR,
+    AWS_ERROR_MQTT_REQUEST_RESPONSE_INVALID_RESPONSE_PATH,
 
     AWS_ERROR_END_MQTT_RANGE = AWS_ERROR_ENUM_END_RANGE(AWS_C_MQTT_PACKAGE_ID),
 };
diff --git a/source/mqtt.c b/source/mqtt.c
index 252cbd49..392dda20 100644
--- a/source/mqtt.c
+++ b/source/mqtt.c
@@ -259,7 +259,16 @@ bool aws_mqtt_is_valid_topic_filter(const struct aws_byte_cursor *topic_filter)
                 "Request-response operation failed because the associated publish failed synchronously."),
             AWS_DEFINE_ERROR_INFO_MQTT(
                 AWS_ERROR_MQTT_REUQEST_RESPONSE_STREAM_ALREADY_ACTIVATED,
-                "Streaming operation activation failed because the operaation had already been activated."),
+                "Streaming operation activation failed because the operation had already been activated."),
+            AWS_DEFINE_ERROR_INFO_MQTT(
+                 AWS_ERROR_MQTT_REQUEST_RESPONSE_MODELED_SERVICE_ERROR,
+                 "Request-response operation failed with a modeled service error."),
+            AWS_DEFINE_ERROR_INFO_MQTT(
+                 AWS_ERROR_MQTT_REQUEST_RESPONSE_PAYLOAD_PARSE_ERROR,
+                 "Request-response operation failed due to an inability to parse the payload."),
+            AWS_DEFINE_ERROR_INFO_MQTT(
+                 AWS_ERROR_MQTT_REQUEST_RESPONSE_INVALID_RESPONSE_PATH,
+                 "Request-response operation failed due to arrival on an unknown response path"),
         };
 /* clang-format on */
 #undef AWS_DEFINE_ERROR_INFO_MQTT