diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3704ad3..c343c21 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 # Changelog
 
-## Development Build: v2.5.0-rc4:dev71
+## Development Build: v2.5.0-rc4+dev75
+- define msgids via topicids
+- See <https://github.com/nasa/to_lab/pull/176>
+
+## Development Build: v2.5.0-rc4+dev71
 - Add timeout and packet limit on sending telemetry
 - See <https://github.com/nasa/to_lab/pull/173>
 
diff --git a/arch_build.cmake b/arch_build.cmake
index 306476b..0c0ed47 100644
--- a/arch_build.cmake
+++ b/arch_build.cmake
@@ -20,8 +20,14 @@ set(TO_LAB_PLATFORM_CONFIG_FILE_LIST
 # This makes them individually overridable by the missions, without modifying
 # the distribution default copies
 foreach(TO_LAB_CFGFILE ${TO_LAB_PLATFORM_CONFIG_FILE_LIST})
+  get_filename_component(CFGKEY "${TO_LAB_CFGFILE}" NAME_WE)
+  if (DEFINED TO_LAB_CFGFILE_SRC_${CFGKEY})
+    set(DEFAULT_SOURCE GENERATED_FILE "${TO_LAB_CFGFILE_SRC_${CFGKEY}}")
+  else()
+    set(DEFAULT_SOURCE FALLBACK_FILE "${CMAKE_CURRENT_LIST_DIR}/config/default_${TO_LAB_CFGFILE}")
+  endif()
   generate_config_includefile(
     FILE_NAME           "${TO_LAB_CFGFILE}"
-    FALLBACK_FILE       "${CMAKE_CURRENT_LIST_DIR}/config/default_${TO_LAB_CFGFILE}"
+    ${DEFAULT_SOURCE}
   )
 endforeach()
diff --git a/config/default_to_lab_msgids.h b/config/default_to_lab_msgids.h
index 1efc360..6459b20 100644
--- a/config/default_to_lab_msgids.h
+++ b/config/default_to_lab_msgids.h
@@ -23,10 +23,12 @@
 #ifndef TO_LAB_MSGIDS_H
 #define TO_LAB_MSGIDS_H
 
-#define TO_LAB_CMD_MID     0x1880
-#define TO_LAB_SEND_HK_MID 0x1881
+#include "cfe_core_api_base_msgids.h"
+#include "to_lab_topicids.h"
 
-#define TO_LAB_HK_TLM_MID     0x0880
-#define TO_LAB_DATA_TYPES_MID 0x0881
+#define TO_LAB_CMD_MID        CFE_PLATFORM_CMD_TOPICID_TO_MIDV(TO_LAB_CMD_TOPICID)
+#define TO_LAB_SEND_HK_MID    CFE_PLATFORM_CMD_TOPICID_TO_MIDV(TO_LAB_SEND_HK_TOPICID)
+#define TO_LAB_HK_TLM_MID     CFE_PLATFORM_TLM_TOPICID_TO_MIDV(TO_LAB_HK_TLM_TOPICID)
+#define TO_LAB_DATA_TYPES_MID CFE_PLATFORM_TLM_TOPICID_TO_MIDV(TO_LAB_DATA_TYPES_TOPICID)
 
 #endif
diff --git a/config/default_to_lab_topicids.h b/config/default_to_lab_topicids.h
new file mode 100644
index 0000000..17a9093
--- /dev/null
+++ b/config/default_to_lab_topicids.h
@@ -0,0 +1,31 @@
+/************************************************************************
+ * NASA Docket No. GSC-18,719-1, and identified as “core Flight System: Bootes”
+ *
+ * Copyright (c) 2020 United States Government as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All Rights Reserved.
+ *
+ * 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
+ *   TO_LAB Application Topic IDs
+ */
+#ifndef TO_LAB_TOPICIDS_H
+#define TO_LAB_TOPICIDS_H
+
+#define TO_LAB_CMD_TOPICID        0x80
+#define TO_LAB_SEND_HK_TOPICID    0x81
+#define TO_LAB_HK_TLM_TOPICID     0x80
+#define TO_LAB_DATA_TYPES_TOPICID 0x81
+
+#endif
diff --git a/fsw/src/to_lab_version.h b/fsw/src/to_lab_version.h
index 5489591..c7469c8 100644
--- a/fsw/src/to_lab_version.h
+++ b/fsw/src/to_lab_version.h
@@ -24,7 +24,7 @@
 #define TO_LAB_VERSION_H
 
 /* Development Build Macro Definitions */
-#define TO_LAB_BUILD_NUMBER 71 /*!< Development Build: Number of commits since baseline */
+#define TO_LAB_BUILD_NUMBER 75 /*!< Development Build: Number of commits since baseline */
 #define TO_LAB_BUILD_BASELINE \
     "v2.5.0-rc4" /*!< Development Build: git tag that is the base for the current development */
 
diff --git a/mission_build.cmake b/mission_build.cmake
index 16344b3..6317f71 100644
--- a/mission_build.cmake
+++ b/mission_build.cmake
@@ -20,6 +20,7 @@ set(TO_LAB_MISSION_CONFIG_FILE_LIST
   to_lab_tbl.h
   to_lab_tbldefs.h
   to_lab_tblstruct.h
+  to_lab_topicids.h
 )
 
 if (CFE_EDS_ENABLED_BUILD)