Index: scripts/MsgUtils/msgutils/templates/MsgHandlingIni.jinja
===================================================================
diff -u -r64243101dff61b5c1a40b96ef33080236999acf6 -rc6a4b63a37f3beb1e8a51702ec3a56a1c32cfe8f
--- scripts/MsgUtils/msgutils/templates/MsgHandlingIni.jinja	(.../MsgHandlingIni.jinja)	(revision 64243101dff61b5c1a40b96ef33080236999acf6)
+++ scripts/MsgUtils/msgutils/templates/MsgHandlingIni.jinja	(.../MsgHandlingIni.jinja)	(revision c6a4b63a37f3beb1e8a51702ec3a56a1c32cfe8f)
@@ -1,7 +1,25 @@
-{%- for msg in msg_ini.data.values() -%}
+; Group format:
+;   [ <MsgId hex value> ]
+;   msg_id = <MsgId string>
+{%- set config = namespace(actions = []) %}
+{%- for action in msg_ini.VALID_ACTIONS %}
+{%-     set config.actions = config.actions + [ action ] %}
+{%- endfor %}
+;   action = <{{ config.actions | join("|") }}> (default: {{ msg_ini.DEFAULT_ACTION }})
+{%- set config = namespace(topics = []) %}
+{%- for topic in msg_ini.VALID_TOPICS %}
+{%-     set config.topics = config.topics + [ topic ] %}
+{%- endfor %}
+;   topic = <{{ config.topics | join("|") }}> (default: {{ msg_ini.DEFAULT_TOPIC }})
+
+{% for msg in msg_ini.data.values() -%}
 [{{ msg.msg_id_hex_string }}]
 msg_id = {{ msg.msg_id }}
+{%- if msg.action | length %}
 action = {{ msg.action }}
+{%- endif %}
+{%- if msg.topic | length %}
 topic = {{ msg.topic }}
+{%- endif %}
 
 {% endfor -%}