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@@ -1,11 +1,149 @@
+# Harena Message Protocol
+## Topic Structure and Wildcards
+The wildcards standard is based in the MQTT 3.1.1, as specified in the document: [MQTT Version 3.1.1](http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html), Section 4.7.1 Topic wildcards.
+
+Extra information is based on:
+The HiveMQ Team. MQTT Essentials Part 5: MQTT Topics & Best Practices. February 9, 2015. online: https://www.hivemq.com/blog/mqtt-essentials-part-5-mqtt-topics-best-practices/.
+## Topic Name Structure
+
+Whenever a message is published or subscribed a **Topic Name** is specified. It is a hierarchical structure composed by one or more **Topic Levels** separated by slashes `/` (the **Topic Level Separators**).
+
+* **Topic Level** - Is a label formed with alphanumeric characters, and can also have: white space, underscore and minus.
+
+## Best Practices
+The following best practices have been adopted in the Harena project and must be followed by all developers. They are derived from [MQTT Essentials Part 5: MQTT Topics & Best Practices](https://www.hivemq.com/blog/mqtt-essentials-part-5-mqtt-topics-best-practices/).
+
+* **Never use a leading forward slash** - A Topic Name can optionally start and/or end by a slash `/`, but it adds an extra unnecessary level, therefore they are not adopted in Harena.
+
+* **Never use spaces in a topic** - Even though MQTT supports spaces, they are not used in Harena.
+
+## Topic Filters and Wildcards
+
+In the subscription process, it is possible to specify a specific Topic Name or a Topic Filter, which works as a regular expression representing a set of possible Topic Names.
+
+Wildcards are represented by the special `#` and/or `+` characters, appearing inside a Topic Name in the subscription process. They enable the subscription of a set of topics, since they generically represent one or more Topic Levels, according to the following rules:
+### Multilevel Wildcard `#`
+The wildcard `#` can be used only in two positions in the Topic Filter:
+* alone (the filter is only a `#`) - matches any Topic Name with any number of levels;
+* end of the Topic Name (always preceded by a `/ `) -  matches any number of Topic Levels with the prefix specified before the wildcard.
+
+### Single Level Wildcard `+`
+Only a single Topic Level can be matched by the wildcard  `+`, which represents any possible complete Topic Level Label. The `+` wildcard can appear only in four positions:
+* alone (the filter is only a `+`) - matches any Topic Label in a single level (without slashes);
+* beginning of the Topic Filter, always followed by a slash;
+* end of the Topic Filter, always preceded by a slash;
+* middle of the Topic Filter, always between two slashes.
 # Message Paths in the Bus
+## Control Actions
+
+General protocol: `control/<entity>/<action>`.
+
+Most of the control actions trigger the final action, for example, the `control/case/load` control action is the start of the process to trigger the `case/<case id>/load` action.
+
+* `control/case/load`
+* `control/case/selected`
 
+* `control/case/save`
+* `control/case/play`
+* `control/knot/edit`
+* `control/config/edit`
+ 
 ## Persisted Messages
 
 All the internal paths are mapped to the external paths prefixing the path by: `/execution/<instance id>`, where `<instance id>` is the id of the case instance that is being executed.
 
-### Entity: `dcc-input`
-* `set <variable>` \[`/dcc-input/set/<variable>`\] - Notifies the input of a value by the user related to a `<variable>`.
+### Entity: `template_family`
+* `template_family/*/get` - Returns the list of the available template families.
+
+  response topic: `template_family/*`
+           message: {<template_family id>: <template_family icon>}
+
+### Entity: `template`
+* `template/<template_family id>.<template id>/get` - Loads and returns the HTML of the template.
+
+  response topic: `template/<template_family id>.<template id>`
+           message: <template HTML>
+
+
+### Entity: `case`
+* `case/*/get` - Returns the list of the available cases.
+
+  response topic: `case/*`
+           message: {<case id>: <case icon>}
+
+* `case/<case id>/get` - Loads and returns the markdown of the case.
+
+  response topic: `case/<case id>`
+           message: <case markdown>
+
+* `case/<case id>/set` - Saves the case in a markdown or object format (according to the format specified in the message).
+
+  message: {format: "markdown" | "json", source: <case source>}
+
+  * markdown format
+
+    response topic: `case/<case id>/version`
+           message: <version id> - id of the previous case version.
+
+  * object format
+
+    response topic: `case/<case id>/set/status`
+           message: <status> - status of the opperation.
+
+* `case/<case id>/set` - Saves the markdown of the case.
+
+  response topic: `case/<case id>/version`
+           message: <version id> - id of the previous case version.
+
+
+* `case/<case id>/prepare` - Prepares the environment where the case will run in HTML.
+
+  message: `{templateFamily: <template_family id>}` - template family to generate the HTML version of the case.
+
+  response topic: `case/<case id>/prepare/status`
+           message: <status> - status of the preparation.
+### Entity: `knot`
+`<knot title>` - The title given by the author to the knot in the case.
+`<knot id>` - Uniquely identifies a knot. Derived from the knot title replacing spaces for underscores (as we do not use spaces in the topics).
+
+* `knot/<knot id>/selected` - A knot has been selected in the authoring environment.
+
+  message: `<knot title>`
+
+* `knot/<knot id>/set` - Save a HTML version of the knot.
+
+  message: `{caseId: <case id>, format: "html", source: <html source>}`
+
+* `knot/<knot id>/navigate` - The player navigates to a specific knot.
+"knot/</navigate"
+      "knot/<</navigate"
+      "
+
+### Entity: `variable`
+
+Variable input cycle:
+  * `var/<variable>/input/ready`
+  * `var/<variable>/typed`
+  * `var/<variable>/changed`
+  * `var/<variable>/set`
+  * `var/<variable>/input/end`
+
+#### Details
+
+* `var/<variable>/typed` - Notifies that the user typed part of an input.
+
+  message: `{sourceType: "dcc-input",
+             value: "<value>"}`
+
+* `var/<variable>/changed` - Notifies a change em the input variable.
+
+  message: `{sourceType: "dcc-input",
+             value: "<value>"}`
+
+* `var/<variable>/set` - Notifies the input of a value by the user related to a `<variable>`.
+
+  message: `{sourceType: "dcc-input",
+             value: "<value>"}`
 
 ## Messages Not Persisted
 
@@ -25,5 +163,7 @@ Operations:
 
 Operations:
 * `get states` \[`/dcc-state-selector/get/states`\] - Requests for an upper level DCC (e.g., an aggregattor DCC) or a group coordinator DCC the set of possible states present in the selector.
-  
+ 
   return: \[`/dcc-state-selector/states`\] - List of states separated by commas.
+
+