> For the complete documentation index, see [llms.txt](https://docs.bluefletch.com/bluefletch-enterprise/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bluefletch.com/bluefletch-enterprise/product-guides/device-applications/messaging/features.md).

# Features

## Overview

BlueFletch Messaging enables communication with the device through notification messages in the drawer or by passing messages to device applications. It utilizes the MQTT protocol, supporting TLS/SSL in Messaging 3.4.2 and above, with the service automatically handling connections to MQTT Broker services.

## User Guide

When the Launcher boots, it will communicate with the Messaging application to start. It will then register the MQTT Brokers according to the configuration values.\
\
If the enableNotificationsAlwaysOn setting is true, the MQTT broker will be connected. If the enableNotificationsAlwaysOn setting is false, additional connections can be made after the user logs into the device.\
\
By default, the Messaging service will register for the following topics:

* Device Serial Number
* User Role
* Location
* Groups

Additional Information on the MQTT Protocol can be found at <https://github.com/mqtt/mqtt.github.io/wiki>.


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