> For the complete documentation index, see [llms.txt](https://docs.yudash.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.yudash.com/device-to-cloud-api/cloud-protocols/mqtt.md).

# MQTT

MQTT is the most popular IoT cloud protocol. YuDash IoT device acts as MQTT client which sends data to various IoT platforms in a seamless manner. Two-way communication for receiving command from cloud is also available.

**Following are the steps to use MQTT as cloud protocol.**

### Selection of MQTT As Cloud Protocol in YuDash IoT Device

<figure><img src="/files/ZxgNh1RXxgitlFWU1DU7" alt=""><figcaption></figcaption></figure>

### MQTT Credentials

Following are the settings in LYNX to configure connection to MQTT server:

<figure><img src="/files/zEnA4E8hCbG8wJQjElh5" alt=""><figcaption></figcaption></figure>

<table><thead><tr><th width="230">MQTT Setting</th><th>Description</th></tr></thead><tbody><tr><td><strong>MQTT Server (Broker)</strong></td><td>The URL of MQTT broker is accessible on network. Alternately, unique IP address can be provided. This may be required for a local deployment.</td></tr><tr><td><strong>MQTT Port</strong></td><td>The IP port running MQTT server. Typically 1883</td></tr><tr><td><strong>MQTT User name</strong></td><td>Client user name for MQTT broker - Based on server, it may be blank or Access Tokens are used as user name.</td></tr><tr><td><strong>MQTT Password</strong></td><td>Client password for MQTT broker. Based on server, it may be blank or Access Tokens are given in password. </td></tr><tr><td><strong>MQTT Client Name</strong></td><td>Client name for MQTT broker. It may be simply blank is most cases, unless specified by server.</td></tr><tr><td><strong>MQTT Publish Topic</strong></td><td>The MQTT topic to publish data to. In many cases, it will contain and API name and may include unique serial number of device or variable.</td></tr><tr><td><strong>MQTT Platform Name</strong></td><td>MQTT Platform Name: Generic platform name. It is for information or display purpose only. It is not used in communication.</td></tr></tbody></table>

{% hint style="info" %}
Depending on API and authentication mechanism in MQTT broker of IoT platform, some of entries may be blank.
{% endhint %}

Following is the example for MQTT integration with popular Tago.io IoT platform:

<figure><img src="/files/EP20gNEe3BrYVCMW1sIn" alt=""><figcaption></figcaption></figure>

### MQTT with SSL/TLS secure layer

YuDash IoT devices support SSL/TLS based secure communication. Please refer to [SSL/TLS for MQTT](/device-to-cloud-api/cloud-protocols/ssl-tls.md#enabling-ssl-tls-for-mqtt) documentation for enabling the security layer.