> For the complete documentation index, see [llms.txt](https://cocolinx.gitbook.io/cocolinx-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cocolinx.gitbook.io/cocolinx-docs/home/english/development/echo-server-user-guide.md).

# Echo Server | User Guide

The CocoLinx Echo Server is a test server that allows you to quickly verify the network connectivity of LTE and IoT devices.

You can test UDP, TCP, and MQTT communication using the `echo.cocolinx.com` domain without building a separate server.

{% hint style="info" %}
The Echo Server is provided for product development and communication testing purposes. It is not recommended for production services.
{% endhint %}

## Server Information

<table><thead><tr><th width="212.6668701171875">Protocol</th><th width="399.22216796875">Domain</th><th>Port</th></tr></thead><tbody><tr><td>UDP</td><td>echo.cocolinx.com</td><td>7777</td></tr><tr><td>TCP</td><td>echo.cocolinx.com</td><td>7777</td></tr><tr><td>MQTT</td><td>echo.cocolinx.com</td><td>1883</td></tr><tr><td>MQTT TLS</td><td>echo.cocolinx.com</td><td>8883</td></tr></tbody></table>

## Examples and Guides

Sample code for UDP, TCP, and MQTT communication is available in the CocoLinx GitHub repository.

For MQTT over TLS configuration, refer to the MQTT TLS guide.