$ composer require mediumart/echo.io-php
Add the service provider, in config/app.php, to the providers array (only need for laravel versions prior to 5.5)
Mediumart\Echoio\EchoioServiceProvider::class,Then add a secret key for broadcasting, to config/services.php
'broadcast' => [
'key' => '<your_secret_key_here>',
],this can be any random string for now, but the exact same secret key should be configured on the echo.io nodejs server side.