Redis Status: Not Installed

I use roots.io/bedrock and am trying to get object caching to work. I have redis installed and the following works fine:

<?php
   //Connecting to Redis server on localhost
   $redis = new Redis();
   $redis->connect('127.0.0.1', 6379);
   echo "Connection to server sucessfully";
   //check whether server is running or not
   echo "Server is running: "+ $redis->ping();
?>

I can see the ping through redis-cli monitor

Unfortunately, using your plugin, it shows that Redis is not installed (using the same 127.0.0.1/6379).

I also get the following:
Notice: Undefined property: WP_Object_Cache::$redis_client in /srv/http/site/web/wp/wp-includes/cache.php on line 327

https://wordpress.org/plugins/redis-cache/