The purpose of this plugin is to hide the standard login form of Redmine. This plugin can be useful if your redmine goes Internet without a reverse proxy and you want to keep the login process on Redmine.
ThingSpeak is an open source “Internet of Things” application and API to store and retrieve data from things using HTTP over the Internet or via a Local Area Network. With ThingSpeak, you can create sensor logging applications, location tracking applications, and a social network of things with status updates.