I know this post is old, but I want to let you know that the link will direct me to pisquare homepage.
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I assume the link has broken when migrating from the previous vCampus to today's PI Developers Club. Ahmad's post is mainly sharing the link.There are a lot of more recent discussions on the subject. For this reason, I was thinking about marking this post as outdated. There's a post with the same title, created on the same day and I believe this is where the link is supposed to go.