I'm aware of this issue and have a fix lined up for the next version of the app. The plan is to use a simple script to get the public IP and display it. I'm planning to release the next version shortly.
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Here's a blog post for how you can create your own source type : http://amiracle19.blogspot.com/2016/02/adding-dd-wrt-sourcetype.html
Let me know if this answers your question.
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