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When you register a site on Monitor My Watershed you can set it up with various sensor parameters, and once you’ve got all of them entered on the website, you click the “View Token UUID List” button at the top of your site page and you’ll get a list of all the UUIDs in the exact format and order in which you need to paste them into your sketch. If you’re not planning to transmit data to Monitor My Watershed or upload the file manually, then it’s okay to leave them as generic, non-unique UUIDs, but since you’ve got a unique registration token and sampling feature listed in your posted sketch, then I assume you’re intending to send data to MMW.