This won't take long.
If you email us or add your email to the mailing list, then we will have your email address and whatever you type in the email. But that's on you really. We will only use the mailinglist email address to email you very rare updates. So far we've never sent one, but would like to if we could ever use your help to get Candle to the next level.
We use Mozilla's WebThings Gateway as the basis for the Candle Controller. It's basically a standard installation of the WebThings Gateway with some of our add-ons (Candle Manager, MySensors, optionally Voco) on top to enable our features.
We do not collect any data from the add-ons.
But you should realise that Candle uses infrastructure to host code and files, and the owners of those platforms could theoretically track you. You'll have to look at the privacy policies of these organisations:
Know your rights
As a European you have the right to have your data removed or modified. If you would like us to delete your email address, don't hesitate to ask us. You'll have to send an email (of the irony), but that will then also be removed.