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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
shameless plug I happen to have work on this before on my library and I totally understand how limited the documentation can be. mDNS is your best option here and its not too complicated. You're going to need this: https://github.com/balthazar/react-native-zeroconf
shameless plug I happen to have work on this before on my library and I totally understand how limited the documentation can be. mDNS is your best option here and its not too complicated. You're going to need this: https://github.com/balthazar/react-native-zeroconf