Sorry, to get back to your original question, @sam_uk, I don’t think there’s been a lot of development here, but perhaps @paul121 would know better.
A major hurdle at this point is the reliance on native API’s, because NFC is not yet available through web browsers. We have experimented with these API’s via Cordova, which gives us access to the native API’s but at considerable cost. We’ve decided, at least for the time being, to direct our focus towards the progressive web app (PWA) for Field Kit, rather than the native iOS and Android releases. More info on that here: