Get data from iOS

So the Bangle is getting the relevant notification sent to it, and you want to be able to grab the data out of it?

If so, absolutely! The ios app sends the message event to the messages library at https://github.com/espruino/BangleApps/blob/master/apps/ios/boot.js#L165 but the messages library sends a message event, so if you had an app with that did:

Bangle.on("message", function(type, msg) {
  if (msg.src.toLowerCase().includes("weather")) {
    ....do stuff here
    msg.handled = true; // stop us loading the messages app or buzzing
  }
});

That should work great for you