Hi all. I'm a hobby tinkerer, and I'd like my Arduino to read from an existing iPhone app which reads and displays continuous blood glucose level numbers every minute. When the value reaches below a certain threshold, the Arduino circuit would perform an action, such as rotating a motor. Creating the circuit and coding the electronic components is no problem for me, but I'm struggling to understand how to interface with the app if I did not create the app. I know you can create your own app and have your Arduino interface with that using an ESP8266. But is interfacing with an app that I didn't create even possible? Is there a better way of doing this? The app also gives notifications for when the value reaches below a certain threshold. Perhaps there's a way to make my circuit respond to a notification from that app? Thanks for your input!
Your problem is not really arduino related. If that app doesn't make any external communication, it's hard to get trigger on arduino.
I have never used iphone, but maybe you can build an app that can read notifications and then communicate with Esp.
That is not possible. Where you may have some luck is looking at the actual device doing the measuring. Inserting code between the device and the iPhone app (like a T) is one approach. Another is the classic 'man in the middle' whereby the device is made to talk to your code and you pass it along to the original recipient while also doing your own thing. ALL those ideas require access to a piece of hardware you have not told us anything useful about. If you can do that, then you may get better advice.
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