Just in case you think about developing an IOS app for Tello: Forget it!
You are at the mercy of some clowns doing an app review. They recently started to interpret their review guideline 5.2.1 in a way that the use of an external device automatically implies a copyright infringement if you don't include an explicit authorization:
Guideline 5.2.1 - Legal - Intellectual Property
Your app includes content or features from Tello, or is marketed to control external hardware from Tello, without the necessary authorization. The inclusion of third-party content within your app, whether retrieved from the internet by the app or embedded in the app, is subject to the terms of the Apple Developer Program License Agreement.
Your app and its contents should not infringe upon the rights of another party. In the event your app infringes another party’s rights, you are responsible for any liability to Apple because of a claim.
Next Steps
To resolve this issue, please attach documentary evidence in the App Review Information section in App Store Connect.
Of course the published version of Apple's guideline 5.2.1 does not mention external devices at all.
Apple insists on this authorization and Ryze ignores requests for authorization. So my nice new app is just a load of useless bits & bytes.
(Yes, there are some apps in the store. Some have been released before they started to apply this modified 5.2.1, and others were simply lucky and their reviewer did not know the guide or did not care)
You are at the mercy of some clowns doing an app review. They recently started to interpret their review guideline 5.2.1 in a way that the use of an external device automatically implies a copyright infringement if you don't include an explicit authorization:
Guideline 5.2.1 - Legal - Intellectual Property
Your app includes content or features from Tello, or is marketed to control external hardware from Tello, without the necessary authorization. The inclusion of third-party content within your app, whether retrieved from the internet by the app or embedded in the app, is subject to the terms of the Apple Developer Program License Agreement.
Your app and its contents should not infringe upon the rights of another party. In the event your app infringes another party’s rights, you are responsible for any liability to Apple because of a claim.
Next Steps
To resolve this issue, please attach documentary evidence in the App Review Information section in App Store Connect.
Of course the published version of Apple's guideline 5.2.1 does not mention external devices at all.

Apple insists on this authorization and Ryze ignores requests for authorization. So my nice new app is just a load of useless bits & bytes.
(Yes, there are some apps in the store. Some have been released before they started to apply this modified 5.2.1, and others were simply lucky and their reviewer did not know the guide or did not care)
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