[saagarjha]

I don’t think there is any public API for this: you probably have to be in the MFI program to send data through the Lightning port.

[Maxious]

"iOS app developers do not need to join the MFi Program. Everything app developers need is in the External Accessory Framework" https://developer.apple.com/documentation/externalaccessory/...

Technically there is a serial cable you can buy for hobbyist/personal/internal use but "Under current Apple policy this cable may not be used with apps sold on the App Store." https://redpark.myshopify.com/products/serial-cable-l2-db9v

[saagarjha]

I thought the hardware manufacturer needed to get MFI approval allow for developers to distribute apps that rely on ExternalAccessory?