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Since I’m not familiar with iOS devices, all I know is that the last time I researched the issue, iOS doesn’t officially allow direct connection of serial (or TTL) accessories to Apple devices through the lightning port, plus there are no official apps in the App store even if you could buy a cable. There are some unofficial interface cables that some companies have made that may or may not work with a device like the Mayfly, and you supposedly would then have to use software to create your own app to actually handle the data. So in the end, everyone who has asked me about this issue with a Mayfly ended up just using an Android device and an FTDI cable. (just be sure the FTDI cable or board is based on the FT232 chip and not a CP2102, for the reason mentioned above).
Since reading live data in the field directly on the Mayfly board can be very helpful sometimes, I developed this small OLED display a couple years ago: https://www.envirodiy.org/product/envirodiy-oled-half-shield-pack-of-5/ It works great with basic sketches, and can be switched on and off in the code to save power (like having the Mayfly’s onboard light sensor automatically sense the light levels and only activate the display when the enclosure lid is open, or when someone presses a button). We’re still working to incorporate it into the existing ModularSensors logging sketches that are usually used in our full deployments, but it could eliminate the need for phone interfaces for some users.