I am not able to figure out, how to set the right camera resolution in iOS. I get the following log:
018-08-19 12:55:26.443408+0200 helloar[4436:1828117] [info] No predefined camera parameters for device iPhone (Unknown model).
2018-08-19 12:55:26.443492+0200 helloar[4436:1828117] [info] Fetching external camera parameters.
2018-08-19 12:55:26.443599+0200 helloar[4436:1828301] [info] cparamSearch beginning search for apple/iPhone/iPhone10,4, camera 0, aspect ratio 4:3.
...
2018-08-19 12:55:27.678098+0200 helloar[4436:1828301] [warning] Using default camera parameters for 480x360 image size, 45 degrees vertical field-of-view.