Release IOS app for only specified client group -

my team developing ios app used specified users customer of our hardware product(sensors being used in manufacturing).

can release app through normal apple app approval procedure , adopted app store? or apple disallow kind of app targeting specified customer group put in public app store? if can not put public store, method release app customers?

you allowed put on app store long doesn't use private apple api. if prefer not on app store, can enroll apple's ios enterprise developer program allows ad-hoc distribution (at costly price $$$).
recommended if app specific target group , outside of group, app's useless, better release internal app instead of on public app store.