Very basic iOS application development is what we need, but connection with bluetooth low energy(ble) devices is also needed, so a company having experience with this should be chosen by us. Company should know what is gatt services, characteristics, read, write, notify etc. If you have an experience on ble devices, application development might be finished 2-3 days, it is basic. And detailed mock up work will be shared with the company.
We have major experience with Bluetooth LE - we have our own products - Clime (Bluetooth LE temperature/humidity/light sensors) and Woolet (wallet with bluetooth chip so you can't lose it) and also work with external clients.