title: iOS BLE Bluetooth - send/receive HEX data
body: <p>I am creating an iOS application that should connect to a custom BLE device. I need to iOS app to send 2 HEX commands, one to enable a part of the device and another to request for Data. </p>
  
  <p>Is there any way in iOS to send/receive custom HEX data, other than working with services &amp; characteristics?</p>