You didn’t mention any details of what you have tried or the results… For example, do you have the BLE widget installed and connected to the module?
EDIT - sorry, just noticed the iOS bit 
as per the documents…
At the moment BLE widget supported only for Android
2nd EDIT - Well, based on some searching of this forum it looks like iOS should work with BLE, at least with some modules.
@Dmitriy do the documents need updating about this?