Swift 3 - CBPeripheral.services nil problem

Question

Hi, I was trying to create an NUS (Nordic UART Service) application for iOS 10 devices using Swift 3. 
 I was testing with my 
 
 
 iPhone 6 Plus 64GB (iOS 10.2.1) 
 
 
 PCA10040 v1.1 that has NUS peripheral example from SDK 12.1 + S132 v3.0 
 
 
 ViewController.swift 
 As you see my attachment, I left a comment at the centralManager function. 
 When the centralManager function is called, the log screen printed Nordic_UART . 
 However, the services couldn't be printed because it was nil . 
 Are there extra configurations to set in order to get the services? 
 -Best Regards

Mostafa Berg · Accepted Answer

You are on the right track, but you are still missing the service and characteristic discovery steps. 
 When you connect to a peripheral, you should call discoverServices , and when you get the callback to didDiscoverServices , the services property of your CBPeripheral will be populated. 
 Afterwards, you should discover characteristics for each service using the discoverCharacteristics method, you will then get a callback to didDiscoverCharacteristics , at this point, your CBPeriphreal will include all the Services/Characteristics. without those steps, it'll all remain Nil . 
 Tips: You should specify the services you're interested in discovering, leaving this filter Nil will work, but is discouraged by Apple. 
 And here is the code that can walk you through how the nRFToolbox app does it

Swift 3 - CBPeripheral.services nil problem

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