CBAdvertisementDataTxPowerLevelKey cannot be set when advertising.

 

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Code Block Swift
var advertisingData = [String : Any]()
      if let message = self.message {
        advertisingData[CBAdvertisementDataLocalNameKey] = message
      }
      advertisingData[CBAdvertisementDataTxPowerLevelKey] = NSNumber(value: 1)
       
      if let peripheralManager = self.peripheralManager {
        peripheralManager.startAdvertising(advertisingData)
        }
      }