Bluetooth Didconnect or Didfailtoconnect Not Called Xcode 9.2 with iOS 11.1.2

Bluetooth Peripheral Stuck in Connecting State On iOS

You don't want that while loop; This will just block the Core Bluetooth delegate thread. After issuing the connect you will get a call to the didConnect CBCentralManagerDelegate method. Once the peripheral is connected you need to call discoverServices on the peripheral, which will give a callback to the peripheral:didDiscoverServices: peripheral delegate method. You can then discover the characteristics in a similar way.

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
// get advertisement data and check to make sure the name is matching. set it as the peripheral then make connection
    if let peripheralName = advertisementData[CBAdvertisementDataLocalNameKey] as? String {
        print("NEXT PERIPHERAL NAME: \(peripheralName)")
        print("NEXT PERIPHERAL UUID: \(peripheral.identifier.uuidString)")

        if peripheralName == nameID {
            self.peripheralHalo = peripheral
            central.stopScan()
            central.connect(peripheral, options: nil)
        }
    }
}

func centralManager(_ central: CBCentralManager, 
              didConnect peripheral: CBPeripheral) {
    print("Connected!!")
    peripheralHalo!.delegate = self
    peripheral.discoverServices([serviceID)
}

Also, if you are going to store something that identifies which peripheral you want to connect to, I suggest you use the identifier and not the name as the name can change.

MySQL query: work out the average rating for each user then order the results by average rating and number of ratings

If you group and count, you need having:

SELECT username, (SUM(rating)/COUNT(*)) as TheAverage, Count(*) as TheCount
    FROM rating
    WHERE month='Aug'
    GROUP BY username
    HAVING TheCount > 1
    ORDER BY TheAverage DESC, TheCount DESC

How to delete file after end of streaming wcf

I found great solution in this blog if someone will need it in the future

OperationContext clientContext = OperationContext.Current;
clientContext.OperationCompleted += new EventHandler(delegate(object sender, EventArgs args)
   {
      if (fileStream != null)
         fileStream.Dispose();
   });

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