how to update BLE device name in ios swift !

Question

I would like to update ble device name from device1 to user2.
How i can do this in swift language . i m atrung to update by ios app. 
 is below way is right? but not able to update 
 let hexData = "user2"?.dataFromHexString() 
 peripheral.writeValue(data, forCharacteristic: characteric, type: CBCharacteristicWriteType.WithResponse)

Vijyendra · Accepted Answer

Thanks All, 
 Successfully updated device name, aplha value and date on ble device...just was missing sequence :( 
 Below is the code: for future reference 
 @IBAction func updateDevicePressed(){ 
 self.showActivityView()
 self.updateButton.isEnabled = false
 
 DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
 self.updateRegistrationNumber()
 }
}

func updateRegistrationNumber(){
 
 let hexValReg = deviceName.unicodeScalars.filter { $0.isASCII }.map { String(format: "%X", $0.value) }.joined()
 print(hexValReg)
 let regData = self.dataWithHexString(hex: hexValReg)// 50756E65 pune
 
 deviceNameCharacterToUpdate?.service.peripheral.writeValue(regData as Data, for: deviceNameCharacterToUpdate!, type: CBCharacteristicWriteType.withResponse)
 
 DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
 self.updateLocation()
 } 
}

func updateLocation(){
 
 let hex = location.unicodeScalars.filter { $0.isASCII }.map { String(format: "%X", $0.value) }.joined()
 let dataLoca = self.dataWithHexString(hex: hex)

 locationCharacterToUpdate?.service.peripheral.writeValue(dataLoca as Data, for: locationCharacterToUpdate!, type: CBCharacteristicWriteType.withResponse)
 
 DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
 self.updateExpireDate()
 }
}

func updateExpireDate(){
 
 let data = self.dataWithHexString(hex: hexDateToWrite)// 5976C3A3
 dateCharacterToUpdate?.service.peripheral.writeValue(data, for: dateCharacterToUpdate!, type: CBCharacteristicWriteType.withResponse)

 self.updateButton.isEnabled = true
 self.hideActivityView()

}

how to update BLE device name in ios swift !

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