常連

Bluetooth通信の勉強がしたい為、Qiitaであったサンプルアプリを試してみたのですが、textfieldに入力した文字をボタンを押したらもう一つの端末のTextViewに表示させたいのですがうまくいきません。
どうすれば表示できるようになるのでしょうか？
初心者なもので、何卒力添えを...

参考にしたQiitaのリンク
https://qiita.com/nave421m/items/639a7a043844acda4eff

```swift
import UIKit
 import CoreBluetooth
 
 class BluetoothViewController: UIViewController, CBCentralManagerDelegate, CBPeripheralManagerDelegate, UITextFieldDelegate, CBPeripheralDelegate {
 
 var centralManager: CBCentralManager!
 var peripheral: CBPeripheral!
 var peripheralManager: CBPeripheralManager!
 var textFieldString = ""
 
 @IBOutlet weak var messageField: UITextField!
 @IBOutlet weak var messageView: UITextView!
 
 override func viewDidLoad() {
 super.viewDidLoad()
 // Do any additional setup after loading the view.
 
 centralManager = CBCentralManager(delegate: self, queue: nil)
 peripheralManager = CBPeripheralManager(delegate: self, queue: nil)
 }
 
 override func didReceiveMemoryWarning() {
 super.didReceiveMemoryWarning()
 // Dispose of any resources that can be recreated.
 }
 
 override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
 view.endEditing(true)
 }
 
 //  接続状況が変わるたびに呼ばれる
 func centralManagerDidUpdateState(_ central: CBCentralManager) {
 print ("state: (central.state)")
 }
 
 //  スキャン開始
 @IBAction func startScan(_ sender: Any) {
 //  2.3
 //  centralManager.scanForPeripheralsWithServices(nil, options: nil)
 centralManager.scanForPeripherals(withServices: nil, options: nil)
 print("スキャン開始")
 }
 
 //  スキャン結果を取得
 func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
 self.peripheral = peripheral
 self.centralManager.connect(self.peripheral, options: nil)
 }
 
 //  スキャン終了
 @IBAction func stopScan(_ sender: Any) {
 centralManager.stopScan()
 print("スキャン終了")
 }
 
 //  接続成功時に呼ばれる
 func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
 print("Connect success!")
 }
 
 //  接続失敗時に呼ばれる
 func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
 print("Connect failed...")
 }
 
 @IBAction func sendMessage(_ sender: Any) {
 
 textFieldString = messageField.text!
 messageView.text = textFieldString
 
 }
 
 func textFieldShouldReturn(_ textField: UITextField) -> Bool {
 messageField.resignFirstResponder()
 return true
 }
 
 //  ペリフェラルのStatusが変化した時に呼ばれる
 func peripheralManagerDidUpdateState(_ peripheral: CBPeripheralManager) {
 print("periState(peripheral.state)")
 }
 
 @IBAction func startAdvertite(_ sender: Any) {
 let advertisementData = [CBAdvertisementDataLocalNameKey: "Test Device"]
 let serviceUUID = CBUUID(string: "0000")
 let service = CBMutableService(type: serviceUUID, primary: true)
 let charactericUUID = CBUUID(string: "0001")
 let characteristic = CBMutableCharacteristic(type: charactericUUID, properties: CBCharacteristicProperties.read, value: nil, permissions: CBAttributePermissions.readable)
 service.characteristics = [characteristic]
 self.peripheralManager.add(service)
 peripheralManager.startAdvertising(advertisementData)
 }
 
 //  サービス追加結果の取得
 func peripheralManager(_ peripheral: CBPeripheralManager, didAdd service: CBService, error: Error?) {
 if error != nil {
 print("Service Add Failed...")
 return
 }
 print("Service Add Sucsess!")
 }
 
 //  アドバタイズ開始処理の結果を取得
 func peripheralManagerDidStartAdvertising(_ peripheral: CBPeripheralManager, error: Error?) {
 if let error = error {
 print("***Advertising ERROR")
 return
 }
 print("Advertising success")
 }
 
 //  アドバタイズ終了
 @IBAction func topArvertisement(_ sender: Any) {
 peripheralManager.stopAdvertising()
 print("アドバタイズ終了")
 }
 
 //  service検索開始
 @IBAction func getService(_ sender: Any) {
 peripheral.delegate = self
 peripheral.discoverServices(nil)
 }
 
 //  service検索結果取得
 func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
 guard let services = peripheral.services else{
 print("error")
 return
 }
 print("(services.count)個のサービスを発見。(services)")
 
 //  サービスを見つけたらすぐにキャラクタリスティックを取得
 for obj in services {
 peripheral.discoverCharacteristics(nil, for: obj)
 }
 }
 
 //  キャラクタリスティック検索結果取得
 func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
 if let characteristics = service.characteristics {
 print("(characteristics.count)個のキャラクタリスティックを発見。(characteristics)")
 }
 }
 
 /*
 // MARK: - Navigation
 
 // In a storyboard-based application, you will often want to do a little preparation before navigation
 override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
 // Get the new view controller using segue.destinationViewController.
 // Pass the selected object to the new view controller.
 }
 */
 
 }
```

質問編集履歴