swift Bluetooth通信について

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
1import UIKit
2 import CoreBluetooth
3 
4 class BluetoothViewController: UIViewController, CBCentralManagerDelegate, CBPeripheralManagerDelegate, UITextFieldDelegate, CBPeripheralDelegate {
5 
6 var centralManager: CBCentralManager!
7 var peripheral: CBPeripheral!
8 var peripheralManager: CBPeripheralManager!
9 var textFieldString = ""
10 
11 @IBOutlet weak var messageField: UITextField!
12 @IBOutlet weak var messageView: UITextView!
13 
14 override func viewDidLoad() {
15 super.viewDidLoad()
16 // Do any additional setup after loading the view.
17 
18 centralManager = CBCentralManager(delegate: self, queue: nil)
19 peripheralManager = CBPeripheralManager(delegate: self, queue: nil)
20 }
21 
22 override func didReceiveMemoryWarning() {
23 super.didReceiveMemoryWarning()
24 // Dispose of any resources that can be recreated.
25 }
26 
27 override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
28 view.endEditing(true)
29 }
30 
31 //  接続状況が変わるたびに呼ばれる
32 func centralManagerDidUpdateState(_ central: CBCentralManager) {
33 print ("state: (central.state)")
34 }
35 
36 //  スキャン開始
37 @IBAction func startScan(_ sender: Any) {
38 //  2.3
39 //  centralManager.scanForPeripheralsWithServices(nil, options: nil)
40 centralManager.scanForPeripherals(withServices: nil, options: nil)
41 print("スキャン開始")
42 }
43 
44 //  スキャン結果を取得
45 func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
46 self.peripheral = peripheral
47 self.centralManager.connect(self.peripheral, options: nil)
48 }
49 
50 //  スキャン終了
51 @IBAction func stopScan(_ sender: Any) {
52 centralManager.stopScan()
53 print("スキャン終了")
54 }
55 
56 //  接続成功時に呼ばれる
57 func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
58 print("Connect success!")
59 }
60 
61 //  接続失敗時に呼ばれる
62 func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
63 print("Connect failed...")
64 }
65 
66 @IBAction func sendMessage(_ sender: Any) {
67 
68 textFieldString = messageField.text!
69 messageView.text = textFieldString
70 
71 }
72 
73 func textFieldShouldReturn(_ textField: UITextField) -> Bool {
74 messageField.resignFirstResponder()
75 return true
76 }
77 
78 //  ペリフェラルのStatusが変化した時に呼ばれる
79 func peripheralManagerDidUpdateState(_ peripheral: CBPeripheralManager) {
80 print("periState(peripheral.state)")
81 }
82 
83 @IBAction func startAdvertite(_ sender: Any) {
84 let advertisementData = [CBAdvertisementDataLocalNameKey: "Test Device"]
85 let serviceUUID = CBUUID(string: "0000")
86 let service = CBMutableService(type: serviceUUID, primary: true)
87 let charactericUUID = CBUUID(string: "0001")
88 let characteristic = CBMutableCharacteristic(type: charactericUUID, properties: CBCharacteristicProperties.read, value: nil, permissions: CBAttributePermissions.readable)
89 service.characteristics = [characteristic]
90 self.peripheralManager.add(service)
91 peripheralManager.startAdvertising(advertisementData)
92 }
93 
94 //  サービス追加結果の取得
95 func peripheralManager(_ peripheral: CBPeripheralManager, didAdd service: CBService, error: Error?) {
96 if error != nil {
97 print("Service Add Failed...")
98 return
99 }
100 print("Service Add Sucsess!")
101 }
102 
103 //  アドバタイズ開始処理の結果を取得
104 func peripheralManagerDidStartAdvertising(_ peripheral: CBPeripheralManager, error: Error?) {
105 if let error = error {
106 print("***Advertising ERROR")
107 return
108 }
109 print("Advertising success")
110 }
111 
112 //  アドバタイズ終了
113 @IBAction func topArvertisement(_ sender: Any) {
114 peripheralManager.stopAdvertising()
115 print("アドバタイズ終了")
116 }
117 
118 //  service検索開始
119 @IBAction func getService(_ sender: Any) {
120 peripheral.delegate = self
121 peripheral.discoverServices(nil)
122 }
123 
124 //  service検索結果取得
125 func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
126 guard let services = peripheral.services else{
127 print("error")
128 return
129 }
130 print("(services.count)個のサービスを発見。(services)")
131 
132 //  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
133 for obj in services {
134 peripheral.discoverCharacteristics(nil, for: obj)
135 }
136 }
137 
138 //  キャラクタリスティック検索結果取得
139 func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
140 if let characteristics = service.characteristics {
141 print("(characteristics.count)個のキャラクタリスティックを発見。(characteristics)")
142 }
143 }
144 
145 /*
146 // MARK: - Navigation
147 
148 // In a storyboard-based application, you will often want to do a little preparation before navigation
149 override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
150 // Get the new view controller using segue.destinationViewController.
151 // Pass the selected object to the new view controller.
152 }
153 */
154 
155 }