# 呼吸綁帶 (或是任何要接藍芽的碗糕) 修正
###### tags: `lab`

:::success
兼容原本 (PC) 版本，請安心服用
:::

:::info
對於實驗室在開發新專案的同學：請使用 [LabFrame2023](https://hackmd.io/@jcxyisncu1102/labframe2023)
:::

## 操作說明
- 先在 pico 裡面設定把設備跟 pico 配對 (藍芽)
- 如果有 PIN，請看 [底下](#Pico-VR-不支援配對有-PIN-碼的裝置)
- (設備名稱要叫做 `HC-05` 或 `HC-06`，不然要改下面的 `SensorController.cs` (見第 56 行))
- 然後就可以開始改了

## 匯入外掛包
- [下載這個 jar 檔](https://drive.google.com/file/d/1P-x8JDkoeCKMrd_1cu59VzHtF6frzvtR/view?usp=sharing)
- 放在 `Plugins/Android/libs` 底下

## 更改 AndroidManifest.xml
檢查有沒有以下三行 (善用 `ctrl+F`)

  <uses-permission android:name="android.permission.BLUETOOTH" />
  <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
  <uses-permission android:name="android.permission.BLUETOOTH_PRIVILEGED" />

## 新增 BluetoothService.cs
- **新寫的腳本**
- 負責與外掛包呼叫

// from https://github.com/bentalebahmed/BlueUnity
// Modded by JCxYIS 20220331

using System;
using UnityEngine;


public class BluetoothService
{
    private static bool isInited = false;
    private static AndroidJavaClass unityPlayer;
    private static AndroidJavaObject activity;
    private static AndroidJavaObject context;
    private static AndroidJavaClass unity3dbluetoothplugin;
    private static AndroidJavaObject BluetoothConnector;


    // creating an instance of the bluetooth class from the plugin 
    public static void CreateBluetoothObject()
    {
        if (Application.platform == RuntimePlatform.Android && !isInited)
        {
            unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
            activity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
            context = activity.Call<AndroidJavaObject>("getApplicationContext");
            unity3dbluetoothplugin = new AndroidJavaClass("com.example.unity3dbluetoothplugin.BluetoothConnector");
            BluetoothConnector = unity3dbluetoothplugin.CallStatic<AndroidJavaObject>("getInstance");
            isInited = true;
        }
    }

    // starting bluetooth connection with device named "DeviceName"
    // print the status on the screen using native android Toast
    public static bool StartBluetoothConnection(string DeviceName)
    {
        if (Application.platform == RuntimePlatform.Android)
        {
            string connectionStatus = "non";
            try
            {
                connectionStatus = BluetoothConnector.Call<string>("StartBluetoothConnection", DeviceName);
                Toast(connectionStatus);
                if (connectionStatus == "Connected") return true;
                else return false;
            }
            catch (Exception e)
            {
                Toast(connectionStatus);
                return false;
            }
        }
        else return false;
    }

    // should be called inside OnApplicationQuit
    // stop connection with the bluetooth device
    public static void StopBluetoothConnection()
    {

        if (Application.platform == RuntimePlatform.Android)
        {
            try
            {
                BluetoothConnector.Call("StopBluetoothConnection");
                Toast("connction stoped");
            }
            catch (Exception e)
            {
                Toast("stop connction error");
            }
        }
    }

    // write data as a string to the bluetooth device
    public static void WritetoBluetooth(string data)
    {
        if (Application.platform == RuntimePlatform.Android)
        {
            try
            {
                BluetoothConnector.Call("WriteData", data);
            }
            catch (Exception e)
            {
                Toast("write data error");
            }
        }
    }


    //read data from the bluetooth device
    // if there is an error or there is no data coming, this method will return "" as an output
    public static string ReadFromBluetooth()
    {
        string data = "";
        if (Application.platform == RuntimePlatform.Android)
        {
            try
            {
                data = BluetoothConnector.Call<string>("ReadData");
                return data;
            }
            catch (Exception e)
            {
                // Toast("read data error");
                return "";
            }
        }
        else return "";
    }

    public static void Toast(object log)
    {
        BluetoothConnector.Call("PrintOnScreen", context, log.ToString());
    }
}

## 改實驗室框架/模組

### SensorController.cs
- 我覺得我拿到的這個 script 已經有被改過了
- 請自己複製關鍵的 code 去用ㄅ

/// Mooded by JCxYIS
/// 20220331


using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System;
using System.Threading;
using UnityEngine.SceneManagement;
using LabData;
using System.Globalization;

#if UNITY_STANDALONE_WIN
using System.IO.Ports;
#endif

// 掛在場景中的GameObject(我取名叫BreathSensor)身上
public class SensorController : MonoBehaviour, IDisposable
{
#if UNITY_STANDALONE_WIN
    private SerialPort stream = null; 
#endif
    private string val = null;
    private string sArray = "";
    private string sArr = "";
    private Thread myThread;
    private float currentPressure;
    private float breathVal = 0.0f;
    private float breathTotal = 0.0f;
    private int numOfVal = 0;

    // Use this for initialization
    public IEnumerator ConnectionInit (string ComNum) {
        //if (LabTools.GetConfig<ApplicationConfig>().BlueTooth)
        //{
        //}
        Debug.Log("連接初始化");
        bool isConnected = false;
        while(!isConnected) //重複開啟serial port接口直到連線成功為止
        {
            try
            {
                Debug.Log("連接中... com="+ComNum);
#if UNITY_STANDALONE_WIN
                stream = new SerialPort("COM" + ComNum, 9600);//呼吸 9600 舌壓 12800 
                stream.Open(); //開啟serial port接口，才能收資料
                isConnected = true;
#elif UNITY_ANDROID && !UNITY_EDITOR
                BluetoothService.CreateBluetoothObject();
                if( BluetoothService.StartBluetoothConnection("HC-05") ||
                    BluetoothService.StartBluetoothConnection("HC-06"))
                {
                    isConnected = true;
                }
#else
                Debug.LogError("I can't breathe");
                yield break;
#endif
            }
            catch (Exception e)
            {
                Debug.Log("Reconnect... Reason="+e);
            }
            yield return 0;
        }
        Debug.Log("已連接！ Sensor Connected");
        myThread = new Thread(new ThreadStart(GetArduino)); //物件宣告及呼叫GetArduino
        myThread.Start(); //這邊用thread
    }
    
    void Update(){
        //float.TryParse (val, out m);
        if(val != null)
        {
            sArray = val; //舌壓
            //Debug.Log(sArray);
            if (sArray != "Pressure:")
            {
                sArr = sArray;
                Debug.LogError("呼吸綁帶數值: " + sArr);

                if(TestGameFrame.Test_EnemyTask._isCalBreathStart)
                {  
                    if(float.TryParse(sArr, out float f))
                    {
                        // boundry check
                        if(f < 900 || f > 1100)
                            break;
                        // 取得呼吸綁帶數值 給breathVal, 儲存在breathArr裡
                        breathVal = f;
                        breathTotal += breathVal;
                        numOfVal++;
                    }
                    else
                    {
                        Debug.LogWarning("[Sensor] 無法解析呼吸綁帶數值="+sArr);
                    }
                }                
            }
        }

    // Get Arduino ANDROID ver :P
    #if UNITY_ANDROID && !UNITY_EDITOR
        try
        {
            string inVal = BluetoothService.ReadFromBluetooth();
            if(inVal.Length > 0)
            {
                val = inVal;
                // Debug.Log("[Sensor_Android] "+val);
            }
        }
        catch(Exception e)
        {
            Debug.LogWarning("[Sensor_Android] "+e);
        }
    #endif
    }

    public string getBreathStr()
    {
        return sArr;
    }  

    public float getBreathVal()
    {
        return breathVal;
    }  

    
    public double getBaseline()
    {
        double baseline = 0.0f;
        baseline = breathTotal / numOfVal;
        return baseline;
    }

    public double getThreshold()
    {
        double baseline = 0.0f;
        double threshold = 0.0f;

        // 算這些值的平均
        baseline = breathTotal / numOfVal;
        // 平均加一個數值等於門檻值
        threshold = baseline + 5;
        return threshold;
    }

    private void GetArduino()
    {
#if UNITY_STANDALONE
        //Debug.Log(stream.IsOpen);
        while(myThread.IsAlive && stream.IsOpen)
        {
            //Debug.Log("進入完成");
            val = stream.ReadLine();
            //Debug.Log(val);
        }
#elif UNITY_ANDROID 
       // fetch data in Update()
#endif
    }

    //關閉thread&serial port，否則會死當
    void OnDisable()
    {
        Dispose();
    }
    void OnApplicationQuit()
    {
        Dispose();
    }

    public void Dispose()
    {
#if UNITY_STANDALONE
        if (stream != null)
        {
            stream.Close();
            myThread.Abort();
        }
#elif UNITY_ANDROID
        BluetoothService.StopBluetoothConnection();
#endif
    }
}

### 呼吸綁帶 Init 的地方 (我的在 Test_EnemyTask.cs)

            #region 呼吸綁帶
            if(string.IsNullOrEmpty(GameDataManager.FlowData.BreathCOM))
            {
                Debug.LogWarning("略過呼吸綁帶綁定");
            }
            else
            {
                sensorObject = GameObject.Find("BreathSensor");
                print("呼吸綁帶 GO => "+sensorObject);
// #if UNITY_STANDALONE
                yield return sensorObject.GetComponent<SensorController>().ConnectionInit(GameDataManager.FlowData.BreathCOM);
// #endif
            }
            #endregion

## Troubleshoot

### Pico VR 不支援配對有 PIN 碼的裝置

先使用這個 app 來連接吧
https://github.com/JCxYIS/PicoXR-BluetoothConnector/releases

- 安裝 app
- 進入 app，按 Scan Devices
- 找到想連接的裝置 *(e.g. 呼吸綁帶是 HC-05 or HC-06)*
- **先**輸入右下角的 PIN 碼 *(e.g. 呼吸綁帶是 1234)*
- 再按裝置旁邊的 Connect
- You're done! 裝置只需綁定一次，之後可直接連線不需要再綁。

如果設備不支援配對也可以嘗試使用這專案的程式碼來連。

### 呼吸綁帶功能無法使用時的防錯方案
在取用呼吸數值 (我的放在 Test_EnemyTask 的`IEnumerator BreathCtrlBalloon(GameObject balloon)` ) 函式中如果不傳入 sensorObject 會炸掉，所以要加

            ...
            while (!_isBreathFinish && !_isRebreathButtonClick)
            {
                if(!sensorObject)
                {
                    Debug.LogWarning("不使用呼吸綁帶無法計算呼吸");                    
                    yield return 0;
                    continue;
                }
                ...

###### References
https://github.com/bentalebahmed/BlueUnity