Android plugin in thread

Hi. I have problem with my game and I don’t know how to resolve it.

In my app I need to use android plugin for read something from USB. Plugin works great, but data from USB can come in anytime, so my app need to still checking it.

Initially I tried do something like that:

 IEnumerator readData(){
    		data = androidObject.Call<string> ("read");
    		yield return new WaitForSeconds(0.1f);

It works, but fps drops from 60 to 5 (I expected that).

Next idea were threads. My code:

AndroidJavaClass _MyActivityClass,_ActivityClass;
AndroidJavaObject androidObject;

private Thread ThreadRead;

void Start () {
	_ActivityClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
	_MyActivityClass = new AndroidJavaClass("com.example.permissiontest.MainActivity");
	androidObject = _ActivityClass.GetStatic<AndroidJavaObject>("currentActivity");

	ThreadRead = new Thread (readData);
	ThreadRead.Start ();

void readData(){
	data = androidObject.Call<string> ("read");	

That should start thread on the beggining and read once from android.
But whenever i use androidObject.Call in thread, my app crashes.
Do you have any other idea how to do that?

Ok I found other solution.

In Android I created new thread with whole read stuff and whenever it read something i use:

  UnityPlayer.UnitySendMessage("GameObjectName", "MethodName", "Message to send");

to send data to unity.