Connectivity problem on Android App [Java SDK]

Hello, 

Recently, I had a Java app made with the PTC Java SDK (JAVA-SDK-6-2-0-220). I used the SimpleClient provided by PTC, and I successed to interract with the server.

Later I move this code to an Android App, with the same PTC Java SDK, and I can't connect. Here are the versions i tried : 

Version Android : API 30: Android 11
Version Java JDK (from Android Studio) : 11.0.8
Version SDK PTC Thingworx : JAVA-SDK-6-2-0-220
result : failure

Version d'Android : API 29: Android 10
Version Java JDK (from Android Studio) : 11.0.8
Version SDK PTC Thingworx : JAVA-SDK-6-2-0-220
result : failure

The exact same code is working well on Java with Eclipse (still same ptc java sdk)

Here are the authorization i requierd. I don't prompt the user to accept it, as i think the 3 first doesn't require user aprobation. The 2 I'm not even sure I need them. 

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
// To fix EACCES error (this had not fixed the issue)
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

Here is my code (simplified)

The trace is in the file attached.

public class SimpleClient extends ConnectedThingClient {

 private static final Logger LOG = LoggerFactory.getLogger(SimpleClient.class);

 private static String ThingName = "AndroidTestThing";

 public SimpleClient(ClientConfigurator config) throws Exception {
 super(config);
 }

 public static void notifyServer() {

 ClientConfigurator config = new ClientConfigurator();

 config.setUri("wss://xxxxxxxxxxxxxxxx:443/Thingworx/WS");
 config.setAppKey("xxxxxxxxxxxxxxxxxxxxxxxxxx");
 config.ignoreSSLErrors(true);

 try {
 SimpleClient client = new SimpleClient(config);

 client.start();

 // Wait for the client to connect.
 if (client.waitForConnection(30000)) {
 LOG.info("The client is now connected.");
 } else {
 LOG.warn("Client did not connect within 30 seconds. Exiting");
 }

 client.shutdown();

 } catch (Exception e) {
 LOG.error("An exception occurred while initializing the client", e);
 } finally {
 LOG.info("SimpleClient is done. Exiting");
 }
 }
}