greatly improved application stability when connecting to a Wi-Fi direct server

app/src/main/java/com/faraphel/tasks_valider/ui/screen/communication/authentication/client.kt

@@ -25,6 +25,7 @@ import com.faraphel.tasks_valider.database.entities.error.HttpException
 import com.faraphel.tasks_valider.ui.screen.scan.qr.ScanBarcodeScreen
 import com.journeyapps.barcodescanner.BarcodeResult
 import okhttp3.HttpUrl.Companion.toHttpUrl
+import java.net.ConnectException
 
 
 /**
@@ -142,5 +143,9 @@ fun authenticate(
                 }
             }
         }
+    } catch (exception: ConnectException) {
+        activity.runOnUiThread {
+            Toast.makeText(activity, "Could not connect to the server: $exception", Toast.LENGTH_SHORT).show()
+        }
     }
 }

app/src/main/java/com/faraphel/tasks_valider/ui/screen/communication/connection/wifiP2p/role/client.kt

@@ -3,6 +3,7 @@ package com.faraphel.tasks_valider.ui.screen.communication.connection.wifiP2p.ro
 import android.app.Activity
 import android.net.wifi.p2p.WifiP2pConfig
 import android.net.wifi.p2p.WifiP2pDevice
+import android.widget.Toast
 import androidx.compose.foundation.layout.Column
 import androidx.compose.runtime.*
 import com.faraphel.tasks_valider.connectivity.bwd.BwdManager
@@ -10,9 +11,7 @@ import com.faraphel.tasks_valider.connectivity.task.TaskClient
 import com.faraphel.tasks_valider.connectivity.task.session.TaskSession
 import com.faraphel.tasks_valider.ui.screen.communication.DEFAULT_SERVER_PORT
 import com.faraphel.tasks_valider.ui.screen.communication.authentication.AuthenticationClientScreen
-import com.faraphel.tasks_valider.ui.screen.communication.connection.internet.role.CommunicationInternetClientContent
 import com.faraphel.tasks_valider.ui.screen.task.TaskSessionController
-import com.faraphel.tasks_valider.ui.screen.task.TaskSessionScreen
 import com.faraphel.tasks_valider.ui.widgets.connectivity.WifiP2pDeviceListWidget
 
 
@@ -23,7 +22,7 @@ fun CommunicationWifiP2pClientScreen(activity: Activity, bwdManager: BwdManager)
 
     // if the client is not connected, show the connection screen
     if (client.value == null)
-        return CommunicationWifiP2pClientContent(client, bwdManager)
+        return CommunicationWifiP2pClientContent(activity, client, bwdManager)
     // if the user is not authenticated, show the authentication screen
     if (session.value == null)
         return AuthenticationClientScreen(activity, client.value!!, session)
@@ -39,11 +38,13 @@ fun CommunicationWifiP2pClientScreen(activity: Activity, bwdManager: BwdManager)
 
 @Composable
 fun CommunicationWifiP2pClientContent(
+    activity: Activity,
     client: MutableState<TaskClient?>,
     bwdManager: BwdManager,
 ) {
     val selectedDevice = remember { mutableStateOf<WifiP2pDevice?>(null) }
 
+    // if the device is not selected
     if (selectedDevice.value == null) {
         Column {
             WifiP2pDeviceListWidget(
@@ -66,11 +67,20 @@ fun CommunicationWifiP2pClientContent(
     }
     bwdManager.connect(config) {
         bwdManager.requestConnectionInfo { connectionInfo ->
+            // if the group has not been formed correctly, the host did not approve the connection
+            if (!connectionInfo.groupFormed) {
+                selectedDevice.value = null
+                Toast.makeText(activity, "Require host approval.", Toast.LENGTH_LONG).show()
+                return@requestConnectionInfo
+            }
+
+            // create a connection to the server
             // TODO(Faraphel): check if the server is reachable
             client.value = TaskClient(
-                connectionInfo.groupOwnerAddress.toString(),
+                connectionInfo.groupOwnerAddress.hostAddress!!,
                 DEFAULT_SERVER_PORT
             )
         }
     }
+
 }

app/src/main/java/com/faraphel/tasks_valider/ui/widgets/connectivity/WifiP2pDeviceListWidget.kt

@@ -2,10 +2,14 @@ package com.faraphel.tasks_valider.ui.widgets.connectivity
 
 import android.net.wifi.p2p.WifiP2pDevice
 import android.net.wifi.p2p.WifiP2pDeviceList
-import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.*
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.MutableState
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
 
 
 /**
@@ -20,9 +24,24 @@ fun WifiP2pDeviceListWidget(
     filter: ((WifiP2pDevice) -> Boolean)? = null,
     deviceState: MutableState<WifiP2pDevice?>? = null,
 ) {
-    Text(text = "Devices (${peers?.deviceList?.size ?: 0})")
+    Column(
+        modifier = Modifier.fillMaxSize(),
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        // title
+        Text(
+            text = "Devices",
+            fontSize = 32.sp,
+        )
+        // found device count
+        Text(
+            text = "(${peers?.deviceList?.size ?: 0})",
+            fontSize = 24.sp,
+        )
+
+        // separator
+        Spacer(modifier = Modifier.height(24.dp))
 
-    Column {
         // if there are peers to display
         if (peers != null) {
             // for every device in the list