android/app/build.gradle.kts

@@ -68,7 +68,8 @@ dependencies {
 
     implementation(platform("com.google.firebase:firebase-bom:34.14.1"))
     implementation("com.google.firebase:firebase-analytics")
-    implementation("com.google.firebase:firebase-messaging-ktx:24.1.0")
+    implementation("com.google.firebase:firebase-messaging-ktx")
+    implementation("com.google.firebase:firebase-common-ktx")
 
     debugImplementation("androidx.compose.ui:ui-tooling")
     debugImplementation("androidx.compose.ui:ui-test-manifest")

android/app/src/main/java/com/devlab/app/ui/login/LoginViewModel.kt

@@ -1,5 +1,6 @@
 package com.devlab.app.ui.login
 
+import android.util.Log
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.devlab.app.ServerManagerApp
@@ -43,6 +44,7 @@ class LoginViewModel : ViewModel() {
                     isConnected = true,
                     username = savedUsername
                 )
+                registerFcmToken()
             }
         }
     }
@@ -109,7 +111,10 @@ class LoginViewModel : ViewModel() {
                 fcmToken = withContext(Dispatchers.IO) {
                     try {
                         Tasks.await(FirebaseMessaging.getInstance().token)
-                    } catch (_: Exception) { "" }
+                    } catch (e: Exception) {
+                        Log.e(TAG, "Failed to fetch FCM token from Firebase: ${e.message}")
+                        ""
+                    }
                 }
                 if (fcmToken.isNotBlank()) {
                     prefs.saveFcmToken(fcmToken)
@@ -118,7 +123,16 @@ class LoginViewModel : ViewModel() {
             if (fcmToken.isNotBlank()) {
                 val service = RetrofitClient.getApiService()
                 service.registerFcmToken(FcmRegisterRequest(fcmToken))
+                Log.d(TAG, "FCM token registered with backend")
+            } else {
+                Log.w(TAG, "FCM token is blank, skipping registration")
             }
-        } catch (_: Exception) { }
+        } catch (e: Exception) {
+            Log.e(TAG, "FCM token registration failed: ${e.message}")
+        }
     }
-}
+
+    companion object {
+        private const val TAG = "LoginViewModel"
+    }
+}