Fix missing api version check for usb/ip

app/src/main/java/io/nekohasekai/sfa/bg/PlatformInterfaceWrapper.kt

@@ -169,23 +169,6 @@ interface PlatformInterfaceWrapper : PlatformInterface {
 
     override fun localDNSTransport(): LocalDNSTransport? = LocalResolver
 
-    @OptIn(ExperimentalEncodingApi::class)
-    override fun systemCertificates(): StringIterator {
-        val certificates = mutableListOf<String>()
-        val keyStore = KeyStore.getInstance("AndroidCAStore")
-        if (keyStore != null) {
-            keyStore.load(null, null)
-            val aliases = keyStore.aliases()
-            while (aliases.hasMoreElements()) {
-                val cert = keyStore.getCertificate(aliases.nextElement())
-                certificates.add(
-                    "-----BEGIN CERTIFICATE-----\n" + Base64.encode(cert.encoded) + "\n-----END CERTIFICATE-----",
-                )
-            }
-        }
-        return StringArray(certificates.iterator())
-    }
-
     override fun startNeighborMonitor(listener: NeighborUpdateListener?) {
         if (listener == null) return
         val callback = object : INeighborTableCallback.Stub() {

app/src/main/java/io/nekohasekai/sfa/compose/screen/usbip/USBIPStatusViewModel.kt

@@ -52,6 +52,10 @@ data class USBIPStatusState(
 )
 
 class USBIPStatusViewModel : BaseViewModel<USBIPStatusState, Nothing>() {
+    companion object {
+        private const val MIN_API_VERSION_USBIP = 2
+    }
+
     private var subscription: USBIPServerStatusSubscription? = null
 
     override fun createInitialState() = USBIPStatusState()
@@ -62,8 +66,16 @@ class USBIPStatusViewModel : BaseViewModel<USBIPStatusState, Nothing>() {
 
         viewModelScope.launch(Dispatchers.IO) {
             try {
+                val client = CommandTarget.standaloneClient()
+                if (client.getAPIVersion() < MIN_API_VERSION_USBIP) {
+                    viewModelScope.launch {
+                        updateState { copy(servers = emptyList(), isSubscribed = false) }
+                        subscription = null
+                    }
+                    return@launch
+                }
                 subscription =
-                    CommandTarget.standaloneClient().subscribeUSBIPServerStatus(
+                    client.subscribeUSBIPServerStatus(
                         object : USBIPServerStatusHandler {
                             override fun onStatusUpdate(status: USBIPServerStatusUpdate) {
                                 val servers = convertUpdate(status)