title: Android 9 drops WiFi connection with no Internet
body: <p>i want to stay connected to a Wifi with no Internet in case to remote Control a device.
  I have a foreground Service that's Holding a WiFi lock and i also tried to bindProcessToNetworkLooks like this:</p>
  
  <pre><code>val wifiManager = applicationContext
              .getSystemService(WIFI_SERVICE) as WifiManager
  
      if (wifiLock == null) {
          wifiLock = wifiManager.createWifiLock(WIFI_MODE_FULL_HIGH_PERF, "cameraServiceWifiLock")
      }
  
      Timber.d("CameraService wifiLock null=%s held=%s", wifiLock != null, wifiLock?.isHeld)
      if (wifiLock != null &amp;&amp; !wifiLock!!.isHeld) {
          Timber.d("CameraService wifiLock acquire")
          wifiLock!!.acquire()
      }
  
  
      val cm = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
      if (SDK_INT &gt;= M &amp;&amp; CameraApi.network != null) {
          Timber.d("CameraService bindProcessToNetwork")
          cm.bindProcessToNetwork(CameraApi.network)
      }
  </code></pre>
  
  <p>now i found out that the Android System keeps dropping the WiFi randomly log:</p>
  
  <pre><code>D/WificondControl: Scan result ready event
  I/LOWI-8.5.0.3.a: [LOWI-Scan] lowi_close_record:Scan completed in 46343838ms and Recieved 7 APs scan results
  D/WifiStateMachine: CMD_START_CONNECT sup state CompletedState my state ConnectedState nid=26 roam=false
  I/WifiStateMachine: Connecting with [...] as the mac address
  W/wificond: Scan is not started. Ignore abort request
  D/SupplicantStaIfaceHal: connectToNetwork "FRITZ!Box 7530 ZI"WPA_PSK
  I/wpa_supplicant: wlan0: CTRL-EVENT-DISCONNECTED bssid=[...] reason=3 locally_generated=1
  E/wpa_supplicant: nl80211: Failed to open /proc/sys/net/ipv4/conf/wlan0/drop_gratuitous_arp: No such file or directory
  20E/wpa_supplicant: nl80211: Failed set gratuitous ARP filter
  2E/wpa_supplicant: nl80211: Failed to open /proc/sys/net/ipv4/conf/wlan0/drop_gratuitous_arp: No such file or directory
  E/wpa_supplicant: nl80211: Failed set gratuitous ARP filter
  </code></pre>
  
  <p>Do you know what disconnect reason=3 means or how i can  tell android that this is the Network that should be used at the Moment?</p>
  
  <p><strong>Update1:</strong></p>
  
  <p>reason=3 in Linux seems to be that the device can't resolve an address via DCHP. I tried to set the static Ip of the device in the WiFi configuration - didn't change anything</p>