autotests: Restore AP beacons after timeout in testFT-PSK-roam

In the beacon loss test try to simulate a periodic communication problem
because we don't support roaming if the AP goes away completely.
2 seconds seems to be enough to consistently trigger the beacon_loss
event without triggering a disconnect by the linux kernel or hiding the AP
from the roam scan.  Also set the RSSI for that AP lower so that it is
not reselected by iwd.

autotests/testFT-PSK-roam/test.py

@@ -76,7 +76,12 @@ class Test(unittest.TestCase):
         self.assertRaises(Exception, testutil.test_ifaces_connected,
                           (self.bss_hostapd[1].ifname, device.name))
 
-        # Check that iwd starts transition to BSS 1 in less than 10 seconds
+        # Check that iwd starts transition to BSS 1 in less than 10 seconds.
+        # The 10 seconds is longer than needed to scan on just two channels
+        # but short enough that a full scan on the 2.4 + 5.8 bands supported
+        # by mac80211_hwsim will not finish.  If this times out then, but
+        # device_roam_trigger_cb has happened, it probably means that
+        # Neighbor Reports are broken.
         rule0.signal = -8000
 
         condition = 'obj.state == DeviceState.roaming'
@@ -157,11 +162,15 @@ class Test(unittest.TestCase):
         self.assertRaises(Exception, testutil.test_ifaces_connected,
                           (self.bss_hostapd[1].ifname, device.name))
 
-        # Check that iwd starts transition to BSS 1 in less than 10 seconds
+        # Check that iwd starts transition to BSS 1 in less than 20 seconds
-        os.system('ifconfig "' + self.bss_hostapd[0].ifname + '" down')
+        # from a beacon loss event
+        rule0.drop = True
+        rule0.signal = -3000
+        wd.wait(2)
+        rule0.drop = False
 
         condition = 'obj.state == DeviceState.roaming'
-        wd.wait_for_object_condition(device, condition, 10)
+        wd.wait_for_object_condition(device, condition, 20)
 
         # Check that iwd is on BSS 1 once out of roaming state and doesn't
         # go through 'disconnected', 'autoconnect', 'connecting' in between
@@ -177,6 +186,8 @@ class Test(unittest.TestCase):
                           (self.bss_hostapd[0].ifname, device.name))
 
     def tearDown(self):
+        os.system('ifconfig "' + self.bss_hostapd[0].ifname + '" down')
+        os.system('ifconfig "' + self.bss_hostapd[1].ifname + '" down')
         os.system('ifconfig "' + self.bss_hostapd[0].ifname + '" up')
         os.system('ifconfig "' + self.bss_hostapd[1].ifname + '" up')
 

autotests/util/hwsim.py

@@ -103,6 +103,14 @@ class Rule(HwsimDBusAbstract):
         self._prop_proxy.Set(self._iface_name, 'SignalStrength',
                 dbus.Int16(value))
 
+    @property
+    def drop(self):
+        return bool(self._properties['Drop'])
+
+    @drop.setter
+    def drop(self, value):
+        self._prop_proxy.Set(self._iface_name, 'Drop', dbus.Boolean(value))
+
     def remove(self):
         self._iface.Remove(reply_handler=self._success,
                 error_handler=self._failure)
@@ -117,7 +125,8 @@ class Rule(HwsimDBusAbstract):
                str(self.bidirectional) + '\n' + \
                prefix + '\tPriority:\t' + str(self.priority) + '\n' +\
                prefix + '\tFrequency:\t' + str(self.frequency) + '\n' + \
-               prefix + '\tApply rssi:\t' + str(self.signal) + '\n'
+               prefix + '\tApply rssi:\t' + str(self.signal) + '\n' + \
+               prefix + '\tApply drop:\t' + str(self.drop) + '\n'
 
 class RuleSet(collections.Mapping):
     def __init__(self, hwsim, objects):