tests: Add some coverage for Device Discoverability exchange

This is not really perfect, but something to get a bit more testing
coverage.. For proper discoverability mechanism validation, the P2P
client would need to go to sleep to avoid acknowledging the GO
Negotiation Request frame. Offchannel Listen mode operation on the P2P
Client with mac80211_hwsim is apparently not enough to avoid the
acknowledgement on the operating channel, so need to disconnect from the
group which removes the GO-to-P2P Client part of the discoverability
exchange in practice.

Signed-hostap: Jouni Malinen <j@w1.fi>

tests/hwsim/test_p2p_discovery.py

@@ -89,3 +89,33 @@ def test_discovery_group_client(dev):
     logger.info("Try to discover a P2P client in a group")
     if not dev[2].discover_peer(dev[1].p2p_dev_addr(), social=False):
         raise Exception("Could not discover group client")
+
+    # This is not really perfect, but something to get a bit more testing
+    # coverage.. For proper discoverability mechanism validation, the P2P
+    # client would need to go to sleep to avoid acknowledging the GO Negotiation
+    # Request frame. Offchannel Listen mode operation on the P2P Client with
+    # mac80211_hwsim is apparently not enough to avoid the acknowledgement on
+    # the operating channel, so need to disconnect from the group which removes
+    # the GO-to-P2P Client part of the discoverability exchange in practice.
+
+    pin = dev[2].wps_read_pin()
+    # make group client non-responsive on operating channel
+    dev[1].dump_monitor()
+    dev[1].group_request("DISCONNECT")
+    ev = dev[1].wait_event(["CTRL-EVENT-DISCONNECTED"])
+    if ev is None:
+        raise Exception("Timeout on waiting disconnection")
+    dev[2].request("P2P_CONNECT {} {} display".format(dev[1].p2p_dev_addr(),
+                                                      pin))
+    ev = dev[1].wait_event(["P2P-GO-NEG-REQUEST"], timeout=2)
+    if ev:
+        raise Exception("Unexpected frame RX on P2P client")
+    # make group client available on operating channe
+    dev[1].request("REASSOCIATE")
+    ev = dev[1].wait_event(["CTRL-EVENT-CONNECTED", "P2P-GO-NEG-REQUEST"])
+    if ev is None:
+        raise Exception("Timeout on reconnection to group")
+    if "P2P-GO-NEG-REQUEST" not in ev:
+        ev = dev[1].wait_event(["P2P-GO-NEG-REQUEST"])
+        if ev is None:
+            raise Exception("Timeout on waiting for GO Negotiation Request")