Send CTRL-EVENT-NETWORK-NOT-FOUND if no suitable network was found

This provides more information to upper layer programs on what happens
with connection attempts in cases where the enabled networks are not
found in scan results.

Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>

src/common/wpa_ctrl.h

@@ -68,6 +68,8 @@ extern "C" {
 #define WPA_EVENT_BSS_ADDED "CTRL-EVENT-BSS-ADDED "
 /** A BSS entry was removed (followed by BSS entry id and BSSID) */
 #define WPA_EVENT_BSS_REMOVED "CTRL-EVENT-BSS-REMOVED "
+/** No suitable network was found */
+#define WPA_EVENT_NETWORK_NOT_FOUND "CTRL-EVENT-NETWORK-NOT-FOUND "
 /** Change in the signal level was reported by the driver */
 #define WPA_EVENT_SIGNAL_CHANGE "CTRL-EVENT-SIGNAL-CHANGE "
 /** Regulatory domain channel */

wpa_supplicant/events.c

@@ -1628,6 +1628,9 @@ static int wpas_select_network_from_last_scan(struct wpa_supplicant *wpa_s,
 			if (wpa_supplicant_req_sched_scan(wpa_s))
 				wpa_supplicant_req_new_scan(wpa_s, timeout_sec,
 							    timeout_usec);
+
+			wpa_msg_ctrl(wpa_s, MSG_INFO,
+				     WPA_EVENT_NETWORK_NOT_FOUND);
 		}
 	}
 	return 0;