Here is the appropriate wpa_supplicant patch for reference.
It simply triggers a new scan once a "low signal notification" was received.
diff -ur wpa_supplicant-0.6.4/src/common/wireless_copy.h wpa_supplicant-0.6.4_2//src/common/wireless_copy.h
--- wpa_supplicant-0.6.4/src/common/wireless_copy.h 2008-08-10 19:33:12.000000000 +0200
+++ wpa_supplicant-0.6.4_2//src/common/wireless_copy.h 2008-09-15 11:38:14.000000000 +0200
@@ -396,6 +396,8 @@
* pre-authentication
* (struct iw_pmkid_cand) */
+#define IWEVROAM 0x8C0A /* roaming threshold exceeded */
+
#define IWEVFIRST 0x8C00
#define IW_EVENT_IDX(cmd) ((cmd) - IWEVFIRST)
diff -ur wpa_supplicant-0.6.4/src/drivers/driver.h wpa_supplicant-0.6.4_2//src/drivers/driver.h
--- wpa_supplicant-0.6.4/src/drivers/driver.h 2008-08-10 19:33:12.000000000 +0200
+++ wpa_supplicant-0.6.4_2//src/drivers/driver.h 2008-09-15 11:30:50.000000000 +0200
@@ -1052,7 +1052,13 @@
* FT authentication sequence from the AP. The FT IEs are included in
* the extra information in union wpa_event_data::ft_ies.
*/
- EVENT_FT_RESPONSE
+ EVENT_FT_RESPONSE,
+
+ /**
+ * EVENT_ROAMING_THRESHOLD - Roaming threshold exceeded
+ */
+ EVENT_ROAMING_THRESHOLD
+
} wpa_event_type;
diff -ur wpa_supplicant-0.6.4/src/drivers/driver_wext.c wpa_supplicant-0.6.4_2//src/drivers/driver_wext.c
--- wpa_supplicant-0.6.4/src/drivers/driver_wext.c 2008-08-10 19:33:12.000000000 +0200
+++ wpa_supplicant-0.6.4_2//src/drivers/driver_wext.c 2008-09-15 11:40:50.000000000 +0200
@@ -497,8 +497,7 @@
return 0;
}
-
-
+
static int wpa_driver_wext_event_wireless_pmkidcand(
struct wpa_driver_wext_data *drv, const char *ev, size_t len)
{
@@ -684,6 +683,9 @@
wpa_driver_wext_event_wireless_pmkidcand(
drv, custom, iwe->u.data.length);
break;
+ case IWEVROAM:
+ wpa_supplicant_event(ctx, EVENT_ROAMING_THRESHOLD, NULL);
+ break;
}
pos += iwe->len;
diff -ur wpa_supplicant-0.6.4/wpa_supplicant/events.c wpa_supplicant-0.6.4_2//wpa_supplicant/events.c
--- wpa_supplicant-0.6.4/wpa_supplicant/events.c 2008-08-10 19:33:12.000000000 +0200
+++ wpa_supplicant-0.6.4_2//wpa_supplicant/events.c 2008-09-15 12:14:13.000000000 +0200
@@ -613,6 +613,10 @@
}
#endif /* CONFIG_NO_SCAN_PROCESSING */
+static void wpa_supplicant_event_roaming_threshold(struct wpa_supplicant *wpa_s)
+{
+ wpa_supplicant_req_scan(wpa_s, 0, 0);
+}
static void wpa_supplicant_event_associnfo(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
@@ -955,6 +959,9 @@
wpa_supplicant_event_ft_response(wpa_s, data);
break;
#endif /* CONFIG_IEEE80211R */
+ case EVENT_ROAMING_THRESHOLD:
+ wpa_supplicant_event_roaming_threshold(wpa_s);
+ break;
default:
wpa_printf(MSG_INFO, "Unknown event %d", event);
break;
--
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