Ubuntu 24.10 NetworkManager bgscan

gboolean
nm_supplicant_config_add_bgscan(NMSupplicantConfig *self,
                                NMConnection       *connection,
                                guint               num_seen_bssids,
                                GError            **error)
{
    NMSettingWireless         *s_wifi;
    NMSettingWirelessSecurity *s_wsec;
    const char                *bgscan;

    s_wifi = nm_connection_get_setting_wireless(connection);
    g_assert(s_wifi);

    /* Don't scan when a shared connection (either AP or Ad-Hoc) is active;
     * it will disrupt connected clients.
     */
    if (NM_IN_STRSET(nm_setting_wireless_get_mode(s_wifi),
                     NM_SETTING_WIRELESS_MODE_AP,
                     NM_SETTING_WIRELESS_MODE_ADHOC))
        return TRUE;

    /* Don't scan when the connection is locked to a specific AP, since
     * intra-ESS roaming (which requires periodic scanning) isn't being
     * used due to the specific AP lock. (bgo #513820)
     */
    if (nm_setting_wireless_get_bssid(s_wifi))
        return TRUE;

    /* Default to a very long bgscan interval when signal is OK on the assumption
     * that either (a) there aren't multiple APs and we don't need roaming, or
     * (b) since EAP/802.1x isn't used and thus there are fewer steps to fail
     * during a roam, we can wait longer before scanning for roam candidates.
     */
   bgscan = "simple:30:-70:86400";

    /* If using WPA Enterprise, Dynamic WEP or we have seen more than one AP use
     * a shorter bgscan interval on the assumption that this is a multi-AP ESS
     * in which we want more reliable roaming between APs. Thus trigger scans
     * when the signal is still somewhat OK so we have an up-to-date roam
     * candidate list when the signal gets bad.
     */
    if (num_seen_bssids > 1u
        || ((s_wsec = nm_connection_get_setting_wireless_security(connection))
            && NM_IN_STRSET(nm_setting_wireless_security_get_key_mgmt(s_wsec),
                            "ieee8021x",
                            "wpa-eap",
                            "wpa-eap-suite-b-192")))
        bgscan = "simple:30:-65:300";

    return nm_supplicant_config_add_option(self, "bgscan", bgscan, -1, FALSE, error);
}