ucentral-event: Add BSSID/SSID to client stats payload

Populate bssid and ssid in the nl_cb client event payload by
resolving the hostapd instance using msg.msg.dev. Defaults to empty
values if hostapd context is unavailable.

Improves client visibility in multi-BSS deployments.

Fixes WiFi-15352

Signed-off-by: Venkat Chimata <venkat@nearhop.com>

feeds/ucentral/ucentral-event/files/ucentral-event

@@ -588,8 +588,13 @@ function listener_cb(event, payload) {
 function nl_cb(msg) {
 	let mac = msg.msg.mac;
 	let sinfo = msg.msg.sta_info;
+	let dev = msg.msg.dev;
+
+	let hapd = hostapd[dev];
 	let payload = {
 		client: mac,
+		bssid: hapd?.bssid || '',
+		ssid: hapd?.ssid || '',
 		tx_bytes: sinfo.tx_bytes64,
 		rx_bytes: sinfo.rx_bytes64,
 		tx_packets: sinfo.tx_packets,