nimble/btp: Fix address assignment in padv operations

In periodic sync procedure assignment was wrong due
to device not being connected - this resulted in
assert condition trigger.

Also during periodic transfer reception we now assign
proper address to send to tester. Previous lookup for
connection was wrong, due to invalid parameter passed
into `ble_gap_conn_find` function.

Author: szymon-czapracki

apps/bttester/src/btp_gap.c

@@ -1202,17 +1202,11 @@ bond_lost(uint16_t conn_handle)
 static void
 sync_established(struct ble_gap_event *event)
 {
-    int rc;
-    struct ble_gap_conn_desc desc;
     struct gap_periodic_sync_est_ev ev;
 
     ev.status = event->periodic_sync.status;
     ev.sync_handle = event->periodic_sync.sync_handle;
-
-    rc = ble_gap_conn_find(ev.sync_handle, &desc);
-    assert(rc == 0);
-
-    ev.peer_addr = desc.peer_id_addr;
+    ev.peer_addr = event->periodic_sync.adv_addr;
 
     tester_event(BTP_SERVICE_ID_GAP, GAP_EV_PERIODIC_SYNC_ESTABLISHED,
                  (uint8_t *) &ev, sizeof(ev));
@@ -1261,7 +1255,7 @@ periodic_transfer_received(struct ble_gap_event *event)
     ev.sync_handle = event->periodic_transfer.sync_handle;
     ev.status = event->periodic_transfer.status;
 
-    rc = ble_gap_conn_find(ev.sync_handle, &desc);
+    rc = ble_gap_conn_find(event->periodic_transfer.conn_handle, &desc);
     assert(rc == 0);
 
     ev.peer_addr = desc.peer_id_addr;