diff --git a/res/miracle-wfdctl-demo b/res/miracle-wfdctl-demo
index e494416..2cb2917 100755
--- a/res/miracle-wfdctl-demo
+++ b/res/miracle-wfdctl-demo
@@ -103,6 +103,7 @@ get_prop()
 
 cleanup()
 {
+    trap '' TERM
     set +e
     while (( 0 != ${#cleanup[@]} )); do
         eval ${cleanup[${#cleanup[@]}-1]}
@@ -148,10 +149,12 @@ peer_disconnect()
         Disconnect
 }
 
-killall miracle-wifid &>/dev/null || true
-killall miracle-wfwctl &>/dev/null || true
+sudo killall miracle-wifid &>/dev/null || true
+sudo killall miracle-wfwctl &>/dev/null || true
 
 trap cleanup EXIT
+trap 'exit 0' TERM
+trap '' CHLD
 
 set_prop org.freedesktop.NetworkManager \
     /org/freedesktop/NetworkManager/Devices/"$nm_link_index" \
@@ -177,6 +180,7 @@ set_prop org.freedesktop.miracle.wifi \
     P2PScanning b true
 cleanup_push link_stop_p2pscan
 echo connect to peer...
+dump_packets &
 invoke org.freedesktop.miracle.wifi \
     /org/freedesktop/miracle/wifi/peer/$peer_id \
     org.freedesktop.miracle.wifi.Peer \
@@ -190,7 +194,7 @@ get_prop org.freedesktop.miracle.wifi \
 tcpdump -nnvvXS -s 0 -i $p2p_iface port 7236 or port 67 or port 68 &
 cleanup_push "kill $!"
 
-while ! killall -0 miracle-wfdctl && [[ -z "$nocheck" ]] &>/dev/null; do
+while [[ -z "$nocheck" ]] && ! killall -0 miracle-wfdctl &>/dev/null; do
     echo please run miracle-wfdctl manually
     sleep 3
 done