I didn't know there is an Andriod App for this ... thanks!
but now that I'm thinking about it , I have another problem
my Mikrotik is behind another router that he is the main gateway
in the "Main router" I have only port forward the VPN port TCP_1194 - so will the port knocking is not afective , unless I open another port and forward it to the Mikrotik - no?
this is what I see in the log , it's seem that some success connect to my netwrok, no ?
15:20:28 ovpn,info TCP connection established from 167.94.138.47
15:20:28 ovpn,debug,packet sent P_CONTROL_HARD_RESET_SERVER_V2 kid=0 sid=7843a8f18b30eeb3 pid=0 DATA len=0
15:20:28 ovpn,debug,packet rcvd P_CONTROL_HARD_RESET_CLIENT_V2 kid=0 sid=3d56fddc9a0938f pid=0 DATA len=0
15:20:28 ovpn,debug,packet sent P_ACK kid=0 sid=7843a8f18b30eeb3 [0 sid=3d56fddc9a0938f] DATA len=0
15:20:28 ovpn,debug <167.94.138.47>: disconnected <peer disconnected>
15:20:28 ovpn,info TCP connection established from 167.94.138.47
15:20:28 ovpn,debug,packet sent P_CONTROL_HARD_RESET_SERVER_V2 kid=0 sid=15f09831dff6ddb4 pid=0 DATA len=0