"Knock on Ports" is a port knocking client compatible with knockd, icmpKNOCK and other port knocking servers. Features: - UDP/TCP/ICMP sequences - IPv4 and IPv6 support - customizable content of UDP and ICMP packets - ability to start another application after a knock - Tasker integration - interpacket delays - sequence shortcuts - customizable widget - data export/import - free, no ads, open source