sysrqd is a small daemon intended to manage Linux Sysrq over network.
Its philosophy is to be very responsive under heavy load and try to be somehow reliable. Authentication is made by clear password.
You can download if from the Git repository.
% telnet localhost 4094 Trying 127.0.0.1... Connected to localhost.localdomain. Escape character is '^]'. sysrqd password: hello sysrq> s sysrq> u sysrq> q
s will do a Emergency Sync, q will exit the session. Other command like b (reBoot), o (pOweroff) or u (Umount) are available, and so on.