need a list of linux shell commands

[juji]

for the 20th time, what I want is a background service that sends a udp packet to notify other devices when the phone rings. I don't need a client application for android because the phone already knows it's ringing.

The client version can do REST to backend server in real time which is background service that client is listening everytime, then call a sound file, the backend server is the alarm that sends udp packet to notify every devices when the phone rings.


That's another possible design.