There seems to be a "Remind" plugin which seems to do something like this and provides a bit more features than the `/echo` command.
Disclaimer: However, I didn't test it so far, and it does not seem to be too actively maintained. There's a bunch of open issues, and not much development activity.
But maybe it's a starting point if someone wants to help out.
Gunter Ohrner
There seems to be a "Remind" plugin which seems to do something like this and provides a bit more features than the `/echo` command.
Disclaimer: However, I didn't test it so far, and it does not seem to be too actively maintained. There's a bunch of open issues, and not much development activity.
But maybe it's a starting point if someone wants to help out.