Send and receive HTTP POST notifications.
Send a message to the `security` topic
ntfy pub security "Front door has been opened."
Send with a title, priority, and tags
ntfy publish --title="Someone bought your item" --priority=high --tags=duck ebay "Someone just bought your item: Platypus Sculpture"
Send at 8:30am
ntfy pub --at=8:30am delayed_topic "Time for school, sleepyhead..."
Trigger a webhook
ntfy trigger my_webhook
Subscribe to a topic (`<Ctrl c>` to stop listening)
ntfy sub home_automation
Display help
ntfy --help