Mobile App Messaging supports message templates, scheduled deliveries, automatic messages and delivery-history review. Use it for concise schedule reminders, room changes, onsite announcements and other time-sensitive attendee communication.
Build reusable templates for recurring message types and review the delivery history when troubleshooting. Keep important operational changes in the authoritative event/session data as well; a message should notify attendees about a change, not be the only place the change exists.