Hi there,
So starting with this understanding moving forward.
" The main difference between BLE Notify and BLE Indicate is that BLE Notify is unacknowledged, while BLE Indicate is acknowledged:
- BLE Notify
A one-way communication method that broadcasts data to any neighboring devices within range. BLE Notify is faster than BLE Indicate, but it’s also less reliable. It’s energy efficient because it saves on radio airtime.
- BLE Indicate
An acknowledged message or update that requires a response from the client.
Both BLE Notify and BLE Indicate are methods for pushing data to a remote client when a Bluetooth Low Energy (BLE) device has new data. The client enables the operations, but the server initiates them "
Given that It sounds to me maybe Just advertising the data would be a better fit ?
A connection is always required otherwise… Check the Nordic Button Service Demo on here for how it works.
HTH
GL 
PJ 