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Very good question and important to know (e.g. if you debug):
BLE knows Notification and Indications (first is unreliable, second is reliable due to acknowledge from receiver/client expected).
If a client (Android Smartphone) has subscribed to a Notification or Indication, the server (BLE device) will send ONLY if a NEW value is there.
Therefore, it can happen: if the sensor value does not change = nothing sent and nothing received on client.
A periodic timer (no idea) in case of very fast changes - I think the server/device can decide, e.g. every 1 second as fastest update speed, but still: just if value is new and changed.
If sensor value will never be changed - nothing sent and updated on client.