How to schedule automatic repeat of output based on shipment status

Hello

We trigger an Order Ready Notice (ORN) to a customer when Planning is set on the shipment.

I have a client that would like to continue sending ORN's on a daily or every other day schedule until the customer picks up their order. The shipment status would then be set to Shipment start when the order was picked up and we would no longer send the ORN.

Have any of you implemented a process similar to this, and if so, can you share what steps were taken to make this work?

Thank you in advance for your time and assistance,

Catherine