Azure Function App and IoT Hub Event hub

I have a Azure Function App which is bound as a trigger to Azure IoT Hub Event Hub.

As soon as any event is received by IoT Hub it triggers the Function App function and the message is received inside the Function App.

I want to re-raise the triggers for old events and want them on Function App right from the beginning. How can I refire the IoT Hub events so that the Function App can receive them from the beginning?