Hello @BaxEDM ,
When a connection drops you can shut down the OTA Agent by calling OTA_Shutdown and start it when the connection is back. However if you want to resume the download form the point it was interrupted you can suspend the OTA Agent when the connection drops by calling OTA_Suspend. When connection is back again you can call OTA_Resume to resume the interrupted download if any when it was suspended.
Please let me know if that answers your question.