The DownloadPortalItemData.swift script is used to download all the offline data for samples. Per Nimesh's experience, if the network is unstable, the script fails to download all the data and reports time out for some items.

Improve the script in a way to better handle a choppy network connection. Some initial ideas include:

• Find out under what condition the script times out (with Network Link Conditioner maybe)
• Retry if time out
• Rate limit the downloads by sequentially download each item, and add a pause between each download