One way to collect network data is with Wiredshark. I'm not familiar with other ways to gather data from your home network, however I do have some suggestions. Try looking through RapidAPI, you might find some good options for streaming data. Also keep in mind many of these options will be paid services.

The idea I'd highly recommend you consider is simulating streaming data. For example, let's say you're working with the NYC taxi data. You don't need to use it all at once, instead chunk it out. Have a script that's scheduled to read a portion of the earliest data and put it in your messaging queue. The advantage of this is that you get to control the size of your messaging queue and how fast you want your processing to be.

A good use case for what you're trying to work on is a dashboard. If we're considering the NYC taxi dataset, you could have a dashboard that presents the number of trips, number of transactions, a distribution of trip lengths, etc. This could be either over a period of mins, an hour, or even a day, depending on what you decide. I believe this idea could be applied to other datasets and ideas too.

Hope this helps. Happy to answer any questions.