won't uploading to the scanner cause a reboot (and interruption to the stream) anyhow?
I don't believe that this gentleman has ever programmed a scanner while it is streaming.
So no, the scanner itself is no longer streaming audio, that's the bottom line answer.
The reason why I'm splitting hairs here is this gentleman "challenged" me via numerous emails, telling me I obviously have never programmed a scanner in my life, and that since he's been in the hobby since 1981 that I might learn a thing or two from him, and, that I have no idea what I'm talking about. The root of this issue is that he loses his premium subscription when he brings his stream down and therefore cannot program his scanner with the Web service, so he reached out to us for help for which we're more than happy to provide all of our feed providers. However, our audio admin team has repeatably, and I mean repeatably responded to him with solutions, only to be met with each time the brick wall of "I've been doing this longer than you and listen to me and respect my scanner knowledge authority!"
We as a team, after reviewing with him privately the info as we stated above, just finally decided to step back and let the "more experienced" of the bunch settle into his own decisions on the matter.
When using ScannerCast you can suspend sending tags under the advanced tab which frees up the port the data cable is on and still allows the audio to stream. This will allow you to make changes to the scanner such as adding talkgroups, new freqs, and resume sending the tags when done by clicking the Resume sending tags selection in the Advanced Tab section.
There are some of us who have the rear port feeding TAGS and use the front port for updates. Therefore, you don't have tp suspend sending tags in ScannerCast.