@jonas I can create an install file for side loading it on devices. It was created with Android Studio, so I should be able to create an APK. If people are interested, as stated above, I can get it up on Play Store where people could download it from there. Still figuring out that side of it though. As for testers, I do not really need testers, as much as I need people to use the app, and let Google know they are using it. They can send any issues to me, so that I can fix them etc.
As for how it communicates, everything is send via JSON. The server receives something like:
"{"command":"remote-changed-playlist","id":13,"from-index":0,"to-index":1}"
On the server side, it just communicates with the functions you already incorporated, and sends the data to that, then broadcasts a JSON response back to any clients connected to the server. I made no changes to any of your code, other than adding some Q_EMITs here and there to send changes, and I added a Remote Controller section in the settings section. If you want to see what I made, I will make my changed version public (I just forked your work), and you can view it if you so desire. It is mostly under the "src/remotecontroller/" folder.
https://github.com/jacktolmie/strawberry_remote
With anyone having concerns about malicious code etc, I believe things like Claude AI etc should be able to view my code on GitHub, and let them know if anything is shady. A lot of it was done with help from AI, as I was learning this as I went along. Also, if they want to run a VM and install Android Studio, and the requirements needed to run your work on it, they could test it there and see if anything shady happens.