This uses the official live telemetry stream from Lightstreamer, although – at least at the moment – it doesn't eg. check what the signal status is so telemetry might be down altogether and you'd never know. Maybe in v0.2.
Native menu bar application, so it doesn't require running a copy of Chromium and Node to show you two emojis and a percentage.
I got the idea for this when somebody linked to https://iss-mimic.github.io/Mimic/ joking about how we can see in real time how full the urine tank on the ISS is; after I understood that there's a public live telemetry stream I knew in my heart I had to do something very silly with it. I've also finally been learning Swift and macOS programming in general and I figured this'd be an excellent first Swift project, so here we all are.
Just as an aside, the "ISS Mimic" project itself is very interesting and worth checking out (https://github.com/ISS-Mimic/Mimic). I'm in no way, shape or form affiliated with them and they have no idea who I am.