I don't have any iOS devices to test with, but I believe that it does not work in any browser on iOS.
The specific API this project uses is Web Serial, which is not supported by Safari. Chrome for iOS (and every other browser for iOS) is simply a wrapper around the same engine that Safari uses. I think that APIs like Web Serial could be supported in theory but I could be wrong and I'm not aware of any attempt to do it.
I don't have any iOS devices to test with, but I believe that it does not work in any browser on iOS.
The specific API this project uses is Web Serial, which is not supported by Safari. Chrome for iOS (and every other browser for iOS) is simply a wrapper around the same engine that Safari uses. I think that APIs like Web Serial could be supported in theory but I could be wrong and I'm not aware of any attempt to do it.