DSR is on. Don't send DTR on Android
android
Solution
DSR = Data Set Ready DTR = Data Terminal Ready
`<nostalgia>`These are (hardware) flow control signals that are used for serial communications between devices like printers, modems, etc.`</nostalgia>`.
Since your tethering is via USB I'm guessing that there is some kind of USB serial port emulator that is running that may be generating these log messages. But that's just a guess.
Problem
In the logcat I'm seeing this a lot "DSR is on. Don't send DTR on Android". I have tethered my phone wirelessly to my mac because my internet is down. I have it in dev mode also. So what does that mean? I have seen something about bluetooth but it's off though. DSR? DTR?