When debugging indirectly, via the smartphone connected with USB to the PC and then over Bluetooth to the watch, these are the lines I’m always searching for:
adb forward tcp:4444 localabstract:/adb-hub
adb connect 127.0.0.1:4444
Under Windows, ‘adb’ is located in the folder:
C:\Users\[user]\AppData\Local\Android\sdk\platform-tools
More on https://developer.android.com/training/wearables/apps/debugging