It’s pretty straight forward to setup debuggin of your android wear device via Bluetooth, until it’s not.
Under normal circumstances you can follow this guide and it will work:
https://developer.android.com/training/wearables/apps/bt-debugging.html
But then sometime when you run,
adb forward tcp:4444 localabstract:/adb-hub
adb connect localhost:4444
You get the following error:
adb server is out of date. killing...
* daemon started successfully *
unable to connect to localhost:4444:4444
Or you get
adb server version (31) doesn't match this client (36); killing...
What is wrong, it’s trying to connect to 4444:4444, that doesn’t look right.
The problem is that you most likely have another adb deamon running, on my machine it’s due to the HTC Manager or if I start Android Studio before I setup the connection from the command line.
Another issue that I have come across is that I’m not able to use localhost, but once i use 127.0.0.1 instead it works.
Finally if it is still unable to work, you can use the android wear app on your device to see if that can send a test message to the wear device. If that doesn’t work the entire bluetooth stack on either phone or watch is in some garbage state, and you can try to disable/enable bluetooth, or do a reboot of your device.