Try to research harder...
Again.
Look into this post with open eyes... there is SDB + manuals attached:
https://forum.xda-developers.com/showpost.php?p=74585286&postcount=330
RTFM
A.
Activate Debugging... in your Gear Watch...
This is the most mandatory part...
B.
Connect to WiFi... so you can find IP address in your Gear...
C.
Be sure you know your IP address.. to fire up connection Command:
Replace YOUR_IP with your IP.
Example...
I'll repeat... this example... NOT Copy & Paste...
If correct IP... sdb tell you something fail crap...
And on Display you will see something with RSA crap confirmation...
I hope this help...
BTW...
You can google for SDB connection with Wearables... if my SDB + instruction not lead to any usefull result...
Good luck.
Best Regards