http://forum.xda-developers.com/android-wear/development/how-enable-keyboard-via-adb-t3083945
You need:
- enable developer options on the watch
- enable adb debugging on the watch
- adb on PC
not covered here:
- adb over BT
- authorize your computer for adb connection
Step by step:
adb devices -l adb install HWI.apk adb shell ime enable com.google.android.apps.handwriting.ime/.HandwritingIME ime set com.google.android.apps.handwriting.ime/.HandwritingIME exit
Start it on the watch.
- enabled should be checked
- download your language specific data files (German was ~8.1 MB)
- selected should be checked
In the input box labelled "Ready to try" (or so) you can test it.
Tested on:
Sony Smartwatch 3 (SW3, SWR50)I have no idea how good/bad it will work on a round watch.
abbr.:
- abbr. = abbreviations
- adb = android debug bridge
- BT = BlueTooth
- HWI = handwriting input






