Developing consumer-compaion app for new Galaxy Watch 4 with Wear OS

I have a few Tizen & Web apps for previous Galaxy watch models which work together with a companion app on the Android phone.
Now I want to port these apps to new Wear OS watch (Galaxy Watch 4)
is there a guide to develop a Wear OS app which would work in combination with a companion app on phone ?


As far as I know, still watch 4 does not support SAP. Instead of SAP you can use Data layer for the companion app.
Here is the link: Send and sync data on Wear OS  |  Android Developers

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thanks for the information.
Google documentation is really weak.
is there an example app source which we can check how the implementation is done ?

Check this one:

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thanks. I found that and compiled. I am trying to understand.

Thanks anyway.