[Data Layer] is it possible to send data from watch to mobile by data layer?

[JingjingZhangAndPan]

is it possible to send data from watch to mobile by data layer? is there has sample code of it, i have tried it, but it failed even two apps has same package name and same signalture.

[kul3r4]

Which Client are you using? Take a look at the client types documentation page if you haven't already.
An example for MessageClient in the Wearable sample