Send message to wear from mobile

MainActivity.java

    Wearable.NodeApi.getConnectedNodes(mGoogleApiClient).setResultCallback(new ResultCallback<NodeApi.GetConnectedNodesResult>() {
        @Override
        public void onResult(@NonNull NodeApi.GetConnectedNodesResult getConnectedNodesResult) {
            for (Node node : getConnectedNodesResult.getNodes()) {
                sendMessage(node);
            }
        }
    });


public static final String START_ACTIVITY_PATH = "/dataitem/LaunchApp";

    private void sendMessage(final Node node) {
        Wearable.MessageApi.sendMessage(mGoogleApiClient ,
                node.getId() ,
                START_ACTIVITY_PATH , new byte[0])
                .setResultCallback(new ResultCallback<MessageApi.SendMessageResult>() {

            @Override
            public void onResult(@NonNull MessageApi.SendMessageResult sendMessageResult) {

                if (!sendMessageResult.getStatus().isSuccess()) {
                    Log.e("GoogleApi", "Failed to send message with status code: "
                            + sendMessageResult.getStatus().getStatusCode());
                } else {
                    Log.i(TAG, "GoogleApi: Send Message " + node.getDisplayName());
                }

            }
        });
    }