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Comment by nickporter | Hacker News Reader

I think you're looking at either a different API, or an older version of it.

The blog post links to this documentation page:

One of them seems to be a wrapper for the other:

Game API (C++):

    void SendReliableMessage(
      std::vector< std::string > const & remote_endpoint_ids,
      std::vector< uint8_t > const & payload
    )

Nearby API (Java):

    public abstract void sendReliableMessage
      (GoogleApiClient apiClient, 
       List<String> remoteEndpointIds, 
       byte[] payload)

Note that this requires a "GoogleApiClient" object, which ties it to the mothership.