The #TpContact with who we are exchanging data through this tube, or %NULL if we can't safely identify the contact.
If not %NULL, the #TpContact objects is guaranteed to have all of the features previously passed to tp_simple_client_factory_add_contact_features() prepared.
The #GSocketConnection used to transfer data through this connection. Read-only except during construction.
This property can't be %NULL.
The #TpStreamTubeChannel channel associated with this connection
This property can't be %NULL.