It's currently impossible to reach the network handle from callbacks
that are called during co_init(), because even if the cb_arg is already
set up to point to a global object that is going to hold the network
handle, co_init() must return the handle before it can be stored there.
Add a function to retrieve the cb_arg opaque argument from the network
handle when needed. This is also useful to reach application specific
context in the object access functions.
Also add a function to get the node ID, which may differ from the default
because of LSS.
It's currently impossible to reach the network handle from callbacks that are called during co_init(), because even if the cb_arg is already set up to point to a global object that is going to hold the network handle, co_init() must return the handle before it can be stored there.
Add a function to retrieve the cb_arg opaque argument from the network handle when needed. This is also useful to reach application specific context in the object access functions.
Also add a function to get the node ID, which may differ from the default because of LSS.