Create a MibProxy object from another (copy constructor).
Create a MibProxy object for a management information subtree with the given root. The maximum access rights for all managed objects within the subtree are specified by max_access. These rights may be more strict than those of the remote managed objects, but less strict access rights have no effect. Thus the minimum of both access rights will be applied. All managed objects belonging to the given subtree are retrieved from a SNMP agent with the management interface address source.