/* This module would be included from the file <erlang.idl> 
 * in the usual case 
 */
module Erlang {
    typedef sequence<octet, 255> Atom;
    // struct Node { ... } 
    // struct Reference { ... } 
    // etc.

    // this could be an unsigned long for a simple switch(msg.op)
    typedef Atom Operation; 

    // The first field could be some magic number
    struct Command {
	Operation op;
	sequence<any> args_in;
    };

    struct Control {
	Operation op;
	sequence<any> args_in;
    };

    struct Control_RV {
	sequence<any> args_out;
    };
};

module CAN {
    typedef Erlang::Atom CAN_Ref;
    typedef sequence<octet, 8> Data;
    
    struct Message {
	boolean remote;
	unsigned long arbitration_id;

	Data bytes;
    };

    exception Value_Error {
	string reason;
    };

    interface Driver {
	void init();

	void open(in string ifc, out CAN_Ref ifc_ref) raises (Value_Error);
	void close();

	/* oneway operations may not raise exceptions */
	oneway void send_message(in CAN_Ref ifc_ref, 
				 in Message msg);
	oneway void send(in CAN_Ref ifc_ref,
			 in unsigned long arbitration_id, 
			 in boolean remote,
			 in Data bytes);
    };

    interface PortOwner {
	/* Only oneway operations */
	oneway void on_message(in CAN_Ref ifc_ref, in Message msg);

	oneway void network_failure(in CAN_Ref ifc_ref, in string reason);
    };
};