/**
 * Copyright - See the COPYRIGHT that is included with this distribution.
 * pvAccessCPP is distributed subject to a Software License Agreement found
 * in file LICENSE that is included with this distribution.
 */

#ifndef PVACONSTANTS_H_
#define PVACONSTANTS_H_

#include <pv/pvType.h>

namespace epics {
namespace pvAccess {

    /** PVA protocol magic number */
    const epics::pvData::int8 PVA_MAGIC = 0xCA;
    
    /** PVA protocol revision (implemented by this library). */
    const epics::pvData::int8 PVA_PROTOCOL_REVISION = 0;
    
    /** PVA version signature used to report this implementation version in header. */
    const epics::pvData::int8 PVA_VERSION = PVA_PROTOCOL_REVISION;

    /** Default PVA server port. */
    const epics::pvData::int32 PVA_SERVER_PORT = 5075;
    
    /** Default PVA beacon port. */
    const epics::pvData::int32 PVA_BROADCAST_PORT = 5076;
    
    /** PVA protocol message header size. */
    const epics::pvData::int16 PVA_MESSAGE_HEADER_SIZE = 8;
    
    /** All messages must be aligned to 8-bytes (64-bit). */
    const epics::pvData::int32 PVA_ALIGNMENT = 1;	// TODO

    /**
     * UDP maximum send message size.
     * MAX_UDP: 1500 (max of ethernet and 802.{2,3} MTU) - 20/40(IPv4/IPv6)
     * - 8(UDP) - some reserve (the MTU of Ethernet is currently independent
     * of its speed variant)
     */
    const epics::pvData::int32 MAX_UDP_UNFRAGMENTED_SEND = 1440;
    
	 /**
	  * UDP maximum receive message size.
	  * MAX_UDP: 65535 (max UDP packet size) - 20/40(IPv4/IPv6) - 8(UDP)
	  */
    const epics::pvData::int32 MAX_UDP_RECV = 65487;
    
    /** TCP maximum receive message size. */
    const epics::pvData::int32 MAX_TCP_RECV = 1024*16;
    
    /** Maximum number of search requests in one search message. */
    const epics::pvData::int32 MAX_SEARCH_BATCH_COUNT = 0x7FFF;  // 32767
    
    /** Default priority (corresponds to POSIX SCHED_OTHER) */
    const epics::pvData::int16 PVA_DEFAULT_PRIORITY = 0;
    
    /** Unreasonable channel name length. */
    const epics::pvData::uint32 MAX_CHANNEL_NAME_LENGTH = 500;
    
    /** Invalid data type. */
    const epics::pvData::int16 INVALID_DATA_TYPE = 0xFFFF;
    
    /** Invalid IOID. */
    const epics::pvData::int32 INVALID_IOID = 0;
    
    /** Default PVA provider name. */
    const epics::pvData::String PVACCESS_DEFAULT_PROVIDER = "local";

    /** "All-providers registered" PVA provider name. */
    const epics::pvData::String PVACCESS_ALL_PROVIDERS = "<all>";

    /** Name of the system env. variable to turn on debugging. */
    const epics::pvData::String PVACCESS_DEBUG = "EPICS_PVA_DEBUG";
}
}

#endif /* PVACONSTANTS_H_ */