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1190ff8380b1a34eb386bcdbb4a0096e5ea1b0f9
bacnet_stack/bacnet-stack/npdu.c
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skarg 1190ff8380 Adding code to support NPDU.
2005-03-14 00:04:57 +00:00

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/*####COPYRIGHTBEGIN####
-------------------------------------------
Copyright (C) 2005 Steve Karg
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
The Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA.
As a special exception, if other files instantiate templates or
use macros or inline functions from this file, or you compile
this file and link it with other works to produce a work based
on this file, this file does not by itself cause the resulting
work to be covered by the GNU General Public License. However
the source code for this file must still be made available in
accordance with section (3) of the GNU General Public License.
This exception does not invalidate any other reasons why a work
based on this file might be covered by the GNU General Public
License.
-------------------------------------------
####COPYRIGHTEND####*/
#include <stdbool.h>
#include <stdint.h>
#include <assert.h>
#include "bacdef.h"
#include "bacenum.h"
#include "bits.h"
/* max-segments-accepted
B'000' Unspecified number of segments accepted.
B'001' 2 segments accepted.
B'010' 4 segments accepted.
B'011' 8 segments accepted.
B'100' 16 segments accepted.
B'101' 32 segments accepted.
B'110' 64 segments accepted.
B'111' Greater than 64 segments accepted.
*/
/* max-APDU-length-accepted
B'0000' Up to MinimumMessageSize (50 octets)
B'0001' Up to 128 octets
B'0010' Up to 206 octets (fits in a LonTalk frame)
B'0011' Up to 480 octets (fits in an ARCNET frame)
B'0100' Up to 1024 octets
B'0101' Up to 1476 octets (fits in an ISO 8802-3 frame)
B'0110' reserved by ASHRAE
B'0111' reserved by ASHRAE
B'1000' reserved by ASHRAE
B'1001' reserved by ASHRAE
B'1010' reserved by ASHRAE
B'1011' reserved by ASHRAE
B'1100' reserved by ASHRAE
B'1101' reserved by ASHRAE
B'1110' reserved by ASHRAE
B'1111' reserved by ASHRAE
*/
uint8_t npdu_encode_max_seg_max_apdu(int max_segs, int max_apdu)
{
uint8_t octet = 0;
if (max_segs < 2)
octet = 0;
else if (max_segs < 4)
octet = 0x10;
else if (max_segs < 8)
octet = 0x20;
else if (max_segs < 16)
octet = 0x30;
else if (max_segs < 32)
octet = 0x40;
else if (max_segs < 64)
octet = 0x50;
else if (max_segs == 64)
octet = 0x60;
else
octet = 0x70;
// max_apdu must be 50 octets minimum
assert(max_apdu >= 50);
if (max_apdu == 50)
octet |= 0x00;
else if (max_apdu <= 128)
octet |= 0x01;
//fits in a LonTalk frame
else if (max_apdu <= 206)
octet |= 0x02;
//fits in an ARCNET or MS/TP frame
else if (max_apdu <= 480)
octet |= 0x03;
else if (max_apdu <= 1024)
octet |= 0x04;
// fits in an ISO 8802-3 frame
else if (max_apdu <= 1476)
octet |= 0x05;
return octet;
}
int npdu_encode_raw(
uint8_t *npdu,
BACNET_ADDRESS *dest,
BACNET_ADDRESS *src,
bool data_expecting_reply, // true for confirmed messages
bool network_layer_message, // false if APDU
BACNET_NETWORK_MESSAGE_TYPE network_message_type, // optional
uint16_t vendor_id, // optional, if net message type is > 0x80
BACNET_MESSAGE_PRIORITY priority,
uint8_t invoke_id)
{
int len = 0; // return value - number of octets loaded in this function
int i = 0; // counter
if (npdu)
{
// Protocol Version
npdu[0] = 1;
// control octet
npdu[1] = 0;
// Bit 7: 1 indicates that the NSDU conveys a network layer message.
// Message Type field is present.
// 0 indicates that the NSDU contains a BACnet APDU.
// Message Type field is absent.
if (network_layer_message)
npdu[1] |= BIT7;
//Bit 6: Reserved. Shall be zero.
//Bit 5: Destination specifier where:
// 0 = DNET, DLEN, DADR, and Hop Count absent
// 1 = DNET, DLEN, and Hop Count present
// DLEN = 0 denotes broadcast MAC DADR and DADR field is absent
// DLEN > 0 specifies length of DADR field
if (dest->net)
npdu[1] |= BIT5;
// Bit 4: Reserved. Shall be zero.
// Bit 3: Source specifier where:
// 0 = SNET, SLEN, and SADR absent
// 1 = SNET, SLEN, and SADR present
// SLEN = 0 Invalid
// SLEN > 0 specifies length of SADR field
if (src->net)
npdu[1] |= BIT3;
// Bit 2: The value of this bit corresponds to the data_expecting_reply
// parameter in the N-UNITDATA primitives.
// 1 indicates that a BACnet-Confirmed-Request-PDU,
// a segment of a BACnet-ComplexACK-PDU,
// or a network layer message expecting a reply is present.
// 0 indicates that other than a BACnet-Confirmed-Request-PDU,
// a segment of a BACnet-ComplexACK-PDU,
// or a network layer message expecting a reply is present.
if (data_expecting_reply)
npdu[1] |= BIT2;
// Bits 1,0: Network priority where:
// B'11' = Life Safety message
// B'10' = Critical Equipment message
// B'01' = Urgent message
// B'00' = Normal message
npdu[1] |= (priority & 0x03);
len = 2;
if (dest->net)
{
len += encode_bacnet_unsigned16(&npdu[len], dest->net);
// DLEN = 0 denotes broadcast MAC DADR and DADR field is absent
// DLEN > 0 specifies length of DADR field
if (dest->adr_len)
{
npdu[len] = dest->adr_len;
len++;
for (i = 0; i < dest->adr_len; i++)
{
npdu[len] = dest->adr[i];
len++;
}
}
}
if (src->net)
{
len += encode_bacnet_unsigned16(&npdu[len], src->net);
// SLEN = 0 denotes broadcast MAC SADR and SADR field is absent
// SLEN > 0 specifies length of SADR field
if (src->adr_len)
{
npdu[len] = src->adr_len;
len++;
for (i = 0; i < src->adr_len; i++)
{
npdu[len] = src->adr[i];
len++;
}
}
}
// The Hop Count field shall be present only if the message is
// destined for a remote network, i.e., if DNET is present.
// This is a one-octet field that is initialized to a value of 0xff.
if (dest->net)
{
npdu[len] = 0xFF;
len++;
}
if (network_layer_message)
{
npdu[len] = network_message_type;
len++;
// Message Type field contains a value in the range 0x80 - 0xFF,
// then a Vendor ID field shall be present
if (network_message_type >= 0x80)
len += encode_bacnet_unsigned16(&npdu[len], vendor_id);
}
}
return len;
}
// encode the NPDU portion of the packet for an APDU
int npdu_encode_apdu(
uint8_t *npdu,
BACNET_ADDRESS *dest,
BACNET_ADDRESS *src,
bool data_expecting_reply, // true for confirmed messages
BACNET_MESSAGE_PRIORITY priority,
uint8_t invoke_id)
{
return npdu_encode_raw(npdu,dest,src,data_expecting_reply,
false,0,0,priority,invoke_id);
}
#ifdef TEST
#include <assert.h>
#include <string.h>
#include "ctest.h"
void testNPDU(Test * pTest)
{
uint8_t pdu[480] = {0};
BACNET_ADDRESS dest = {0};
BACNET_ADDRESS src = {0};
int len = 0;
bool data_expecting_reply = false; // true for confirmed messages
BACNET_MESSAGE_PRIORITY priority = MESSAGE_PRIORITY_NORMAL;
uint8_t invoke_id = 1;
dest.mac_len = 0;
for (i = 0; i < MAX_MAC_LEN; i++)
{
dest.mac[i] = 0;
}
dest.net = 0;
dest.adr_len = 0;
for (i = 0; i < MAX_MAC_LEN; i++)
{
dest.adr[i] = 0;
}
len = ndpu_encode_apdu(
&pdu[0],
&dest,
&src,
data_expecting_reply,
priority,
invoke_id)
ct_test(pTest, len != 0);
}
#ifdef TEST_NPDU
int main(void)
{
Test *pTest;
bool rc;
pTest = ct_create("BACnet NPDU", NULL);
/* individual tests */
rc = ct_addTestFunction(pTest, testNPDU);
assert(rc);
ct_setStream(pTest, stdout);
ct_run(pTest);
(void) ct_report(pTest);
ct_destroy(pTest);
return 0;
}
#endif /* TEST_NPDU */
#endif /* TEST */
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