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bacnet_stack/bacnet-stack/ports/linux/dlmstp.c
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/**************************************************************************
*
* Copyright (C) 2007 Steve Karg <skarg@users.sourceforge.net>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*********************************************************************/
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
/* Linux Includes */
#include <sched.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
/* project includes */
#include "bacdef.h"
#include "mstp.h"
#include "dlmstp.h"
#include "rs485.h"
#include "npdu.h"
/* Number of MS/TP Packets Rx/Tx */
uint16_t MSTP_Packets = 0;
/* Sockets are used for NPDU queues */
static int Receive_Client_SockFD = -1;
static int Transmit_Client_SockFD = -1;
static int Receive_Server_SockFD = -1;
static int Transmit_Server_SockFD = -1;
/* local MS/TP port data - shared with RS-485 */
volatile struct mstp_port_struct_t MSTP_Port;
/* buffers needed by mstp port struct */
static uint8_t TxBuffer[MAX_MPDU];
static uint8_t RxBuffer[MAX_MPDU];
#define INCREMENT_AND_LIMIT_UINT16(x) {if (x < 0xFFFF) x++;}
void dlmstp_millisecond_timer(void)
{
INCREMENT_AND_LIMIT_UINT16(MSTP_Port.SilenceTimer);
}
static void *dlmstp_milliseconds_task(void *pArg)
{
struct timespec timeOut,remains;
timeOut.tv_sec = 0;
timeOut.tv_nsec = 1000000; /* 1 millisecond */
for (;;) {
nanosleep(&timeOut, &remains);
dlmstp_millisecond_timer();
}
return NULL;
}
void dlmstp_reinit(void)
{
//RS485_Reinit();
dlmstp_set_mac_address(DEFAULT_MAC_ADDRESS);
dlmstp_set_max_info_frames(DEFAULT_MAX_INFO_FRAMES);
dlmstp_set_max_master(DEFAULT_MAX_MASTER);
}
/* returns number of bytes sent on success, zero on failure */
int dlmstp_send_pdu(BACNET_ADDRESS * dest, /* destination address */
BACNET_NPDU_DATA * npdu_data, /* network information */
uint8_t * pdu, /* any data to be sent - may be null */
unsigned pdu_len)
{ /* number of bytes of data */
DLMSTP_PACKET packet;
int bytes_sent = 0;
ssize_t rc = 0;
if (pdu_len) {
if (npdu_data->data_expecting_reply) {
packet.frame_type =
FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY;
} else {
packet.frame_type =
FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY;
}
packet.pdu_len = pdu_len;
memmove(&packet.pdu[0], &pdu[0], pdu_len);
memmove(&packet.address, dest, sizeof(packet.address));
rc = write(Transmit_Server_SockFD, &packet, sizeof(packet));
if (rc > 0)
bytes_sent = rc;
}
return bytes_sent;
}
/* copy the packet if one is received.
Return the length of the packet */
uint16_t dlmstp_receive(
BACNET_ADDRESS * src, /* source address */
uint8_t * pdu, /* PDU data */
uint16_t max_pdu, /* amount of space available in the PDU */
unsigned timeout) /* milliseconds to wait for a packet */
{
uint16_t pdu_len = 0;
int received_bytes = 0;
DLMSTP_PACKET packet;
struct timeval select_timeout;
fd_set read_fds;
int max = 0;
/* Make sure the socket is open */
if (Receive_Client_SockFD <= 0)
return 0;
if (timeout >= 1000) {
select_timeout.tv_sec = timeout / 1000;
select_timeout.tv_usec =
1000 * (timeout - select_timeout.tv_sec * 1000);
} else {
select_timeout.tv_sec = 0;
select_timeout.tv_usec = 1000 * timeout;
}
FD_ZERO(&read_fds);
FD_SET(Receive_Client_SockFD, &read_fds);
max = Receive_Client_SockFD;
if (select(max + 1, &read_fds, NULL, NULL, &select_timeout) > 0) {
received_bytes = read(
Receive_Client_SockFD,
&packet,
sizeof(packet));
} else {
return 0;
}
/* See if there is a problem */
if (received_bytes < 0) {
/* EAGAIN Non-blocking I/O has been selected */
/* using O_NONBLOCK and no data */
/* was immediately available for reading. */
if (errno != EAGAIN) {
#if PRINT_ENABLED
fprintf(stderr,
"mstp: Read error in Receive_Client packet: %s\n",
strerror(errno));
#endif
}
return 0;
}
if (received_bytes == 0)
return 0;
/* copy the buffer into the PDU */
pdu_len = packet.pdu_len;
memmove(&pdu[0], &packet.pdu[0], pdu_len);
memmove(src, &packet.address, sizeof(packet.address));
/* not used in this scheme */
packet.ready = true;
return pdu_len;
}
static void *dlmstp_fsm_receive_task(void *pArg)
{
bool received_frame = false;
for (;;) {
/* only do receive state machine while we don't have a frame */
if ((MSTP_Port.ReceivedValidFrame == false) &&
(MSTP_Port.ReceivedInvalidFrame == false)) {
do {
/* using blocking read with timeout on serial port */
RS485_Check_UART_Data(&MSTP_Port);
MSTP_Receive_Frame_FSM(&MSTP_Port);
received_frame = MSTP_Port.ReceivedValidFrame ||
MSTP_Port.ReceivedInvalidFrame;
if (received_frame)
break;
} while (MSTP_Port.DataAvailable);
}
}
return NULL;
}
static void *dlmstp_fsm_master_task(void *pArg)
{
struct timespec timeOut,remains;
timeOut.tv_sec = 0;
timeOut.tv_nsec = 100000; /* .1 millisecond */
for (;;) {
nanosleep(&timeOut, &remains);
/* only do master state machine while rx is idle */
if (MSTP_Port.receive_state == MSTP_RECEIVE_STATE_IDLE) {
while (MSTP_Master_Node_FSM(&MSTP_Port)) {
sched_yield();
}
}
}
return NULL;
}
void dlmstp_fill_bacnet_address(BACNET_ADDRESS * src, uint8_t mstp_address)
{
int i = 0;
if (mstp_address == MSTP_BROADCAST_ADDRESS) {
/* mac_len = 0 if broadcast address */
src->mac_len = 0;
src->mac[0] = 0;
} else {
src->mac_len = 1;
src->mac[0] = mstp_address;
}
/* fill with 0's starting with index 1; index 0 filled above */
for (i = 1; i < MAX_MAC_LEN; i++) {
src->mac[i] = 0;
}
src->net = 0;
src->len = 0;
for (i = 0; i < MAX_MAC_LEN; i++) {
src->adr[i] = 0;
}
}
/* for the MS/TP state machine to use for putting received data */
uint16_t MSTP_Put_Receive(
volatile struct mstp_port_struct_t *mstp_port)
{
DLMSTP_PACKET packet;
uint16_t pdu_len = mstp_port->DataLength;
/* bounds check - maybe this should send an abort? */
if (pdu_len > sizeof(packet.pdu))
pdu_len = sizeof(packet.pdu);
if (pdu_len) {
MSTP_Packets++;
memmove(&packet.pdu[0],
(void *) & mstp_port->InputBuffer[0],
pdu_len);
dlmstp_fill_bacnet_address(&packet.address,
mstp_port->SourceAddress);
packet.pdu_len = pdu_len;
/* ready is not used in this scheme */
packet.ready = true;
write(Receive_Server_SockFD, &packet, sizeof(packet));
}
return pdu_len;
}
/* for the MS/TP state machine to use for getting data to send */
/* Return: amount of PDU data */
uint16_t MSTP_Get_Send(
uint8_t src, /* source MS/TP address for creating packet */
uint8_t * pdu, /* data to send */
uint16_t max_pdu, /* amount of space available */
unsigned timeout) /* milliseconds to wait for a packet */
{
uint16_t pdu_len = 0; /* return value */
int received_bytes = 0;
DLMSTP_PACKET packet;
struct timeval select_timeout;
fd_set read_fds;
int max = 0;
uint8_t destination = 0; /* destination address */
/* Make sure the socket is open */
if (Transmit_Client_SockFD <= 0)
return 0;
if (timeout >= 1000) {
select_timeout.tv_sec = timeout / 1000;
select_timeout.tv_usec =
1000 * (timeout - select_timeout.tv_sec * 1000);
} else {
select_timeout.tv_sec = 0;
select_timeout.tv_usec = 1000 * timeout;
}
FD_ZERO(&read_fds);
FD_SET(Transmit_Client_SockFD, &read_fds);
max = Transmit_Client_SockFD;
if (select(max + 1, &read_fds, NULL, NULL, &select_timeout) > 0) {
received_bytes = read(
Transmit_Client_SockFD,
&packet,
sizeof(packet));
} else {
return 0;
}
/* See if there is a problem */
if (received_bytes < 0) {
/* EAGAIN Non-blocking I/O has been selected */
/* using O_NONBLOCK and no data */
/* was immediately available for reading. */
if (errno != EAGAIN) {
#if PRINT_ENABLED
fprintf(stderr,
"mstp: Read error in Transmit_Client packet: %s\n",
strerror(errno));
#endif
}
return 0;
}
if (received_bytes == 0)
return 0;
/* load destination MAC address */
if (packet.address.mac_len == 1) {
destination = packet.address.mac[0];
} else {
return 0;
}
if ((8 /* header len */ + packet.pdu_len) > MAX_MPDU) {
return 0;
}
/* convert the PDU into the MSTP Frame */
pdu_len = MSTP_Create_Frame(
pdu, /* <-- loading this */
max_pdu,
packet.frame_type,
destination, src,
&packet.pdu[0],
packet.pdu_len);
return pdu_len;
}
void dlmstp_set_mac_address(uint8_t mac_address)
{
/* Master Nodes can only have address 0-127 */
if (mac_address <= 127) {
MSTP_Port.This_Station = mac_address;
/* FIXME: implement your data storage */
/* I2C_Write_Byte(
EEPROM_DEVICE_ADDRESS,
mac_address,
EEPROM_MSTP_MAC_ADDR); */
if (mac_address > MSTP_Port.Nmax_master)
dlmstp_set_max_master(mac_address);
}
return;
}
uint8_t dlmstp_my_address(void)
{
return MSTP_Port.This_Station;
}
/* This parameter represents the value of the Max_Info_Frames property of */
/* the node's Device object. The value of Max_Info_Frames specifies the */
/* maximum number of information frames the node may send before it must */
/* pass the token. Max_Info_Frames may have different values on different */
/* nodes. This may be used to allocate more or less of the available link */
/* bandwidth to particular nodes. If Max_Info_Frames is not writable in a */
/* node, its value shall be 1. */
void dlmstp_set_max_info_frames(uint8_t max_info_frames)
{
if (max_info_frames >= 1) {
MSTP_Port.Nmax_info_frames = max_info_frames;
/* FIXME: implement your data storage */
/* I2C_Write_Byte(
EEPROM_DEVICE_ADDRESS,
(uint8_t)max_info_frames,
EEPROM_MSTP_MAX_INFO_FRAMES_ADDR); */
}
return;
}
uint8_t dlmstp_max_info_frames(void)
{
return MSTP_Port.Nmax_info_frames;
}
/* This parameter represents the value of the Max_Master property of the */
/* node's Device object. The value of Max_Master specifies the highest */
/* allowable address for master nodes. The value of Max_Master shall be */
/* less than or equal to 127. If Max_Master is not writable in a node, */
/* its value shall be 127. */
void dlmstp_set_max_master(uint8_t max_master)
{
if (max_master <= 127) {
if (MSTP_Port.This_Station <= max_master) {
MSTP_Port.Nmax_master = max_master;
/* FIXME: implement your data storage */
/* I2C_Write_Byte(
EEPROM_DEVICE_ADDRESS,
max_master,
EEPROM_MSTP_MAX_MASTER_ADDR); */
}
}
return;
}
uint8_t dlmstp_max_master(void)
{
return MSTP_Port.Nmax_master;
}
void dlmstp_get_my_address(BACNET_ADDRESS * my_address)
{
int i = 0; /* counter */
my_address->mac_len = 1;
my_address->mac[0] = MSTP_Port.This_Station;
my_address->net = 0; /* local only, no routing */
my_address->len = 0;
for (i = 0; i < MAX_MAC_LEN; i++) {
my_address->adr[i] = 0;
}
return;
}
void dlmstp_get_broadcast_address(BACNET_ADDRESS * dest)
{ /* destination address */
int i = 0; /* counter */
if (dest) {
dest->mac_len = 1;
dest->mac[0] = MSTP_BROADCAST_ADDRESS;
dest->net = BACNET_BROADCAST_NETWORK;
dest->len = 0; /* always zero when DNET is broadcast */
for (i = 0; i < MAX_MAC_LEN; i++) {
dest->adr[i] = 0;
}
}
return;
}
/* RS485 Baud Rate 9600, 19200, 38400, 57600, 115200 */
void dlmstp_set_baud_rate(uint32_t baud)
{
RS485_Set_Baud_Rate(baud);
}
uint32_t dlmstp_baud_rate(void)
{
return RS485_Get_Baud_Rate();
}
static int create_named_server_socket (const char *filename)
{
struct sockaddr_un name;
int sock;
size_t size;
/* Create the socket. */
sock = socket (PF_LOCAL, SOCK_DGRAM, 0);
if (sock < 0) {
#if PRINT_ENABLED
perror ("socket");
#endif
exit (EXIT_FAILURE);
}
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &sock, sizeof(sock));
/* Bind a name to the socket. */
name.sun_family = AF_LOCAL;
strncpy (name.sun_path, filename, sizeof (name.sun_path));
/* The size of the address is
the offset of the start of the filename,
plus its length,
plus one for the terminating null byte.
Alternatively you can just do:
size = SUN_LEN (&name);
*/
size = (offsetof (struct sockaddr_un, sun_path)
+ strlen (name.sun_path) + 1);
if (bind (sock, (struct sockaddr *) &name, size) < 0) {
#if PRINT_ENABLED
perror ("bind");
#endif
exit (EXIT_FAILURE);
}
return sock;
}
/* used by the client */
static int connect_named_server_socket (const char *filename)
{
struct sockaddr_un name;
int sock;
size_t size;
/* Create the socket. */
sock = socket (PF_LOCAL, SOCK_DGRAM, 0);
if (sock < 0) {
#if PRINT_ENABLED
perror ("socket");
#endif
exit (EXIT_FAILURE);
}
strncpy (name.sun_path, filename, sizeof (name.sun_path));
/* The size of the address is
the offset of the start of the filename,
plus its length,
plus one for the terminating null byte.
Alternatively you can just do:
size = SUN_LEN (&name);
*/
size = (offsetof (struct sockaddr_un, sun_path)
+ strlen (name.sun_path) + 1);
if (connect(sock, (struct sockaddr *) &name, size) < 0) {
#if PRINT_ENABLED
perror ("client: can't connect to socket");
#endif
exit (EXIT_FAILURE);
}
return sock;
}
static char *dlmstp_transmit_socket_name = "/tmp/BACnet_MSTP_Tx";
static char *dlmstp_receive_socket_name = "/tmp/BACnet_MSTP_Rx";
void dlmstp_cleanup(void)
{
remove(dlmstp_transmit_socket_name);
remove(dlmstp_receive_socket_name);
RS485_Cleanup();
/* nothing to do for static buffers */
}
bool dlmstp_init(char *ifname)
{
int rc = 0;
pthread_t hThread;
remove(dlmstp_transmit_socket_name);
remove(dlmstp_receive_socket_name);
/* create a socket for queuing the NDPU data between MS/TP */
Transmit_Server_SockFD =
create_named_server_socket(dlmstp_transmit_socket_name);
Transmit_Client_SockFD =
connect_named_server_socket(dlmstp_transmit_socket_name);
/* creates sockets for Receiving data */
Receive_Server_SockFD =
create_named_server_socket(dlmstp_receive_socket_name);
Receive_Client_SockFD =
connect_named_server_socket(dlmstp_receive_socket_name);
/* initialize hardware */
if (ifname) {
RS485_Set_Interface(ifname);
#if PRINT_ENABLED
fprintf(stderr,"MS/TP Interface: %s\n", ifname);
#endif
}
RS485_Initialize();
MSTP_Port.InputBuffer = &RxBuffer[0];
MSTP_Port.InputBufferSize = sizeof(RxBuffer);
MSTP_Port.OutputBuffer = &TxBuffer[0];
MSTP_Port.OutputBufferSize = sizeof(TxBuffer);
MSTP_Init(&MSTP_Port);
#if 0
/* FIXME: implement your data storage */
if (data <= 127)
MSTP_Port.This_Station = data;
else
dlmstp_set_mac_address(DEFAULT_MAC_ADDRESS);
if ((data <= 127) && (data >= MSTP_Port.This_Station))
MSTP_Port.Nmax_master = data;
else
dlmstp_set_max_master(DEFAULT_MAX_MASTER);
if (data >= 1)
MSTP_Port.Nmax_info_frames = data;
else
dlmstp_set_max_info_frames(DEFAULT_MAX_INFO_FRAMES);
#endif
#if PRINT_ENABLED
fprintf(stderr,"MS/TP MAC: %02X\n",
MSTP_Port.This_Station);
fprintf(stderr,"MS/TP Max_Master: %02X\n",
MSTP_Port.Nmax_master);
fprintf(stderr,"MS/TP Max_Info_Frames: %u\n",
MSTP_Port.Nmax_info_frames);
#endif
/* start our MilliSec task */
rc = pthread_create(&hThread, NULL, dlmstp_milliseconds_task, NULL);
rc = pthread_create(&hThread, NULL, dlmstp_fsm_receive_task, NULL);
rc = pthread_create(&hThread, NULL, dlmstp_fsm_master_task, NULL);
return 1;
}
#ifdef TEST_DLMSTP
#include <stdio.h>
static char *Network_Interface = NULL;
int main(int argc, char *argv[])
{
uint16_t bytes_received = 0;
BACNET_ADDRESS src; /* source address */
uint8_t pdu[MAX_APDU]; /* PDU data */
#if (defined(MSTP_TEST_REQUEST) && MSTP_TEST_REQUEST)
struct timespec timeOut, remains;
timeOut.tv_sec = 1;
timeOut.tv_nsec = 0; /* 1 millisecond */
#endif
/* argv has the "/dev/ttyS0" or some other device */
if (argc > 1) {
Network_Interface = argv[1];
}
dlmstp_set_baud_rate(38400);
dlmstp_set_mac_address(0x05);
dlmstp_set_max_info_frames(DEFAULT_MAX_INFO_FRAMES);
dlmstp_set_max_master(DEFAULT_MAX_MASTER);
dlmstp_init(Network_Interface);
/* forever task */
for (;;) {
#if (defined(MSTP_TEST_REQUEST) && MSTP_TEST_REQUEST)
MSTP_Create_And_Send_Frame(
&MSTP_Port,
FRAME_TYPE_TEST_REQUEST,
MSTP_Port.SourceAddress,
MSTP_Port.This_Station,
NULL, 0);
nanosleep(&timeOut, &remains);
#endif
bytes_received =
dlmstp_receive(&src, &pdu[0], sizeof(pdu), 0);
if (bytes_received) {
fprintf(stderr,"Received NPDU!\n");
}
}
return 0;
}
#endif
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