int BacnetAtomicReadFile(
int deviceInstanceNumber,
int fileInstanceNumber,
int startOffset,
int numBytes)
{
if (!isAtomicReadFileHandlerRegistered) {
/* handle the data coming back from confirmed requests */
apdu_set_confirmed_ack_handler(SERVICE_CONFIRMED_ATOMIC_READ_FILE,
AtomicReadFileAckHandler);
/* handle any errors coming back */
apdu_set_error_handler(SERVICE_CONFIRMED_ATOMIC_READ_FILE,
My_Error_Handler);
/* indicate that handlers are now registered */
isAtomicReadFileHandlerRegistered = true;
}
/* Send the message out */
Request_Invoke_ID =
Send_Atomic_Read_File_Stream(deviceInstanceNumber, fileInstanceNumber,
startOffset, numBytes);
Wait_For_Answer_Or_Timeout(100, waitAnswer);
int isFailure = Error_Detected;
Error_Detected = 0;
return isFailure;
}
int main(
int argc,
char *argv[])
{
BACNET_ADDRESS src = {
0
}; /* address where message came from */
uint16_t pdu_len = 0;
unsigned timeout = 100; /* milliseconds */
unsigned max_apdu = 0;
time_t elapsed_seconds = 0;
time_t last_seconds = 0;
time_t current_seconds = 0;
time_t timeout_seconds = 0;
int fileStartPosition = 0;
unsigned requestedOctetCount = 0;
uint8_t invoke_id = 0;
bool found = false;
uint16_t my_max_apdu = 0;
if (argc < 4) {
/* FIXME: what about access method - record or stream? */
printf("%s device-instance file-instance local-name\r\n",
filename_remove_path(argv[0]));
return 0;
}
/* decode the command line parameters */
Target_Device_Object_Instance = strtol(argv[1], NULL, 0);
Target_File_Object_Instance = strtol(argv[2], NULL, 0);
Local_File_Name = argv[3];
if (Target_Device_Object_Instance >= BACNET_MAX_INSTANCE) {
fprintf(stderr, "device-instance=%u - it must be less than %u\r\n",
Target_Device_Object_Instance, BACNET_MAX_INSTANCE);
return 1;
}
if (Target_File_Object_Instance >= BACNET_MAX_INSTANCE) {
fprintf(stderr, "file-instance=%u - it must be less than %u\r\n",
Target_File_Object_Instance, BACNET_MAX_INSTANCE + 1);
return 1;
}
/* setup my info */
Device_Set_Object_Instance_Number(BACNET_MAX_INSTANCE);
address_init();
Init_Service_Handlers();
dlenv_init();
atexit(datalink_cleanup);
/* configure the timeout values */
last_seconds = time(NULL);
timeout_seconds = (apdu_timeout() / 1000) * apdu_retries();
/* try to bind with the device */
Send_WhoIs(Target_Device_Object_Instance, Target_Device_Object_Instance);
/* loop forever */
for (;;) {
/* increment timer - exit if timed out */
current_seconds = time(NULL);
/* returns 0 bytes on timeout */
pdu_len = datalink_receive(&src, &Rx_Buf[0], MAX_MPDU, timeout);
/* process */
if (pdu_len) {
npdu_handler(&src, &Rx_Buf[0], pdu_len);
}
/* at least one second has passed */
if (current_seconds != last_seconds) {
tsm_timer_milliseconds(((current_seconds - last_seconds) * 1000));
}
/* wait until the device is bound, or timeout and quit */
found =
address_bind_request(Target_Device_Object_Instance, &max_apdu,
&Target_Address);
if (found) {
/* calculate the smaller of our APDU size or theirs
and remove the overhead of the APDU (about 16 octets max).
note: we could fail if there is a bottle neck (router)
and smaller MPDU in betweeen. */
if (max_apdu < MAX_APDU) {
my_max_apdu = max_apdu;
} else {
my_max_apdu = MAX_APDU;
}
/* Typical sizes are 50, 128, 206, 480, 1024, and 1476 octets */
if (my_max_apdu <= 50) {
requestedOctetCount = my_max_apdu - 20;
} else if (my_max_apdu <= 480) {
requestedOctetCount = my_max_apdu - 32;
} else if (my_max_apdu <= 1476) {
requestedOctetCount = my_max_apdu - 64;
} else {
requestedOctetCount = my_max_apdu / 2;
}
/* has the previous invoke id expired or returned?
note: invoke ID = 0 is invalid, so it will be idle */
if ((invoke_id == 0) || tsm_invoke_id_free(invoke_id)) {
if (End_Of_File_Detected || Error_Detected) {
break;
}
if (invoke_id != 0) {
fileStartPosition += requestedOctetCount;
}
/* we'll read the file in chunks
less than max_apdu to keep unsegmented */
invoke_id =
Send_Atomic_Read_File_Stream(Target_Device_Object_Instance,
Target_File_Object_Instance, fileStartPosition,
requestedOctetCount);
Current_Invoke_ID = invoke_id;
} else if (tsm_invoke_id_failed(invoke_id)) {
fprintf(stderr, "\rError: TSM Timeout!\r\n");
tsm_free_invoke_id(invoke_id);
/* try again or abort? */
Error_Detected = true;
break;
}
} else {
/* increment timer - exit if timed out */
elapsed_seconds += (current_seconds - last_seconds);
if (elapsed_seconds > timeout_seconds) {
fprintf(stderr, "\rError: APDU Timeout!\r\n");
Error_Detected = true;
break;
}
}
/* keep track of time for next check */
last_seconds = current_seconds;
}
if (Error_Detected) {
return 1;
}
return 0;
}
