* - Remember, the coke machine echoes your text back to you!
*/
#include "common.h"
+#include "../common/config.h"
#include <stdio.h>
#include <string.h>
+#include <stdarg.h>
+#include <pthread.h>
#include <unistd.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <regex.h>
+#include <modbus/modbus.h>
+#include <errno.h>
-#define READ_TIMEOUT 2 // 2 seconds for ReadChar
-#define TRACE_COKE 1
+#define MIN_DISPENSE_PERIOD 2
+#define COKE_RECONNECT_RATELIMIT 2
+
+// === CONSTANTS ===
+const int ciCoke_MinPeriod = 5;
+const int ciCoke_DropBitBase = 1024;
+const int ciCoke_StatusBitBase = 16;
// === IMPORTS ===
int Coke_InitHandler();
int Coke_CanDispense(int User, int Item);
int Coke_DoDispense(int User, int Item);
- int Writef(const char *Format, ...);
- int WaitForColon();
- int ReadLine(int len, char *output);
+ int Coke_int_ConnectToPLC(void);
+ int Coke_int_GetSlotFromItem(int Item, int bDispensing);
+ int Coke_int_IsSlotEmpty(int Slot);
+ int Coke_int_DropSlot(int Slot);
+static int _ReadBit(int BitNum, uint8_t *Value);
+static int _WriteBit(int BitNum, uint8_t Value);
// === GLOBALS ===
tHandler gCoke_Handler = {
Coke_CanDispense,
Coke_DoDispense
};
-char *gsCoke_SerialPort = "/dev/ttyS0";
- int giCoke_SerialFD;
-regex_t gCoke_StatusRegex;
+const char *gsCoke_ModbusAddress = "130.95.13.73";
+modbus_t *gCoke_Modbus;
+time_t gtCoke_LastDispenseTime;
+time_t gtCoke_LastReconnectTime;
+ int gbCoke_DummyMode = 1;
+ int giCoke_NextCokeSlot = 0;
// == CODE ===
int Coke_InitHandler()
{
- printf("connecting to coke machine...\n");
-
- giCoke_SerialFD = InitSerial(gsCoke_SerialPort, 9600);
- if( giCoke_SerialFD == -1 ) {
- fprintf(stderr, "ERROR: Unable to open coke serial port ('%s')\n", gsCoke_SerialPort);
+ // Configuable dummy/blank mode (all dispenses succeed)
+ // TODO: Find a better way of handling missing/invalid options
+ if( Config_GetValueCount("coke_dummy_mode") > 0 )
+ {
+ gbCoke_DummyMode = Config_GetValue_Bool("coke_dummy_mode", 0);
+ if(gbCoke_DummyMode == -1) gbCoke_DummyMode = 0;
}
- else {
- // Reset the slot names.
- // - Dunno why this is needed, but the machine plays silly
- // sometimes.
- Writef("n0 Slot0\n");
- WaitForColon();
- Writef("n1 Slot1\n");
- WaitForColon();
- Writef("n2 Slot2\n");
- WaitForColon();
- Writef("n3 Slot3\n");
- WaitForColon();
- Writef("n4 Slot4\n");
- WaitForColon();
- Writef("n5 Slot5\n");
- WaitForColon();
- Writef("n6 Coke\n");
+
+ // Open modbus
+ if( !gbCoke_DummyMode )
+ {
+ Coke_int_ConnectToPLC();
}
-
- CompileRegex(&gCoke_StatusRegex, "^slot\\s+([0-9]+)\\s+([^:]+):([a-zA-Z]+)\\s*", REG_EXTENDED);
+
return 0;
}
int Coke_CanDispense(int UNUSED(User), int Item)
{
- char tmp[40], *status;
- regmatch_t matches[4];
- int ret;
-
- // Sanity please
- if( Item < 0 || Item > 6 ) return -1; // -EYOURBAD
-
- // Can't dispense if the machine is not connected
- if( giCoke_SerialFD == -1 )
- return -2;
-
- #if TRACE_COKE
- printf("Coke_CanDispense: Flushing\n");
- #endif
+ int slot;
+ // Check for 'dummy' mode
+ if( gbCoke_DummyMode )
+ return 0;
+
+ // Get slot
+ slot = Coke_int_GetSlotFromItem(Item, 0);
+ if(slot < 0) return -1;
+
+ return Coke_int_IsSlotEmpty(slot);
+}
+
+/**
+ * \brief Actually do a dispense from the coke machine
+ */
+int Coke_DoDispense(int UNUSED(User), int Item)
+{
+ int slot;
+ // Check for 'dummy' mode
+ if( gbCoke_DummyMode )
+ return 0;
+
+ // Get slot
+ slot = Coke_int_GetSlotFromItem(Item, 1);
+ if(slot < 0) return -1;
- // Wait for a prompt
- ret = 0;
- while( WaitForColon() && ret < 3 )
+ // Make sure there are not two dispenses within n seconds
+ if( time(NULL) - gtCoke_LastDispenseTime < ciCoke_MinPeriod )
{
- // Flush the input buffer
- char tmpbuf[512];
- read(giCoke_SerialFD, tmpbuf, sizeof(tmpbuf));
- #if TRACE_COKE
- printf("Coke_CanDispense: sending 'd7'\n");
- #endif
- Writef("d7\r\n");
- ret ++;
+ int delay = ciCoke_MinPeriod - (time(NULL) - gtCoke_LastDispenseTime);
+ Debug_Debug("Waiting for %i seconds (rate limit)", delay);
+ sleep( delay );
+ Debug_Debug("wait done");
}
- // Check for a timeout error
- if( !(ret < 3) ) {
- fprintf(stderr, "Coke machine timed out\n");
- return -2; // -EMYBAD
+ gtCoke_LastDispenseTime = time(NULL);
+
+ return Coke_int_DropSlot(slot);
+}
+
+// --- INTERNAL FUNCTIONS ---
+int Coke_int_ConnectToPLC(void)
+{
+ // Ratelimit
+ if( time(NULL) - gtCoke_LastReconnectTime < COKE_RECONNECT_RATELIMIT )
+ return -1;
+
+ if( !gCoke_Modbus )
+ {
+ gCoke_Modbus = modbus_new_tcp(gsCoke_ModbusAddress, 502);
+ if( !gCoke_Modbus )
+ {
+ perror("coke - modbus_new_tcp");
+ gtCoke_LastReconnectTime = time(NULL);
+ return 1;
+ }
}
+ else {
+ // Preven resource leaks
+ modbus_close(gCoke_Modbus);
+ }
+ Debug_Notice("Connecting to coke PLC machine on '%s'\n", gsCoke_ModbusAddress);
- // You need to do a 'd7' before reading the status
- // - Otherwise it sometimes reports a full slot as empty
- // [TPG] (2011-02-19)
- if( ret == 0 )
+ if( modbus_connect(gCoke_Modbus) )
{
- Writef("d7\r\n");
- WaitForColon();
+ gtCoke_LastReconnectTime = time(NULL);
+ perror("coke - modbus_connect");
+ modbus_free(gCoke_Modbus);
+ gCoke_Modbus = NULL;
+ return 1;
}
- // TODO: Handle "not ok" response to D7
-
- #if TRACE_COKE
- printf("Coke_CanDispense: sending 's%i'\n", Item);
- #endif
+ return 0;
+}
+
+int Coke_int_GetSlotFromItem(int Item, int bDispensing)
+{
+ if( Item < 0 || Item > 6 ) return -1;
+
+ // Non-coke slots
+ if( Item < 6 )
+ return Item;
- // Ask the coke machine
- Writef("s%i\r\n", Item);
-
- #if TRACE_COKE
- printf("Coke_CanDispense: reading response\n");
- #endif
- // Read from the machine (ignoring empty lines)
- while( (ret = ReadLine(sizeof(tmp)-1, tmp)) == 0 );
- #if TRACE_COKE
- printf("ret = %i, tmp = '%s'\n", ret, tmp);
- #endif
- // Read back-echoed lines
- while( tmp[0] == ':' || tmp[1] != 'l' )
+ // Iterate though coke slots and find the first one with a drink avaliable
+ // `giCoke_NextCokeSlot` ensures that the slots rotate
+ for( int i = 0; i < 4; i ++ )
{
- ret = ReadLine(sizeof(tmp)-1, tmp);
- printf("ret = %i, tmp = '%s'\n", ret, tmp);
- }
-
- // Catch an error
- if( ret <= 0 ) {
- fprintf(stderr, "Coke machine is not being chatty (read = %i)\n", ret);
- if( ret == -1 ) {
- perror("Coke Machine");
+ int slot = 6 + (i + giCoke_NextCokeSlot) % 4;
+ if( !Coke_int_IsSlotEmpty(slot) )
+ {
+ if(bDispensing) {
+ giCoke_NextCokeSlot ++;
+ if(giCoke_NextCokeSlot == 4) giCoke_NextCokeSlot = 0;
+ }
+ return slot; // Drink avaliable
}
- return -1;
}
-
- #if TRACE_COKE
- printf("Coke_CanDispense: wait for the prompt again\n");
- #endif
- // Eat rest of response
- WaitForColon();
+ // Coke is empty!
+ // - Return 6, even if it's empty, the checks elsewhere will avoid problems
+ return 6;
+}
- // Parse status response
- ret = RunRegex(&gCoke_StatusRegex, tmp, sizeof(matches)/sizeof(matches[0]), matches, "Bad Response");
- if( ret ) {
- return -1;
- }
+int Coke_int_IsSlotEmpty(int Slot)
+{
+ uint8_t status;
- // Get slot status
- tmp[ matches[3].rm_eo ] = '\0';
- status = &tmp[ matches[3].rm_so ];
-
- #if TRACE_COKE
- printf("Coke_CanDispense: Machine responded slot status '%s'\n", status);
- #endif
+ if( Slot < 0 || Slot > 9 ) return -1;
- if( strcmp(status, "full") == 0 )
- return 0;
+ errno = 0;
+ if( _ReadBit(ciCoke_StatusBitBase + Slot, &status) )
+ {
+ perror("Coke_int_IsSlotEmpty - modbus_read_bits");
+ return -2;
+ }
- return 1;
+ return status == 0;
}
-/**
- * \brief Actually do a dispense from the coke machine
- */
-int Coke_DoDispense(int UNUSED(User), int Item)
+int Coke_int_DropSlot(int Slot)
{
- char tmp[32];
- int ret;
+ uint8_t res;
- // Sanity please
- if( Item < 0 || Item > 6 ) return -1;
+ if(Slot < 0 || Slot > 9) return -1;
- // Can't dispense if the machine is not connected
- if( giCoke_SerialFD == -1 )
+ // Check if a dispense is in progress
+ if( _ReadBit(ciCoke_DropBitBase + Slot, &res) )
+ {
+ perror("Coke_int_DropSlot - modbus_read_bits#1");
return -2;
-
- #if TRACE_COKE
- printf("Coke_DoDispense: flushing input\n");
- #endif
-
- // Wait for prompt
- ret = 0;
- while( WaitForColon() && ret < 3 )
+ }
+ if( res != 0 )
{
- // Flush the input buffer
- char tmpbuf[512];
- read(giCoke_SerialFD, tmpbuf, sizeof(tmpbuf));
- #if TRACE_COKE
- printf("Coke_DoDispense: sending 'd7'\n");
- #endif
- Writef("d7\r\n");
+ // Manual dispense in progress
+ return -1;
}
- #if TRACE_COKE
- printf("Coke_DoDispense: sending 'd%i'\n", Item);
- #endif
// Dispense
- Writef("d%i\r\n", Item);
-
- // Read empty lines and echo-backs
- do {
- ret = ReadLine(sizeof(tmp)-1, tmp);
- if( ret == -1 ) return -1;
- #if TRACE_COKE
- printf("Coke_DoDispense: read %i '%s'\n", ret, tmp);
- #endif
- } while( ret == 0 || tmp[0] == ':' || tmp[0] == 'd' );
-
- WaitForColon(); // Eat up rest of response
-
- #if TRACE_COKE
- printf("Coke_DoDispense: done\n");
- #endif
-
- // TODO: Regex
- if( strcmp(tmp, "ok") == 0 ) {
- // We think dispense worked
- // - The machine returns 'ok' if an empty slot is dispensed, even if
- // it doesn't actually try to dispense (no sound)
- return 0;
+ if( _WriteBit(ciCoke_DropBitBase + Slot, 1) )
+ {
+ perror("Coke_int_DropSlot - modbus_write_bit");
+ return -2;
}
- printf("Machine returned unknown value '%s'\n", tmp);
-
- return -1;
-}
-
-char ReadChar()
-{
- fd_set readfs;
- char ch = 0;
- int ret;
- struct timeval timeout;
-
- timeout.tv_sec = READ_TIMEOUT;
- timeout.tv_usec = 0;
-
- FD_ZERO(&readfs);
- FD_SET(giCoke_SerialFD, &readfs);
-
- ret = select(giCoke_SerialFD+1, &readfs, NULL, NULL, &timeout);
- if( ret == 0 ) return 0; // Timeout
- if( ret != 1 ) {
- printf("readchar return %i\n", ret);
- return 0;
- }
-
- ret = read(giCoke_SerialFD, &ch, 1);
- if( ret != 1 ) {
- printf("ret = %i\n", ret);
- return 0;
+ // Check that it started
+ usleep(1000); // 1ms
+ if( _ReadBit(ciCoke_DropBitBase + Slot, &res) )
+ {
+ perror("Coke_int_DropSlot - modbus_read_bits#2");
+ return -2;
}
-
- return ch;
-}
-
-int Writef(const char *Format, ...)
-{
- va_list args;
- int len;
-
- va_start(args, Format);
- len = vsnprintf(NULL, 0, Format, args);
- va_end(args);
-
+ if( res == 0 )
{
- char buf[len+1];
- va_start(args, Format);
- vsnprintf(buf, len+1, Format, args);
- va_end(args);
-
- #if DEBUG
- printf("Writef: %s", buf);
- #endif
-
- return write(giCoke_SerialFD, buf, len);
+ // Oops!, no drink
+ Log_Error("Drink dispense failed, bit lowered too quickly");
+ Debug_Notice("Drink dispense failed, bit lowered too quickly");
+ return 1;
}
+ return 0;
}
-int WaitForColon()
+int _ReadBit(int BitNum, uint8_t *Value)
{
- fd_set readfs;
- char ch = 0;
-
- FD_SET(giCoke_SerialFD, &readfs);
-
- while( (ch = ReadChar()) != ':' && ch != 0);
-
- if( ch == 0 ) return -1; // Timeout
-
- return 0;
+ errno = 0;
+ if( !gCoke_Modbus && Coke_int_ConnectToPLC() )
+ return -1;
+ if( modbus_read_bits( gCoke_Modbus, BitNum, 1, Value) >= 0 )
+ return 0;
+ if( Coke_int_ConnectToPLC() )
+ return -1;
+ if( modbus_read_bits( gCoke_Modbus, BitNum, 1, Value) >= 0 )
+ return 0;
+ return -1;
}
-int ReadLine(int len, char *output)
+int _WriteBit(int BitNum, uint8_t Value)
{
- char ch;
- int i = 0;
-
- for(;;)
- {
- ch = ReadChar();
-
- if( i < len )
- output[i++] = ch;
-
- if( ch == '\0' ) {
- break;
- }
- if( ch == '\n' || ch == '\r' ) {
- if( i < len )
- output[--i] = '\0';
- break;
- }
- }
-
- //printf("ReadLine: output=%s\n", output);
-
- if( !ch ) return -1;
- return i;
+ errno = 0;
+ if( !gCoke_Modbus && Coke_int_ConnectToPLC() )
+ return -1;
+ if( modbus_write_bit( gCoke_Modbus, BitNum, Value != 0 ) >= 0 )
+ return 0;
+ // Error case
+ if( Coke_int_ConnectToPLC() )
+ return -1;
+ if( modbus_write_bit( gCoke_Modbus, BitNum, Value != 0 ) >= 0 )
+ return 0;
+ return -1;
}
-
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