modbus_server.h

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#ifndef _MODBUS_SERVER_H
#define _MODBUS_SERVER_H
 
//Dependencies
#include "core/net.h"
#include "modbus/modbus_common.h"
 
//Modbus/TCP server support
#ifndef MODBUS_SERVER_SUPPORT
   #define MODBUS_SERVER_SUPPORT ENABLED
#elif (MODBUS_SERVER_SUPPORT != ENABLED && MODBUS_SERVER_SUPPORT != DISABLED)
   #error MODBUS_SERVER_SUPPORT parameter is not valid
#endif
 
//Modbus/TCP security
#ifndef MODBUS_SERVER_TLS_SUPPORT
   #define MODBUS_SERVER_TLS_SUPPORT DISABLED
#elif (MODBUS_SERVER_TLS_SUPPORT != ENABLED && MODBUS_SERVER_TLS_SUPPORT != DISABLED)
   #error MODBUS_SERVER_TLS_SUPPORT parameter is not valid
#endif
 
//Stack size required to run the Modbus/TCP server
#ifndef MODBUS_SERVER_STACK_SIZE
   #define MODBUS_SERVER_STACK_SIZE 650
#elif (MODBUS_SERVER_STACK_SIZE < 1)
   #error MODBUS_SERVER_STACK_SIZE parameter is not valid
#endif
 
//Priority at which the Modbus/TCP server should run
#ifndef MODBUS_SERVER_PRIORITY
   #define MODBUS_SERVER_PRIORITY OS_TASK_PRIORITY_NORMAL
#endif
 
//Maximum number of simultaneous connections
#ifndef MODBUS_SERVER_MAX_CONNECTIONS
   #define MODBUS_SERVER_MAX_CONNECTIONS 2
#elif (MODBUS_SERVER_MAX_CONNECTIONS < 1)
   #error MODBUS_SERVER_MAX_CONNECTIONS parameter is not valid
#endif
 
//Idle connection timeout
#ifndef MODBUS_SERVER_TIMEOUT
   #define MODBUS_SERVER_TIMEOUT 60000
#elif (MODBUS_SERVER_TIMEOUT < 1000)
   #error MODBUS_SERVER_TIMEOUT parameter is not valid
#endif
 
//Modbus/TCP server tick interval
#ifndef MODBUS_SERVER_TICK_INTERVAL
   #define MODBUS_SERVER_TICK_INTERVAL 1000
#elif (MODBUS_SERVER_TICK_INTERVAL < 100)
   #error MODBUS_SERVER_TICK_INTERVAL parameter is not valid
#endif
 
//TX buffer size for TLS connections
#ifndef MODBUS_SERVER_TLS_TX_BUFFER_SIZE
   #define MODBUS_SERVER_TLS_TX_BUFFER_SIZE 2048
#elif (MODBUS_SERVER_TLS_TX_BUFFER_SIZE < 512)
   #error MODBUS_SERVER_TLS_TX_BUFFER_SIZE parameter is not valid
#endif
 
//RX buffer size for TLS connections
#ifndef MODBUS_SERVER_TLS_RX_BUFFER_SIZE
   #define MODBUS_SERVER_TLS_RX_BUFFER_SIZE 2048
#elif (MODBUS_SERVER_TLS_RX_BUFFER_SIZE < 512)
   #error MODBUS_SERVER_TLS_RX_BUFFER_SIZE parameter is not valid
#endif
 
//Maximum length of the client role OID
#ifndef MODBUS_SERVER_MAX_ROLE_LEN
   #define MODBUS_SERVER_MAX_ROLE_LEN 32
#elif (MODBUS_SERVER_MAX_ROLE_LEN < 0)
   #error MODBUS_SERVER_MAX_ROLE_LEN parameter is not valid
#endif
 
//Application specific context
#ifndef MODBUS_SERVER_PRIVATE_CONTEXT
   #define MODBUS_SERVER_PRIVATE_CONTEXT
#endif
 
//TLS supported?
#if (MODBUS_SERVER_TLS_SUPPORT == ENABLED)
   #include "core/crypto.h"
   #include "tls.h"
   #include "tls_ticket.h"
#endif
 
//Forward declaration of ModbusServerContext structure
struct _ModbusServerContext;
#define ModbusServerContext struct _ModbusServerContext
 
//Forward declaration of ModbusClientConnection structure
struct _ModbusClientConnection;
#define ModbusClientConnection struct _ModbusClientConnection
 
//C++ guard
#ifdef __cplusplus
extern "C" {
#endif
 
 
typedef enum
{
   MODBUS_CONNECTION_STATE_CLOSED       = 0,
   MODBUS_CONNECTION_STATE_CONNECT_TLS  = 1,
   MODBUS_CONNECTION_STATE_RECEIVE      = 2,
   MODBUS_CONNECTION_STATE_SEND         = 3,
   MODBUS_CONNECTION_STATE_SHUTDOWN_TLS = 4,
   MODBUS_CONNECTION_STATE_SHUTDOWN_TX  = 5,
   MODBUS_CONNECTION_STATE_SHUTDOWN_RX  = 6
} ModbusConnectionState;
 
 
typedef error_t (*ModbusServerOpenCallback)(ModbusClientConnection *connection,
   IpAddr clientIpAddr, uint16_t clientPort);
 
 
typedef void (*ModbusServerCloseCallback)(ModbusClientConnection *connection);
 
 
//TLS supported?
#if (MODBUS_SERVER_TLS_SUPPORT == ENABLED)
 
typedef error_t (*ModbusServerTlsInitCallback)
   (ModbusClientConnection *connection, TlsContext *tlsContext);
 
#endif
 
 
typedef void (*ModbusServerLockCallback)(void);
 
 
typedef void (*ModbusServerUnlockCallback)(void);
 
 
typedef error_t (*ModbusServerReadCoilCallback)(const char_t *role,
   uint16_t address, bool_t *state);
 
 
typedef error_t (*ModbusServerWriteCoilCallback)(const char_t *role,
   uint16_t address, bool_t state, bool_t commit);
 
 
typedef error_t (*ModbusServerReadRegCallback)(const char_t *role,
   uint16_t address, uint16_t *value);
 
 
typedef error_t (*ModbusServerWriteRegCallback)(const char_t *role,
   uint16_t address, uint16_t value, bool_t commit);
 
 
typedef error_t (*ModbusServerProcessPduCallback)(const uint8_t *request,
   size_t requestLen, uint8_t *response, size_t *responseLen);
 
 
typedef void (*ModbusServerTickCallback)(ModbusServerContext *context);
 
 
typedef struct
{
   NetInterface *interface;                                
   uint16_t port;                                          
   uint8_t unitId;                                         
   systime_t timeout;                                      
   ModbusServerOpenCallback openCallback;                  
   ModbusServerCloseCallback closeCallback;                
#if (MODBUS_SERVER_TLS_SUPPORT == ENABLED)
   ModbusServerTlsInitCallback tlsInitCallback;            
#endif
   ModbusServerLockCallback lockCallback;                  
   ModbusServerUnlockCallback unlockCallback;              
   ModbusServerReadCoilCallback readCoilCallback;          
   ModbusServerReadCoilCallback readDiscreteInputCallback; 
   ModbusServerWriteCoilCallback writeCoilCallback;        
   ModbusServerReadRegCallback readRegCallback;            
   ModbusServerReadRegCallback readHoldingRegCallback;     
   ModbusServerReadRegCallback readInputRegCallback;       
   ModbusServerWriteRegCallback writeRegCallback;          
   ModbusServerProcessPduCallback processPduCallback;      
   ModbusServerTickCallback tickCallback;                  
} ModbusServerSettings;
 
 
struct _ModbusClientConnection
{
   ModbusConnectionState state;                 
   ModbusServerContext *context;                
   Socket *socket;                              
#if (MODBUS_SERVER_TLS_SUPPORT == ENABLED)
   TlsContext *tlsContext;                      
#endif
   char_t role[MODBUS_SERVER_MAX_ROLE_LEN + 1]; 
   systime_t timestamp;                         
   uint8_t requestAdu[MODBUS_MAX_ADU_SIZE];     
   size_t requestAduLen;                        
   size_t requestAduPos;                        
   uint8_t requestUnitId;                       
   uint8_t responseAdu[MODBUS_MAX_ADU_SIZE];    
   size_t responseAduLen;                       
   size_t responseAduPos;                       
};
 
 
struct _ModbusServerContext
{
   ModbusServerSettings settings;                                    
   bool_t running;                                                   
   bool_t stop;                                                      
   OsEvent event;                                                    
   OsTaskId taskId;                                                  
#if (OS_STATIC_TASK_SUPPORT == ENABLED)
   OsTaskTcb taskTcb;                                                
   OsStackType taskStack[MODBUS_SERVER_STACK_SIZE];                  
#endif
   Socket *socket;                                                   
   ModbusClientConnection connection[MODBUS_SERVER_MAX_CONNECTIONS]; 
#if (MODBUS_SERVER_TLS_SUPPORT == ENABLED && TLS_TICKET_SUPPORT == ENABLED)
   TlsTicketContext tlsTicketContext;                                
#endif
   MODBUS_SERVER_PRIVATE_CONTEXT                                     
};
 
 
//Modbus/TCP server related functions
void modbusServerGetDefaultSettings(ModbusServerSettings *settings);
 
error_t modbusServerInit(ModbusServerContext *context,
   const ModbusServerSettings *settings);
 
error_t modbusServerStart(ModbusServerContext *context);
error_t modbusServerStop(ModbusServerContext *context);
 
void modbusServerTask(ModbusServerContext *context);
 
void modbusServerDeinit(ModbusServerContext *context);
 
//C++ guard
#ifdef __cplusplus
}
#endif
 
#endif