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/* File generated by Beremiz (PlugGenerate_C method of modbus Plugin instance) */

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/*

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 * Copyright (c) 2016 Mario de Sousa (msousa@fe.up.pt)

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 *

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 * This file is part of the Modbus library for Beremiz and matiec.

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 *

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 * This Modbus library is free software: you can redistribute it and/or modify

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 * it under the terms of the GNU Lesser General Public License as published by

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 * the Free Software Foundation, either version 2 of the License, or

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 * (at your option) any later version.

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 *

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 * This program is distributed in the hope that it will be useful, but

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 * WITHOUT ANY WARRANTY; without even the implied warranty of

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 

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 * General Public License for more details.

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 *

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 * You should have received a copy of the GNU Lesser General Public License

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 * along with this Modbus library.  If not, see <http://www.gnu.org/licenses/>.

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 *

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 * This code is made available on the understanding that it will not be

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 * used in safety-critical situations without a full and competent review.

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 */

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#include "mb_addr.h"

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#include "mb_tcp_private.h"

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#include "mb_master_private.h"

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#define DEF_REQ_SEND_RETRIES 0

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#define MODBUS_PARAM_STRING_SIZE 64

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  // Used by the Modbus server node

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#define MEM_AREA_SIZE 65536

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typedef struct{

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	    u16		ro_bits [MEM_AREA_SIZE];

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	    u16		rw_bits [MEM_AREA_SIZE];

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	    u16		ro_words[MEM_AREA_SIZE];

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	    u16		rw_words[MEM_AREA_SIZE];

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            /* Two flags to count the number of Modbus requests (read and write) we have 

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             * successfully received from any remote Modbus master.

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             * Two boolean flags that are set whenever we successfully process a

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             * Modbus request sent from a remote client.

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             * These flags will be mapped onto located variables

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             * so the user's IEC 61131-3 code can check whether we are being

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             * polled by a Modbus master.

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             * The counters will roll over to 0 upon reaching maximum value.

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             * The user will probably periodically reset the boolean flags to false,

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             * and use this as a communication timeout 

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             * (when it remains false in two consecutive periods)

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             * 

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             * u8  for BOOL  variable/flag

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             * u32 for UDINT variable/counter

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             */

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        u8   flag_write_req_flag;

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        u8   flag_read_req_flag;

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        u32  flag_write_req_counter;

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        u32  flag_read_req_counter;

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	} server_mem_t;

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/*

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 * Beremiz has a program to run on the PLC (Beremiz_service.py)

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 * to handle downloading of compiled programs, start/stop of PLC, etc.

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 * (see runtime/PLCObject.py for start/stop, loading, ...)

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 * 

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 * This service also includes a web server to access PLC state (start/stop)

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 * and to change some basic confiuration parameters.

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 * (see runtime/NevowServer.py for the web server)

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 * 

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 * The web server allows for extensions, where additional configuration

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 * parameters may be changed on the running/downloaded PLC.

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 * Modbus plugin also comes with an extension to the web server, through

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 * which the basic Modbus plugin configuration parameters may be changed

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 *

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 * This means that most values in the server_node_t and client_node_t

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 * may be changed after the co,piled code (.so file) is loaded into 

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 * memory, and before the code starts executing.

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 * Since the we will also want to change the host and port (TCP) and the

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 * serial device (RTU) at this time, it is best if we allocate memory for

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 * these strings that may be overwritten by the web server (i.e., do not use

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 * const strings) in the server_node_t and client_node_t structures.

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 *

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 * The following structure members

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 *    - node_addr_t.addr.tcp.host

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 *    - node_addr_t.addr.tcp.service  (i.e. the port)

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 *    - node_addr_t.addr.rtu.device

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 * are all char *, and do not allocate memory for the strings.

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 * 

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 * We therefore include two generic char arrays, str1 and str2,

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 * that will store the above strings, and the C code will initiliaze

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 * the node_addre_t.addr string pointers to these strings.

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 * i.e., either addr.rtu.device will point to str1,

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 *          or

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 *        addr.tcp.host and addr.tcp.service 

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 *        will point to str1 and str2 respectively

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 */

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typedef struct{

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	    const char *location;

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        const char *config_name;

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              char  str1[MODBUS_PARAM_STRING_SIZE];

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              char  str2[MODBUS_PARAM_STRING_SIZE]; 

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	    u8		slave_id;

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	    node_addr_t	node_address;

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	    int		mb_nd;      // modbus library node used for this server 

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	    int		init_state; // store how far along the server's initialization has progressed

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            /* entries from this point forward are not statically initialized when the variable is declared */

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            /* they will be initialized by the  code itself in the init() function */

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	    pthread_t	thread_id;  // thread handling this server

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	    server_mem_t	mem_area;

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	} server_node_t;

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  // Used by the Modbus client node

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typedef struct{

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	    const char *location;

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        const char *config_name;

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              char  str1[MODBUS_PARAM_STRING_SIZE];

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              char  str2[MODBUS_PARAM_STRING_SIZE]; 

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	    node_addr_t	node_address;

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	    int		mb_nd;      // modbus library node used for this client

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	    int		init_state; // store how far along the client's initialization has progressed

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	    u64		comm_period;// period to use when periodically sending requests to remote server (in ms)

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	    u64		req_delay;  // delay between 2 consecutive requests sent to remote slaves/server (in ms)

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	    int		prev_error; // error code of the last printed error message (0 when no error) 

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	    pthread_t   thread_id;  // thread handling all communication for this client node

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	    pthread_t	timer_thread_id;  // thread handling periodical timer for this client node

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	    pthread_mutex_t mutex;  // mutex to be used with the following condition variable

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        pthread_cond_t  condv;  // used to signal the client thread when to start new modbus transactions

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        int       execute_req;  /* used, in association with condition variable,  

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                                 *   to signal when to send the modbus request to the server

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                                 * Note that we cannot simply rely on the condition variable to signal

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                                 *   when to activate the client thread, as the call to 

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                                 *   pthread_cond_wait() may return without having been signaled!

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                                 *   From the manual:

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                                 *      Spurious  wakeups  from  the

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                                 *      pthread_cond_timedwait() or pthread_cond_wait()  functions  may  occur.

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                                 *      Since  the  return from pthread_cond_timedwait() or pthread_cond_wait()

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                                 *      does not imply anything about the value of this predicate,  the  predi-

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                                 *      cate should be re-evaluated upon such return.

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                                 */

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        int      periodic_act;  /* (boolen) flag will be set when the client node's thread was activated 

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                                 * (by signaling the above condition variable) by the periodic timer.

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                                 * Note that this same thread may also be activated (condition variable is signaled)

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                                 * by other sources, such as when the user program requests that a specific 

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                                 * client MB transation be executed (flag_exec_req in client_request_t)

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                                 */

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	} client_node_t;

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  // Used by the Modbus client plugin

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typedef enum {

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	    req_input,

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	    req_output,

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	    no_request		/* just for tests to quickly disable a request */

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	} iotype_t;

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#define REQ_BUF_SIZE 2000

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typedef struct{

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	    const char *location;

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	    int		client_node_id;

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	    u8		slave_id;

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	    iotype_t	req_type;

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	    u8		mb_function;

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	    u16		address;

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	    u16		count;

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	    int		retries;

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	    u8		mb_error_code; // modbus      error code (if any) of last executed request

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	    u8		tn_error_code; // transaction error code (if any) of last executed request

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	    int		prev_error; // error code of the last printed error message (0 when no error) 

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	    struct timespec resp_timeout;

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	    u8		write_on_change; // boolean flag. If true => execute MB request when data to send changes

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	      // buffer used to store located PLC variables

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	    u16		plcv_buffer[REQ_BUF_SIZE];

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	      // buffer used to store data coming from / going to server

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	    u16		coms_buffer[REQ_BUF_SIZE]; 

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	    pthread_mutex_t coms_buf_mutex; // mutex to access coms_buffer[]

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          /* boolean flag that will be mapped onto a (BOOL) located variable 

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           * (u8 because IEC 61131-3 BOOL are mapped onto u8 in C code! )

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           *    -> allow PLC program to request when to start the MB transaction

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           *    -> will be reset once the MB transaction has completed

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           */

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        u8     flag_exec_req;  

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          /* flag that works in conjunction with flag_exec_req

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           * (does not really need to be u8 as it is not mapped onto a located variable. )

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           *    -> used by internal logic to indicate that the client thread 

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           *       that will be executing the MB transaction

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           *       requested by flag exec_req has already been activated.

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           *    -> will be reset once the MB transaction has completed

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           */

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        u8     flag_exec_started;  

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          /* flag that will be mapped onto a (BYTE) located variable 

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           * (u8 because the flag is a BYTE! )

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           *    -> will store the result of the last executed MB transaction

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           *         1 -> error accessing IP network, or serial interface

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           *         2 -> reply received from server was an invalid frame

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           *         3 -> server did not reply before timeout expired

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           *         4 -> server returned a valid Modbus error frame

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           *    -> will be reset (set to 0) once this MB transaction has completed sucesfully

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           * 

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           * In other words, this variable is a copy of tn_error_code, reset after each request attempt completes.

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           * We map this copy (instead of tn_error_code) onto a located variable in case the user program decides

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           * to overwrite its value and mess up the plugin logic.

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           */

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        u8      flag_tn_error_code;  

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          /* flag that will be mapped onto a (BYTE) located variable 

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           * (u8 because the flag is a BYTE! )

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           *    -> if flag_tn_error_code is 4, this flag will store the MB error code returned by the MB server in a MB error frame

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           *    -> will be reset (set to 0) once this MB transaction has completed succesfully

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           * 

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           * In other words, this variable is a copy of mb_error_code, reset after each request attempt completes.

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           * We map this copy (instead of mb_error_code) onto a located variable in case the user program decides

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           * to overwrite its value and mess up the plugin logic.

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           */

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        u8      flag_mb_error_code;  

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	} client_request_t;

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/* The total number of nodes, needed to support _all_ instances of the modbus plugin */

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#define TOTAL_TCPNODE_COUNT       %(total_tcpnode_count)s

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#define TOTAL_RTUNODE_COUNT       %(total_rtunode_count)s

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#define TOTAL_ASCNODE_COUNT       %(total_ascnode_count)s

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/* Values for instance %(locstr)s of the modbus plugin */

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#define MAX_NUMBER_OF_TCPCLIENTS  %(max_remote_tcpclient)s

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#define NUMBER_OF_TCPSERVER_NODES %(tcpserver_node_count)s

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#define NUMBER_OF_TCPCLIENT_NODES %(tcpclient_node_count)s

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#define NUMBER_OF_TCPCLIENT_REQTS %(tcpclient_reqs_count)s

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#define NUMBER_OF_RTUSERVER_NODES %(rtuserver_node_count)s

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#define NUMBER_OF_RTUCLIENT_NODES %(rtuclient_node_count)s

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#define NUMBER_OF_RTUCLIENT_REQTS %(rtuclient_reqs_count)s

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#define NUMBER_OF_ASCIISERVER_NODES %(ascserver_node_count)s

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#define NUMBER_OF_ASCIICLIENT_NODES %(ascclient_node_count)s

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#define NUMBER_OF_ASCIICLIENT_REQTS %(ascclient_reqs_count)s

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#define NUMBER_OF_SERVER_NODES (NUMBER_OF_TCPSERVER_NODES + \

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                                NUMBER_OF_RTUSERVER_NODES + \

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                                NUMBER_OF_ASCIISERVER_NODES)

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#define NUMBER_OF_CLIENT_NODES (NUMBER_OF_TCPCLIENT_NODES + \

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                                NUMBER_OF_RTUCLIENT_NODES + \

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                                NUMBER_OF_ASCIICLIENT_NODES)

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#define NUMBER_OF_CLIENT_REQTS (NUMBER_OF_TCPCLIENT_REQTS + \

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                                NUMBER_OF_RTUCLIENT_REQTS + \

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                                NUMBER_OF_ASCIICLIENT_REQTS)

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/*initialization following all parameters given by user in application*/

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static client_node_t		client_nodes[NUMBER_OF_CLIENT_NODES] = {

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%(client_nodes_params)s

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};

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static client_request_t	client_requests[NUMBER_OF_CLIENT_REQTS] = {

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%(client_req_params)s

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};

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static server_node_t		server_nodes[NUMBER_OF_SERVER_NODES] = {

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%(server_nodes_params)s

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}

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;

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/*******************/

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/*located variables*/

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/*******************/

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%(loc_vars)s

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