mb.h

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#pragma once

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <stdbool.h>

#include <modbus.h>
#include "uthash.h"
#include "log.h"
#include "json.h"

/* ==================================================
 *  struct
================================================== */

typedef struct 
{
    char ip[50];        
    char port[50];      
} mbtcp_key_s;

typedef struct 
{
    mbtcp_key_s key;    
    bool connected;     
    modbus_t *ctx;      
    UT_hash_handle hh;  
} mbtcp_handle_s;


typedef char * (*mbtcp_fc)(uint8_t fc, mbtcp_handle_s *handle, cJSON *req);


/* ==================================================
 *  api
================================================== */

char * set_modbus_success_resp_str_with_data (char *tid, cJSON *json_arr);

char * set_modbus_success_resp_str (char *tid);

char * set_modbus_fail_resp_str (char *tid, const char *reason);

char * set_modbus_fail_resp_str_with_errno (char *tid, mbtcp_handle_s *handle, int errnum);

/* ==================================================
 *  modbus tcp (mbtcp)
================================================== */

bool mbtcp_init_handle (mbtcp_handle_s **ptr_handle, char *ip, char *port);

bool mbtcp_get_handle (mbtcp_handle_s **ptr_handle, char *ip, char *port);

void mbtcp_list_handles ();

bool mbtcp_do_connect (mbtcp_handle_s *handle, char **reason);

bool mbtcp_get_connection_status (mbtcp_handle_s *handle);

char * mbtcp_cmd_hanlder (uint8_t fc, cJSON *req, mbtcp_fc ptr_handler);


char * mbtcp_set_response_timeout (char *tid, long timeout);

char * mbtcp_get_response_timeout (char *tid);

char * mbtcp_read_bit_req_fn (uint8_t fc, mbtcp_handle_s *handle, cJSON *req);

char * mbtcp_read_reg_req_fn (uint8_t fc, mbtcp_handle_s *handle, cJSON *req);

char * mbtcp_single_write_req_fn (uint8_t fc, mbtcp_handle_s *handle, cJSON *req);

char * mbtcp_multi_write_req_fn (uint8_t fc, mbtcp_handle_s *handle, cJSON *req);