modbus_connect - establish a Modbus connection

       The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>

libmodbus v3.1.6                                   12/09/2019                                  MODBUS_CONNECT(3)

       The modbus_connect() function shall establish a connection to a Modbus server, a network or a bus using
       the context information of libmodbus context given in argument.

           modbus_t *ctx;

           ctx = modbus_new_tcp("127.0.0.1", 502);
           if (modbus_connect(ctx) == -1) {
               fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno));
               modbus_free(ctx);
               return -1;
           }

       modbus_connect - establish a Modbus connection

       The function shall return 0 if successful. Otherwise it shall return -1 and set errno to one of the
       values defined by the system calls of the underlying platform.

modbus_close(3)

intmodbus_connect(modbus_t*ctx);