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Man Pages
MODBUS_STRERROR(3) libmodbus Manual MODBUS_STRERROR(3)

modbus_strerror - return the error message

const char *modbus_strerror(int errnum);

The modbus_strerror() function shall return a pointer to an error message string corresponding to the error number specified by the errnum argument. As libmodbus defines additional error numbers over and above those defined by the operating system, applications should use modbus_strerror() in preference to the standard strerror() function.

The modbus_strerror() function shall return a pointer to an error message string.

No errors are defined.

Display an error message when a Modbus connection cannot be established.

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

linkmb:libmodbus

The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>
04/09/2022 libmodbus v3.1.6

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