NAME¶

modbus_reply - send a reponse to the received request

SYNOPSIS¶

*int modbus_reply(modbus_t * ctx, const uint8_t *req, int req_length, modbus_mapping_t * mb_mapping);

DESCRIPTION¶

The modbus_reply() function shall send a response to received request. The request req given in argument is analyzed, a response is then built and sent by using the information of the modbus context ctx. If the request indicates to read or write a value the operation will done in the modbus mapping mb_mapping according to the type of the manipulated data. If an error occurs, an exception response will be sent. This function is designed for Modbus server.

RETURN VALUE¶

The modbus_reply() function shall return the length of the response sent if successful. Otherwise it shall return -1 and set errno.

ERRORS¶

EMBMDATA See also the errors returned by the syscall used to send the response (eg. send or write).

SEE ALSO¶

modbus_reply_exception(3) libmodbus(7)

AUTHORS¶

The libmodbus documentation was written by Stéphane Raimbault < stephane.raimbault@gmail.com[1]>

NOTES¶

1.

stephane.raimbault@gmail.com