MODBUS_REPLY(3) Libmodbus Manual MODBUS_REPLY(3)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
Sending has failed
See also the errors returned by the syscall used to send the response
(eg. send or write).
SEE ALSOmodbus_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
mailto:stephane.raimbault@gmail.com
libmodbus 3.1.0 10/06/2013 MODBUS_REPLY(3)
