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- 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 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 ALSO
- --------
- linkmb:modbus_reply_exception[3]
- linkmb:libmodbus[7]
- AUTHORS
- -------
- The libmodbus documentation was written by Stéphane Raimbault
- <stephane.raimbault@gmail.com>
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