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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 ALSO

       modbus_reply_exception(3) libmodbus(7)


AUTHORS

       The libmodbus documentation was written by Stephane 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)

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