When should to pass a need flush flag to response_exception() and when shouldn't?

[孙世龙]

Hi, list

Here are the related code snippets:

int modbus_reply(modbus_t *ctx, const uint8_t *req,

                 int req_length, modbus_mapping_t *mb_mapping)

{

case MODBUS_FC_READ_HOLDING_REGISTERS:

    {

    ...

        if (nb < 1 || MODBUS_MAX_READ_REGISTERS < nb) {

            rsp_length = response_exception(

                ctx, &sft, MODBUS_EXCEPTION_ILLEGAL_DATA_VALUE, rsp, TRUE,

                                                     ^^^^

                "Illegal nb of values %d in %s (max %d)\n",

                nb, name, MODBUS_MAX_READ_REGISTERS);

        } else if (mapping_address < 0 || (mapping_address + nb) > nb_registers) {

            rsp_length = response_exception(

                ctx, &sft, MODBUS_EXCEPTION_ILLEGAL_DATA_ADDRESS, rsp, FALSE,

                                                       ^^^^^

                "Illegal data address 0x%0X in %s\n",

                mapping_address < 0 ? address : address + nb, name);

        } 

else {

...

}

Why the former one passes TRUE whereas the latter one passes FALSE?

Best Regards

Sunshilong

[孙世龙 sunshilong]