How to create a table for an agentx Client in C

Hello,

I am working on creating a system for monitoring temperature and
humidity in server rooms based on the raspberry pi.
I am using NET-SNMP to send the data over the network to various
monitoring tools.

My Question is how do I create rows and columns using pointers to a
variable?

I have this so far:

void
initialize_table_semsSensorTable(void)
{
    const oid semsSensorTable_oid[] = {1,3,6,1,4,1,40790,1,1,1,1};
    netsnmp_table_data_set *table_set;
    netsnmp_table_row *row;

    /* create the table structure itself */
    table_set = netsnmp_create_table_data_set("semsSensorTable");

    /* comment this out or delete if you don't support creation of new
rows */
    table_set->allow_creation = 1;

    /***************************************************
     * Adding indexes     */
    DEBUGMSGTL(("initialize_table_semsSensorTable",
                "adding indexes to table semsSensorTable\n"));
    netsnmp_table_set_add_indexes(table_set,
                           ASN_UNSIGNED,  /* index: semsSensorPortNbr */
                          0);
    DEBUGMSGTL(("initialize_table_semsSensorTable",
                "adding column types to table semsSensorTable\n"));         
    netsnmp_table_set_multi_add_default_row(table_set,
                                            COLUMN_SEMSSENSORPORTNBR,
ASN_UNSIGNED, 0,
                                            NULL, 0,
                                            COLUMN_SEMSSENSORSTAUTS,
ASN_INTEGER, 0,
                                            NULL, 0,
                                            COLUMN_SEMSSENSORTYPE,
ASN_INTEGER, 0,
                                            NULL, 0,
                                            COLUMN_SEMSSENSORDATA,
ASN_OCTET_STR, 0,
                                            NULL, 0,
                                            COLUMN_SEMSSENSORLOC,
ASN_OCTET_STR, 1,
                                            NULL, 0,
                              0);
   
    /* registering the table with the master agent */
    /* note: if you don't need a subhandler to deal with any aspects
       of the request, change semsSensorTable_handler to "NULL" */
   
netsnmp_register_table_data_set(netsnmp_create_handler_registration("semsSensorTable",
semsSensorTable_handler,
                                                        semsSensorTable_oid,
                                                       
OID_LENGTH(semsSensorTable_oid),
                                                        HANDLER_CAN_RWRITE),
                            table_set, NULL);
  
   for (indx = 0; indx < 8; indx++){
    sensorTable t = {0,0,0,NULL,NULL};
    t.port = indx+1;
        sensors[indx] = &t;
       row = netsnmp_create_table_data_row();
       netsnmp_table_row_add_index(row,ASN_UNSIGNED,&indx,sizeof(indx));
       netsnmp_set_row_column(row, 1,
ASN_INTEGER,&sensors[indx]->status,sizeof(sensors[indx]->status));
       netsnmp_mark_row_column_writable(row, 1, 0);        // make
writable via SETs
       netsnmp_table_dataset_add_row(table_set, row);
   }
   netsnmp_register_auto_data_table(table_set, NULL); 
}

>From what i Observed it reported that I had to many columns when I did:
snmptable -v 2c -m + -c sems.inforelay localhost SST-SEMS::semsSensorTable

The MIBS can be downloaded @
https://github.com/atmega168/SEMS/tree/master/mibs

I really appreciate any help I can get on this.

Regards,
David Goldberg




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