Using the net-snmp library to set/get custom MIB value on printer

Hi,
 
Using NET-SNMP package version 5.4.2.1 on Windows XP x64 + all updates and service packs.  AMD Athalon 64 bit CPU.  2 GB RAM.  Sorry if this arrives as HTML mail, using OWA...
 
Background:
 
When using the above package to get/set a private MIB on a multi-function printer the results are exactly what I'd expect.  Reading returns 3, setting the integer value to 4 reboots the printer.  I have scripted this functionality to reboot several dozen printers nightly.  This solution works but because the MIB is private I can't distribute the script as the MIB is shown in plain text.
 
As a starting point to making a more secure distribution I created a Win32 console app based on the tutorial sample found at http://www.net-snmp.org/wiki/index.php/TUT:Simple_Application and linking with the libraries found in the 5.4.2.1 distribution.
 
The app works correctly to read the MIB (identical response as snmpget command line util) but fails when writing to the MIB with the value 4.
 
At first I was getting a -61 return value because I was passing the fourth parameter incorrectly:
 
char x = '4';
int r = snmp_add_var(pdu, anOID, anOID_len, ASN_INTEGER, &x);
 
I then looked at the source code for snmpset and changed the code:
 
char x = '4';
char i = 'i';
// int r = snmp_add_var(pdu, anOID, anOID_len, ASN_INTEGER, &x);
int r = snmp_add_var(pdu, anOID, anOID_len, i, &x);

Now I get -56 as the return.
 
My C is a bit rusty; am I forgetting something fundamental here?
 
Is -56 (SNMPERR_BAD_NAME) an error returned from the printer or an error from the library?
 
What might I be doing wrong here?  Could the error value indicate that the OID is not recognized by the printer?
 
Thanks,
NB

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