Repeated SET requests failing

Oops, I mistakenly posted this on the coders list the other day, trying the proper list now.


I'm working on a Mac OSX program that controls a video processing card. After opening a session reading from the card works flawlessly, and the very first set command I send always works, but subsequent set commands will work or fail depending on which ones I send.
One command that sets aspect ratio (an integer 1 through 7) works perfectly, yet another that turns on or off a text overlay will only work once.

I've enabled the snmp debug messages with a ~/.snmp.conf entry and can see that the working packets are 50 bytes long while that ones that fail are only 30 bytes.

I've tried using net-snmp 5.4 and get the same behavior as Tiger's default  5.2.1

I'm currently opening a session and just chattering away, do I maybe need to close and reopen with each set request?

Objective-C code:

-(id) initWithHost:(NSString*) host
				 community:(NSString*) community
{
	if (nil == host || nil == community) return nil;
	self = [super init];
	if (nil == self) return nil;
	
	init_snmp("SNMP-Test-Cocoa");
	struct snmp_session s;
	snmp_sess_init(&s);
	s.version = SNMP_VERSION_2c;
	s.community = (u_char*)strdup([community UTF8String]);
	s.community_len = strlen((char*)s.community);
	s.peername = strdup([host UTF8String]);
	session = snmp_open(&s);
	if (NULL == session) {
		[self release];
		return nil;
	}
	return self;
}


-(void) setOidIntValue:(NSString *)objectIdString value:(int)intVal
{
	if (NULL == session) exit;
	size_t length = MAX_OID_LEN;
	oid objectid[MAX_OID_LEN];
	read_objid([objectIdString UTF8String], objectid, &length);
	
	struct snmp_pdu *pdu = snmp_pdu_create(SNMP_MSG_SET);
	char value = intVal + 0x30;
	snmp_add_var(pdu, objectid, length, 'i', &intVal);
	struct snmp_pdu *response = NULL;

	int status = snmp_synch_response(session, pdu, &response);
    if (status == STAT_SUCCESS)
		if (response->errstat != SNMP_ERR_NOERROR)
			NSLog(@"Error in SNMP Packet");
	if (response)
	{
		snmp_free_pdu(response);
	}
}


Ward Witt
The Filmworkers Club

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