Displaystring and DateAndTime

Hello there,
 
 I've concentrated on getting to know SNMP and Net-SNMP this month, and now I'd like to ask for your help.
 
 My story:
 I've got the purpose, to be able to get and set hostname and date from a new, own MIB on my localhost. It doesn't sound so difficult, but I can't manage it unfortunately.
 
 Until now I could only get and set an integer type from my MIB.
 -this is my MIB: UHMIB.txt
 There are three nodes/objects in it: hostname, date and a number.
 1. Have I defined them well?
 2. What is DEFVAL for?
 3. Should I use it for hostname and date, too?
 4. Do I have to write .c and .h files for every single one object? (One for the hostname and one for date and so on...?) Isn't there any other methods? I guess there is, only I don't know it yet..
 
 I've written a .c and .h for the number object, it's like the .c and .h files in the tutorial, and it works.
 
 I tried the same with the hostname: here it is: mfmHostname.c, .h.
 I've put these to agent/mibgroup, and gave the commands
 './configure --with-mib-modules="mfmHostname" ', (v2c)
 make,
 make install,
 /usr/local/sbin/snmpd,
 export MIBS=+UHMIB .
 
 snmptranslate .1.3.6.1.4.1.30000.1.2
 -> UHMIB::mfmHostname
 
 snmpget -v2c -c public localhost UHMIB::mfmHostname.0
 -> No such object available on this agent at this OID.
 
 snmpset -v2c -c private localhost UHMIB::mfmHostname.0 = "bla"
 -> Error in packet.
 -> Reason: notWritable (supports no modification)
 
 So, here I stand now.
 5. ? :) What did I wrong? 
 6. Where could I find the .c files for the objects already existing and functioning? For example, I stole my mfmHostname from SNMPv2-MIB::sysName.0. I defined it the same way, I had to get it the same way, too... Any suggestions?
 
 7. How would the .c file for the date look? (Isn't there anybody wanting to do my job for me?: ) ...was a joke)
 
 Forgive me that I'm so badly a beginner. But at least I'm very snoopy, too, and eager to do it right.
 Thanks a lot and best wishes,
 
 Nikolett

______________________________________________________________
Névreszóló takarók - kíváló ajándék születésre, szülinapra, névnapra.
http://www.takoo.hu

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UHMIB DEFINITIONS ::= BEGIN

IMPORTS 
	OBJECT-TYPE, Integer32,
	MODULE-IDENTITY 		FROM SNMPv2-SMI
	DisplayString, DateAndTime 	FROM SNMPv2-TC;

uhmib MODULE-IDENTITY
	LAST-UPDATED "200707180000Z"
	ORGANIZATION "SSI Schaefer PEEM"
	CONTACT-INFO
		"	SSI Schaefer PEEM

		Postal: 

		   Tel: 

		E-mail: "
	DESCRIPTION
		"The Structure of Management Information for the
		First MIB."
	REVISION      "200707200000Z"
	DESCRIPTION
		"Initial version of this MIB module."
	
	::= { enterprises 30000}	


internet	OBJECT IDENTIFIER ::= {iso(1) org(3) dod(6) 1}
enterprises	OBJECT IDENTIFIER ::= {internet(1) private(4) 1}


sysInfo OBJECT IDENTIFIER ::= {uhmib 1}

mfmUhrzeit OBJECT-TYPE
	SYNTAX DateAndTime
	MAX-ACCESS read-write
	STATUS current
	DESCRIPTION
		"hrSystemDate.0"
	::={sysInfo 1}

mfmHostname OBJECT-TYPE
	SYNTAX DisplayString (SIZE (0..255))
	MAX-ACCESS read-write
	STATUS current
	DESCRIPTION
		"sysName.0"
	::={sysInfo 2}

mfmNumber OBJECT-TYPE
	SYNTAX Integer32
	MAX-ACCESS read-write
	STATUS current
	DESCRIPTION "just an integer"
	DEFVAL { 6 }
	::= { sysInfo 3}
	


	
END

#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include "mfmHostname.h"



//static int      nstAgentModuleObject = 1;
static string mfmHostname = "mfmHostname";


void
//init_nstAgentModuleObject(void)
init_mfmHostname(void)
{
    static oid      mfmHostname_oid[] =
        { 1, 3, 6, 1, 4, 1, 30000, 1, 2, 0 };

    
    DEBUGMSGTL(("mfmHostname",
                "Initializing the mfmHostname module\n"));


   
    DEBUGMSGTL(("mfmHostname",
                "Initalizing mfmHostname displaystring.  Default value = %s\n",
                mfmHostname));

    netsnmp_register_int_instance("mfmHostname",
                                  mfmHostname_oid,
                                  OID_LENGTH(mfmHostname_oid),
                                  &mfmHostname, NULL);

    DEBUGMSGTL(("mfmHostname",
                "Done initalizing mfmHostname module\n"));
}

#ifndef MFMHOSTNAME_H
#define MFMHOSTNAME_H

void 
init_mfmHostname(void);

#endif