How to send an SNMP broadcast?

For the SANE (scanner driver) backend of the KONICA MINOLTA magicolor 1690mf 
device, I'm implementing SNMP device discovery. It works by sending an SNMP 
request to 255.255.255.255 for the OIDs
1.3.6.1.2.1.1.1.0 (SNMPv2-MIB::sysDescr.0)
1.3.6.1.2.1.1.2.0 (SNMPv2-MIB::sysObjectID.0)
1.3.6.1.2.1.2.2.1.6.1 (IF-MIB::ifPhysAddress.1)

Unfortunately, it seems I'm unable to send the request with snmpget. I always 
get a permission denied, even as root:

root@einstein:~# snmpget -v 2c -c public 255.255.255.255 1.3.6.1.2.1.1.1.0 \
     1.3.6.1.2.1.1.2.0 1.3.6.1.2.1.2.2.1.6.1
snmpget: Failure in sendto (Permission denied)

Inserting the (usually unknown) IP, of course things work (but that entirely 
defeats the purpose of a device discovery):

reinhold@einstein:~$ snmpget -v 2c -c public  10.0.0.5  1.3.6.1.2.1.1.1.0 \
      1.3.6.1.2.1.1.2.0 1.3.6.1.2.1.2.2.1.6.1
SNMPv2-MIB::sysDescr.0 = STRING: KONICA MINOLTA magicolor 1690MF
SNMPv2-MIB::sysObjectID.0 = OID: SNMPv2-
SMI::enterprises.18334.1.1.1.1.1.23.1.1
IF-MIB::ifPhysAddress.1 = STRING: 0:20:6b:cc:6:77


Of course, I'll need to implement it in C, so the command line utils are not 
really relevant, but in the C API docs I couldn't find anything on sending an 
SMTP broadcast, either. Also, the mailing list archives didn't return any 
result on my search for broadcast.


So, how can I use net-snmp (both the command line utils and/or the C 
functions) to send a broadcast?

Thanks,
Reinhold

-- 
------------------------------------------------------------------
Reinhold Kainhofer, [email protected], http://reinhold.kainhofer.com/
 * Financial & Actuarial Math., Vienna Univ. of Technology, Austria
 * http://www.fam.tuwien.ac.at/, DVR: 0005886
 * LilyPond, Music typesetting, http://www.lilypond.org

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