Snmp newbie here, so bear WITH ME PLEASE...
I am confused and I hope someone can help.
I am writing an SNMP agent for a Cortex M4 application.
The SNMP books I have bought and what I have read on the net indicate that all
data fields should be ASN.1 encoded
However, looking at snmp commands sent by net-snmp, it appears that the Request
ID field is a simple (4 byte) 32 bit integer.
Here is a screen shot showing an snmpget transaction monitored through
Wireshark:
http://www.ko4bb.com/net-snmp/RequestID.png
It shows the RequestID to be 1750020546 (decimal) and 0x684F31C2 in hex. The
data field in Wireshark also shows it to be "68 4f 31 c2"
This is not ASN.1 encoded, otherwise the first 3 bytes would have their bit 7
set to 1 and the last byte would have bit 7 set to 0, meaning the first 3
values would be >0x7F and the last value should be < 0x80
So is ASN.1 not used for the RequestID field?
I know OIDs *are* ASN.1 encoded, but how about the other fields?
How about the data field in a varbind?
Thanks in advance,
Didier
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