In the AgentX communication the subagent chooses the byte order used. To reduce
code complexity, we decide to use compile-time selected byte order in PDU sent.
Supported options are:
- SNMP_NATIVE: use native CPU byte order
- SNMP_NETWORK_BYTE_ORDER: use big endian in PDUs, i.e. network byte order
It is recommended not to used both options at the same time (even it is possible
on big endian platforms).