| lwIP
    2.0.3
    Lightweight IP stack | 
#include <snmp_core.h>
| Data Fields | |
| u8_t | node_type | 
| u32_t | oid | 
node "base class" layout, the mandatory fields for a node
| u8_t snmp_node::node_type | 
one out of SNMP_NODE_TREE or any leaf node type (like SNMP_NODE_SCALAR)
| u32_t snmp_node::oid | 
the number assigned to this node which used as part of the full OID