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5 This is a brief introduction how to use and configure the SNMP agent.
6 Note the agent uses the raw-API UDP interface so you may also want to
7 read rawapi.txt to gain a better understanding of the SNMP message handling.
18   relative. SNMP is simple compared to the complex ISO network
30   Writing to or changing the ARP and IP address and route
41   All routes are considered to be up (U).
49   to use pbuf-chains. Larger payloads than the minimum
51   PBUF_POOL_SIZE and IP_REASS_BUFSIZE are set to match your
57 First of all you'll need to add the following define
58 to your local lwipopts.h:
63 and some snmp headers in lwip/src/include/lwip to your makefile.
65 Note you'll might need to adapt you network driver to update
71 The following function calls must be made in your program to
75 to non-volatile memory for sysContact, sysLocation,
82 Additionally you may want to set
88 Also before starting the agent you need to setup
95 the call to udp_init().
101 An alternative way to update the SNMP uptime timestamp is to do a call like
102 snmp_add_sysuptime(100) each 1000ms (which is bigger "step", but call to
103 a lower frequency). Another one is to not call snmp_inc_sysuptime() or
104 snmp_add_sysuptime(), and to define the SNMP_GET_SYSUPTIME(sysuptime) macro.
106 snmp_get_sysuptime(u32_t *value), and enable to change "sysuptime" value only
107 when it's queried (any function which need "sysuptime" have to call
114 If want to extend the agent with your own private MIB you'll need to
115 add the following define to your local lwipopts.h:
121 so you're required to do some serious coding if you enable this!
123 Note the lwIP enterprise ID (26381) is assigned to the lwIP project,
127 If you need to create your own private MIB you'll need
128 to apply for your own enterprise ID with IANA: http://www.iana.org/numbers.html 
130 You can set it by passing a struct snmp_obj_id to the agent
135 This to ensure correct getnext operation.
172 to preserve precious RAM on small microcontrollers.