Another Example
writeVarbind(0, 0, "ifIndex", ...);
writeVarbind(0, 1, "ifType", ...);
snmpsend(0, 2, GETNEXT, ...);
readVarbind(0, 0, oid1, ...);
readVarbind(0, 1, oid2, ...);
/* leave OIDs alone, now varbindlist #0 is set up for next step
if (oidncmp(oid1, "ifIndex”, oidlen(“ifIndex”)))