uClinux on LPC1788: how to useSNMP for remote management of embedded device

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uClinux on LPC1788: how to useSNMP for remote management of embedded device

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NXP Employee
NXP Employee
Content originally posted in LPCWare by Vladimir Khusainov on Fri Feb 03 08:02:29 MST 2012
Here is a sample session showing some basic uses of SNMP for remote management of an LPC1788-based device. This session was run under uClinux on an Embedded Artist's LPC1788 board.

After reset, U-boot comes up from embedded Flash and proceeds to boot uClinux onto the board:

<code>
U-Boot 2010.03-linux-cortexm-1.4.0 (Feb 03 2012 - 17:57:09)

CPU  : LPC178x/7x series (Cortex-M3)
Freqs: SYSTICK=108MHz,EMCCLK=54MHz,PCLK=54MHz
Board: EA-LPC1788 rev 1
DRAM:  32 MB
Flash:  4 MB
...
Starting kernel ...

Linux version 2.6.33-arm1 (psl@ocean.emcraft.com) (gcc version 4.4.1 (Sourcery G++ Lite 2010q1-189) ) #4 Fri Feb 3 18:27:11 MSK 2012
...
init started: BusyBox v1.17.0 (2012-02-03 17:58:32 MSK)
~ #
</code>

From the shell prompt on the target, I start an SNMP agent:

<code>
~ # snmpd -C -c /etc/snmpd.conf -Le -fNET-SNMP version 5.6.1
</code>

Now, I am able to query my LPC1788 device remotely using standard SNMP tools. For instance,  here is how this is done from a Linux PC box:

<code>
[psl@ocean LPC]$ snmpget -v1 -c public 172.17.3.109 .1.3.6.1.2.1.1.1.0
SNMPv2-MIB::sysDescr.0 = STRING: Linux ea-lpc1788 2.6.33-arm1 #4 Fri Feb 3 18:27:11 MSK 2012 armv7ml
</code>

Back to the target, here is how I send a trap event to remote management tools:

<code>
~ # snmptrap -v 1 -c public 172.17.0.212 '1.2.3.4.5.6' '192.193.194.195' 6 99 '55' 1.11.12.13.14.15 s "I'm here"
</code>

When I check SNMP traps on the host, the trap from LPC1788 is reported as appropriate:

<code>
[root@pvr psl]# snmptrapd -C -c /home/work/psl/SF/release/snmptrapd.conf -Le -fNET-SNMP version 5.5
2012-02-03 18:35:08 192.193.194.195(via UDP: [172.17.3.109]:55085->[172.17.0.212]) TRAP, SNMP v1, community public
iso.2.3.4.5.6 Enterprise Specific Trap (99) Uptime: 0:00:00.05
iso.11.12.13.14.15 = STRING: "I'm here"
</code>

More info on how SNMP can be used with uClinux running on Cortex-M is available from documentation on www.emcraft.com
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