Cacti/OpenWRT

/etc/config/snmpd

config exec
        option name     iwinfo
        option prog     /usr/local/bin/iwinfo.sh
        option args     wlan0

config exec
        option name     iwinfo
        option prog     /usr/local/bin/iwinfo.sh
        option args     wlan1

/usr/local/bin/iwinfo.sh

#!/bin/bash

if [ ${#} -ne 1 ]; then
  echo "Usage: $0 <interface>"
  exit 0
fi

INFO=`iwinfo ${1} info`
CHANNEL=`echo "${INFO}" | sed -n 's/.*Channel:\ \(.*\)\ (.*)/\1/p'`
TXPOWER=`echo "${INFO}" | sed -n 's/.*Tx-Power:\ \(.*\)\ dBm.*/\1/p'`
SIGNAL=`echo "${INFO}" | sed -n 's/.*Signal:\ -\(.*\)\ dBm\ \ Noise.*/\1/p'`
NOISE=`echo "${INFO}" | sed -n 's/.*Noise:\ -\(.*\)\ dBm.*/\1/p'`
BITRATE=`echo "${INFO}" | sed -n 's/.*Bit\ Rate:\ \(.*\)\ MBit.*/\1/p'`

echo "channel:${CHANNEL} txpower:${TXPOWER} signal:${SIGNAL} noise:${NOISE} bitrate:${BITRATE}"
#echo ${CHANNEL}
#echo ${TXPOWER}
#echo ${SIGNAL}
#echo ${NOISE}
#echo ${BITRATE}
exit 0

/usr/share/cacti/resource/snmp_queries/iwinfo.xml

<interface>
        <name>Get iwinfo information</name>
        <description>Get statistics of the radio interface</description>
        <index_order_type>numeric</index_order_type>
        <oid_index>.1.3.6.1.4.1.2021.8.1.1</oid_index>

        <fields>
                <extIndex>
                        <name>Index</name>
                        <method>walk</method>
                        <source>value</source>
                        <direction>input</direction>
                        <oid>.1.3.6.1.4.1.2021.8.1.1</oid>
                </extIndex>
                <extNames>
                        <name>Device</name>
                        <method>walk</method>
                        <source>value</source>
                        <direction>input</direction>
                        <oid>.1.3.6.1.4.1.2021.8.1.2</oid>
                </extNames>
                <extOutput>
                        <name>Value</name>
                        <method>walk</method>
                        <source>value</source>
                        <direction>output</direction>
                        <oid>.1.3.6.1.4.1.2021.8.1.101</oid>
                </extOutput>
        </fields>
</interface>