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--- projects:neopixel-bandwidth-room-light [2017-10-15 08:32]
trinitor [Test]
+++ projects:neopixel-bandwidth-room-light [2017-10-15 08:44]
trinitor [SNMP Example]
@@ Line 247: / Line 247: @@
 </code>
-===== SNMP Example ======
+===== snmp2neopixel.sh ======
 <code>
-Todo
+#!/bin/bash
+GATEWAYIP=192.168.x.1    #Your gateway
+SNMPCOMMUNITY=public     #snmp read community string
+INTNUMBER=1              #Interface number in SNMP; snmpwalk -v2c -c readcommstring <IP> | grep IF-MIB::ifName
+MESASURETIME=1           #Time in seconds between messurment
+INBOUNDBANDWIDTH=300000  #Max Interface bandwidth
+OUTBOUNDBANDWIDTH=100000 #Max Interface bandwidth
+MAXBRIGHTNESS=32         #NeoPixel brightness (max value = 255)
+NEOPIXELIP=192.168.x.10  #IP of your ESP8266
+NEOPIXELPORT=2342        #UDP port of your ESP8266
+while true; do
+  TIME=$(date +%s)
+  OUT=$(snmpget -v2c -c $SNMPCOMMUNITY $GATEWAYIP ifOutOctets.$INTNUMBER | awk '{print $4}')
+  IN=$(snmpget -v2c -c $SNMPCOMMUNITY $GATEWAYIP ifInOctets.$INTNUMBER | awk '{print $4}')
+  if [ -z "$OUT" ] || [ -z "$IN" ]; then
+     msg="Unable to retrieve SNMP info."
+     exit 2
+  else
+     sleep $MESASURETIME
+     TIME2=$(date +%s)
+     OUT2=$(snmpget -v2c -c $SNMPCOMMUNITY $GATEWAYIP ifOutOctets.$INTNUMBER | awk '{print $4}')
+     IN2=$(snmpget -v2c -c $SNMPCOMMUNITY $GATEWAYIP ifInOctets.$INTNUMBER | awk '{print $4}')
+     if [ "$OUT2" -gt "$OUT" ] || [ "$IN2" -gt "$IN" ] ; then
+       if [ "$TIME2" == "$TIME" ]; then
+         TIME=1
+       fi
+       DELTAOUT=$(echo "$OUT2-$OUT" | bc)
+       DELTAIN=$(echo "$IN2-$IN" | bc)
+       DELTATIME=$(echo "$TIME2-$TIME" | bc)
+       INPUTBW=$(echo "$DELTAIN/$DELTATIME/1024" | bc)
+       OUTPUTBW=$(echo "$DELTAOUT/$DELTATIME/1024" | bc)
+       echo Inbound: $INPUTBW"KB/s"
+       echo Outbound: $OUTPUTBW"KB/s"
+       INPUTPERCENT=$(echo "$DELTAIN*8/$DELTATIME/$INBOUNDBANDWIDTH" | bc)
+       OUTPUTPERCENT=$(echo "$DELTAOUT*8/$DELTATIME/$OUTBOUNDBANDWIDTH" | bc)
+       echo Inbound %: $INPUTPERCENT"%"
+       echo Outbound %: $OUTPUTPERCENT"%"
+       RED=$(echo "$MAXBRIGHTNESS*$OUTPUTPERCENT/100" | bc)
+       GREEN=$(echo "$MAXBRIGHTNESS*$INPUTPERCENT/100" | bc)
+       echo "{red:$RED,green:$GREEN}"
+       echo "{red:$RED,green:$GREEN}" | nc -w 0 -u $NEOPIXELIP $NEOPIXELPORT
+     else
+      echo "no change"
+    fi
+  fi
+done
 </code>

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