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dea0b7176e
See Issue mentioned in librenms/librenms: #14428 OpenWRT example scripts give bad output if wireless interface is down. Redirect the iw/iwlist command stderr output to /dev/null. Co-authored-by: 00gh <00gh>
30 lines
1.1 KiB
Bash
Executable File
30 lines
1.1 KiB
Bash
Executable File
#!/bin/sh
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# wlSNR.sh
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# Returns wlSNR, Signal-to-Noise ratio in dB
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# Arguments:
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# $1: targeted interface
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# $2: desired result (sum, avg, min, max)
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# Check number of arguments
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if [ $# -ne 2 ]; then
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/bin/echo "Usage: wlSNR.sh interface result"
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/bin/echo "Incorrect script usage, exiting."
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exit 1
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fi
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# Calculate result. Sum just for debug, and return integer (safest / easiest)
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snrlist=$(/usr/bin/iwinfo "$1" assoclist 2>/dev/null | /usr/bin/cut -s -d "/" -f 2 | /usr/bin/cut -s -d "(" -f 2 | /usr/bin/cut -s -d " " -f 2 | /usr/bin/cut -s -d ")" -f 1)
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if [ "$2" = "sum" ]; then
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result=$(/bin/echo "$snrlist" | /usr/bin/awk -F ':' '{sum += $1} END {printf "%d\n", sum}')
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elif [ "$2" = "avg" ]; then
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result=$(/bin/echo "$snrlist" | /usr/bin/awk -F ':' '{sum += $1} END {printf "%d\n", sum/NR}')
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elif [ "$2" = "min" ]; then
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result=$(/bin/echo "$snrlist" | /usr/bin/awk -F ':' 'NR == 1 || $1 < min {min = $1} END {printf "%d\n", min}')
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elif [ "$2" = "max" ]; then
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result=$(/bin/echo "$snrlist" | /usr/bin/awk -F ':' 'NR == 1 || $1 > max {max = $1} END {printf "%d\n", max}')
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fi
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# Return snmp result
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echo "$result"
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