Text Based Wi-Fi Analyzer for MacOS Terminal

macos-wifi-analyzer.sh

#!/usr/bin/env bash

SLEEP_INTERVAL=5
LOG_FILE="/tmp/wifi_monitor_$(date -u +%Y-%m-%d).json"

__get_wifi_info(){
    sudo wdutil info | egrep "(RSSI|Tx Rate|^\s*Channel\s*\:)" 
}

__get_rssi(){
    data="$1"
    echo "$data" | awk -F ':' 'NR==1{ print $2 }' | xargs
}

__get_tx_rate(){
    data="$1"
    echo "$data" | awk -F ':' 'NR==2{ print $2 }' | xargs
}

__get_channel(){
    data="$1"
    echo "$data" | awk -F ':' 'NR==3{ print $2 }' | xargs
}

while true; do
    wifi_data="$(__get_wifi_info)"
    rssi="$(__get_rssi "${wifi_data}")"
    tx_rate="$(__get_tx_rate "${wifi_data}")"
    channel="$(__get_channel "${wifi_data}")"
    timestamp="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"

    json_output="$(jq \
        --null-input \
        --compact-output \
        --arg timestamp "$timestamp" \
        --arg rssi "$rssi" \
        --arg tx_rate "$tx_rate" \
        --arg channel "$channel" \
        '{timestamp: $timestamp, rssi: $rssi, 
        tx_rate: $tx_rate, channel: $channel}'
    )"

    echo "$json_output" >> "$LOG_FILE"
    sleep "$SLEEP_INTERVAL"
done