xbar bitbar plugin for wifi speed and name - I use it to find weak wifi spots or confirm that the wifi signal jumps

wifi_level.30s.sh

#!/usr/bin/env bash

# <bitbar.title>WiFi level</bitbar.title>
# <bitbar.version>v1.0</bitbar.version>
# <bitbar.author>Alex Sorokoletov</bitbar.author>
# <bitbar.author.github>alexsorokoletov</bitbar.author.github>
# <bitbar.desc>TX rate/Link speed of the connected WiFi</bitbar.desc>
# <bitbar.dependencies></bitbar.dependencies>
# <bitbar.abouturl>https://sorokoletov.com/</bitbar.abouturl>

# Kudos to https://github.com/Powerlevel9k/powerlevel9k/issues/317
# place this file in /Users/user/bitbar-plugins/

zsh_wifi_signal(){
        local output=$(/System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport -I) 
        local airport=$(echo $output | grep 'AirPort' | awk -F': ' '{print $2}')
        local theme=$(defaults read -g AppleInterfaceStyle 2>&1)

        if [ "$airport" = "Off" ]; then
                if [ "$theme" = "Dark" ]; then
                        echo -n "Wifi Off|color=white"
                else
                        echo -n "Wifi Off|color=black"
                fi
        else
                local ssid=$(echo "$output" | grep ' SSID' | awk -F': ' '{print $2}')
                local speed=$(echo "$output" | grep 'lastTxRate' | awk -F': ' '{print $2}')
                local color='color=yellow'

                [[ $speed -gt 100 ]] && color='color=green'
                [[ $speed -lt 50 ]] && color='color=red'

                echo "$ssid $speed Mb/s|$color"
        fi
}

zsh_wifi_signal

You might want to change color=green to color=limegreen based on your dark/light theme and color preferences.