Script to query multiple openwrt access points and check connected clients

wifi_clients.sh

#!/bin/bash
 
# /etc/config/show_wifi_clients.sh
# Shows MAC, IP address and any hostname info for all connected wifi devices
# written for openwrt 12.09 Attitude Adjustment

routers="archer swordsman"
dhcp_host="swordsman"
date +%F_%T
dhcpleases=`ssh root@$dhcp_host cat /tmp/dhcp.leases` 
echo -e "# IP address\tname\tMAC address\tAP"
# list all wireless network interfaces
# (for universal driver; see wiki article for alternative commands)
for routername in $routers; do
        for interface in `ssh root@$routername iwinfo | grep ESSID | cut -f 1 -s -d" "`
        do
                # for each interface, get mac addresses of connected stations/clients
                maclist=`ssh root@$routername iwinfo $interface assoclist | grep dBm | cut -f 1 -s -d" "`
                # for each mac address in that list...
                for mac in $maclist
                do
#                       if [ "$mac" != "0C:8F:FF:8E:DD:C6" ] || [ "$mac" != "54:F2:01:A0:06:52" ]  ; then
#                                 break
#                       fi
                        # If a DHCP lease has been given out by dnsmasq, save it.
                        ip="UNKN"
                        host=""
                        ip=`echo "$dhcpleases" | cut -f 2,3,4 -s -d" " | grep -i $mac | cut -f 2 -s -d" "`
                        host=`echo "$dhcpleases" | cut -f 2,3,4 -s -d" " | grep -i $mac | cut -f 3 -s -d" "`
                        # ... show the mac address:
                        echo -e "$ip\t$host\t$mac\t$routername"
                done
        done
done

https://github.com/dersimn/owrtwifi2mqtt