With the custom builds of the Asus Merlin code, there seems to be a small gap in being able to montor the devices. The following scripts allow for getting client and AP information beyond what SNMP gives.
This will auto-create crontab entry
Found what I cared about from:
The forward script itself uses wl to get metrics to forward
https://wiki.dd-wrt.com/wiki/index.php/Wl_command
There is no bash on the router, so I tried to keep this as simple as possible
Merlin has internal to it: curl, wc, grep, sed, awk, hostname, crond, nc
Remember: that some binaries do not have all the normal options (IE nc)