My first GoLang attempt
I was in need of a small CLI utility to make an API request when a device connected to my WiFi network, but only after it had been missing for a certain period of time.
The idea is to have my smart lights automatically turn on when I arrive home, as the Location Services widget provided by IFTTT is extremely unreliable.
Go seemed like a good fit because I could make use of Goroutines.
This application uses the GoPacket library provided by Google to make ARP requests on a given interface to all valid IPv4 addresses to detect the prescence of a known set of MAC addresses.
It keeps track of when the device was last seen, and if it has been missing for a given period of time and re-appears, it makes a GET request to a give URI.
Compile watch.go, then execute as root:
watch [-list] <interface> <config file>
-list will produce a list of all available interfaces on your machine
<interface> the interface to scan
<config file> a JSON configuration file (see below)
The config file is a simple JSON array specifying the following parameters:
[
{
"HWAddress": "00:00:00:00:00:00",
"Duration": "1h",
"URL": "https://some.valid.call"
}
]You can specify as many devices you wish, each with their own configuration.
There is also a very rudimentary web server to keep track of the status of the application, you can access it on:
http://<IP or Host>:8080