Create wifi backend abstraction

internal/config/cli.go

@@ -8,6 +8,7 @@ import (
 func declareFlags(o *Config) {
 	flag.StringVar(&o.Bind, "bind", ":8081", "Bind port/socket")
 	flag.StringVar(&o.WifiInterface, "wifi-interface", "wlan0", "WiFi interface name")
+	flag.StringVar(&o.WifiBackend, "wifi-backend", "", "WiFi backend to use: 'iwd' or 'wpasupplicant' (required)")
 	flag.BoolVar(&o.UseARPDiscovery, "use-arp-discovery", true, "Use ARP table for device discovery instead of DHCP leases")
 	flag.StringVar(&o.DHCPLeasesPath, "dhcp-leases-path", "/var/lib/dhcp/dhcpd.leases", "Path to DHCP leases file")
 	flag.StringVar(&o.ARPTablePath, "arp-table-path", "/proc/net/arp", "Path to ARP table file")

internal/config/config.go

@@ -11,6 +11,7 @@ import (
 type Config struct {
 	Bind                 string
 	WifiInterface        string
+	WifiBackend          string
 	UseARPDiscovery      bool
 	DHCPLeasesPath       string
 	ARPTablePath         string
@@ -75,6 +76,11 @@ func ConsolidateConfig() (opts *Config, err error) {
 		return
 	}
 
+	// Validate configuration
+	if opts.WifiBackend != "iwd" && opts.WifiBackend != "wpasupplicant" {
+		log.Fatalf("wifi-backend must be set to 'iwd' or 'wpasupplicant' (got: '%s')", opts.WifiBackend)
+	}
+
 	return
 }