Monitor for change of SSID/Connection

dbusnetwatch.go

package main

import (
	"fmt"
	"os"

	"github.com/godbus/dbus"
)

// dbus-monitor --system "type='signal',sender='org.freedesktop.NetworkManager',interface='org.freedesktop.NetworkManager'"

func main() {
	conn, err := dbus.SystemBus()
	if err != nil {
		fmt.Fprintln(os.Stderr, "Failed to connect to session bus:", err)
		os.Exit(1)
	}

	call := conn.BusObject().Call("org.freedesktop.DBus.AddMatch", 0,
		"type='signal',path='/org/freedesktop/NetworkManager/Devices/2',interface='org.freedesktop.NetworkManager.Device.Wireless',sender='org.freedesktop.NetworkManager'")

	// call := conn.BusObject().Call("org.freedesktop.DBus.AddMatch", 0,
	// 	"type='signal',path='/org/freedesktop/DBus',interface='org.freedesktop.DBus',sender='org.freedesktop.DBus'")

	// Working
	// call := conn.BusObject().Call("org.freedesktop.DBus.AddMatch", 0,
	// 	"type='signal',path='/org/kde/Solid/PowerManagement/Actions/BrightnessControl',interface='org.kde.Solid.PowerManagement.Actions.BrightnessControl',sender='org.kubuntu.NotificationHelper'")

	fmt.Printf("\n The call object is \n %#v \n", call)
	c := make(chan *dbus.Signal, 10)
	conn.Signal(c)
	for v := range c {

		for _, ival := range v.Body {

			mytype, isok := ival.(map[string]dbus.Variant)
			if isok {
				keys := []string{"ActiveAccessPoint", "ActiveConnection"}

				// Available properties that changed can be seen here
				// for key, _ := range mytype {
				// 	fmt.Printf("%s, ", key)
				// }

				for _, key := range keys {

					val, ok := mytype[key]
					if ok {

						activeobj := conn.Object("org.freedesktop.NetworkManager", val.Value().(dbus.ObjectPath))
						if key == "ActiveAccessPoint" {
							name, err := activeobj.GetProperty("org.freedesktop.NetworkManager.AccessPoint.Ssid")

							if err != nil {
								fmt.Println("Error getting ssid : ", err)
							} else {
								fmt.Printf("\nAP Name = %s", name.Value().([]byte))
							}
						} else {

							ssid, err := activeobj.GetProperty("org.freedesktop.NetworkManager.Connection.Active.Id")

							if err != nil {
								fmt.Println("Error getting ssid : ", err)
							} else {
								fmt.Printf("\nConnName  = %s", ssid.Value().(string))
							}
						}
					}
				}
			}

		}

	}
}