Thanks for the quick response, Here is what I get for GetLinkByName
//busctl call org.freedesktop.network1 /org/freedesktop/network1 org.freedesktop.network1.Manager GetLinkByName s wlan0
//io 4 "/org/freedesktop/network1/link/_34"
1. I am subscribing to signal like below, Does that work?
g_dbus_connection_signal_subscribe (connection,// GDBusConnection
/*"org.freedesktop.network1"*/ NULL,//sender name to match on (unique or well-known name) or NULL to listen from all senders
"org.freedesktop.DBus.Properties",//D-Bus interface name to match on or NULL to match on all interfaces
"PropertiesChanged",//D-Bus signal name to match on or NULL to match on all signals
"/org/freedesktop/network1/link/_34",//object path to match on or NULL to match on all object paths
NULL,//contents of first string argument to match on or NULL to match on all kinds of arguments
G_DBUS_SIGNAL_FLAGS_NONE,//GDBusSignalFlags describing how arg0 is used in subscribing to the signal
linkStatusMonitorCallBack,//callback to invoke when there is a signal matching the requested data
nullptr,//user data to pass to callback
NULL);//function to free user_data with when subscription is removed or NULL
Thanks,
Ashok
/org/freedesktop/network1 is the toplevel object that represents the networkd daemon as a whole. Interface-specific signals would be sent for the object paths of the individual interfaces, so you need to either:a) call GetLinkByName() on the toplevel object to find the interface object, and then subscribe for signals on that;or b) instead of filtering by path='/xx', filter by path_namespace='/xx' so that it will also match child objects.On Tue, Feb 6, 2024 at 10:30 AM ashok athukuri <athukuriashok@xxxxxxxxx> wrote:Hello All,I'm trying to use DBUS signal "PropertiesChanged" of org.freedesktop.network1 /org/freedesktop/network1 to detect network interface is up or down OR the speed of the interface is changed.
Is it possible? using a subscription to "PropertiesChanged" signal via the below interface or PATH ?
If yes, how to test those, Currently I don't see any anything on my dbus-monitor.
Here is how I am testing :# dbus-monitor --system "type='signal',path='/org/freedesktop/network1'"
#ifconfig wlan0 down
# busctl introspect org.freedesktop.network1 /org/freedesktop/network1
NAME TYPE SIGNATURE RESULT/VALUE FLAGS
org.freedesktop.DBus.Introspectable interface - - -
.Introspect method - s -
org.freedesktop.DBus.Peer interface - - -
.GetMachineId method - s -
.Ping method - - -
org.freedesktop.DBus.Properties interface - - -
.Get method ss v -
.GetAll method s a{sv} -
.Set method ssv - -
.PropertiesChanged signal sa{sv}as - -
org.freedesktop.network1.Manager interface - - -
.Describe method - s -
.DescribeLink method i s -
.ForceRenewLink method i - -
.GetLinkByIndex method i so -
.GetLinkByName method s io -
.ListLinks method - a(iso) -
.ReconfigureLink method i - -
.Reload method - - -
.RenewLink method i - -
.RevertLinkDNS method i - -
.RevertLinkNTP method i - -
.SetLinkDNS method ia(iay) - -
.SetLinkDNSEx method ia(iayqs) - -
.SetLinkDNSOverTLS method is - -
.SetLinkDNSSEC method is - -
.SetLinkDNSSECNegativeTrustAnchors method ias - -
.SetLinkDefaultRoute method ib - -
.SetLinkDomains method ia(sb) - -
.SetLinkLLMNR method is - -
.SetLinkMulticastDNS method is - -
.SetLinkNTP method ias - -
.AddressState property s "routable" emits-change
.CarrierState property s "carrier" emits-change
.IPv4AddressState property s "routable" emits-change
.IPv6AddressState property s "routable" emits-change
.NamespaceId property t 4026531840 const
.OnlineState property s "partial" emits-change
.OperationalState property s "routable" emits-change
root@MK3AC-WS100269:/var/lib/evse/cache#
Thanks,Ashok
--Mantas Mikulėnas
