Added processing of disco#info queries as I learned this is good style (thx jonasw).

feed-to-muc.go

@@ -174,22 +174,44 @@ func pingMUC(client *xmpp.Client, botJid string, Muc string, MucNick string) {
 
 		// Check for result IQ as long as there was no reply yet.
 		for (time.Since(pingSent).Seconds() < 10.0) && (pingReceived == false) {
-			// Receive Stanzas.
+			// Receive stanzas. ToDo: Receive stanzas continiously without 30s delay.
 			stanza, err := client.Recv()
 			if err != nil {
 				log.Fatal(err)
 			}
 
-			// Check IQs for type result and UID.
+			// Check IQs for ping results and disco#info queries.
 			switch v := stanza.(type) {
 			case xmpp.IQ:
 				if (v.Type == "error") && (v.ID == id) {
 					log.Fatal("MUC not available.")
 				}
+
 				if (v.Type == "result") && (v.ID == id) {
 					pingReceived = true
 				}
-				break
+
+				if v.Type == "get" {
+					// Reply to disco#info requests according to https://xmpp.org/extensions/xep-0030.html.
+					if strings.Contains(string(v.Query),
+						"<query xmlns='http://jabber.org/protocol/disco#info'/>") == true {
+						_, err := client.RawInformation(client.JID(), v.From, v.ID,
+							"result", "<query xmlns='http://jabber.org/protocol/disco#info'>"+
+								"<identity category='client' type='bot' name='feedbot'/>"+
+								"<feature var='http://jabber.org/protocol/disco#info'/></query>")
+						if err != nil {
+							log.Fatal(err)
+						}
+					} else {
+						// Send error replies for all other IQs.
+						_, err := client.RawInformation(client.JID(), v.From, v.ID, "error",
+							string(v.Query))
+						if err != nil {
+							log.Fatal(err)
+						}
+					}
+				}
+
 			default:
 				break
 			}