[TASK] do not send multicast request (#121)

config_example.toml

@@ -25,6 +25,9 @@ ifname = "br-ffhb"
 # ip address which is used for sending
 # (optional - without definition used a address of ifname)
 ip_address = "fd2f:5119:f2d::5"
+# disable sending multicast respondd request
+# (for receiving only respondd packages e.g. database respondd)
+#send_no_request = false
 # multicast address to destination of respondd
 # (optional - without definition used batman default ff02::2:1001)
 multicast_address = "ff05::2:1001"

docs/docs_configuration.md

@@ -21,6 +21,7 @@ collect_interval = "1m"
 [[respondd.interfaces]]
 ifname             = "br-ffhb"
 #ip_address        = "fe80::..."
+#send_no_request   = false
 #multicast_address = "ff02::2:1001"
 #port              = 10001
 ```
@@ -100,6 +101,7 @@ It is possible to have multiple interfaces, just add this group again with new p
 [[respondd.interfaces]]
 ifname             = "br-ffhb"
 #ip_address        = "fe80::..."
+#send_no_request   = false
 #multicast_address = "ff02::2:1001"
 #port              = 10001
 ```
@@ -124,6 +126,16 @@ ip_address          = "fe80::..."
 ```
 {% endmethod %}
 
+### send_no_request
+{% method %}
+Disable sending multicast respondd request.
+For receiving only respondd packages e.g. database respondd.
+{% sample lang="toml" %}
+```toml
+send_no_request     = true
+```
+{% endmethod %}
+
 ### multicast_address
 {% method %}
 Multicast address to destination of respondd.

respond/collector.go

@@ -18,7 +18,6 @@ import (
 // Collector for a specificle respond messages
 type Collector struct {
 	connections []multicastConn // UDP sockets
-	port        int
 
 	queue        chan *Response // received responses
 	db           database.Connection
@@ -30,6 +29,7 @@ type Collector struct {
 
 type multicastConn struct {
 	Conn             *net.UDPConn
+	SendRequest      bool
 	MulticastAddress net.IP
 }
 
@@ -89,6 +89,7 @@ func (coll *Collector) listenUDP(iface InterfaceConfig) {
 
 	coll.connections = append(coll.connections, multicastConn{
 		Conn:             conn,
+		SendRequest:      !iface.SendNoRequest,
 		MulticastAddress: net.ParseIP(multicastAddress),
 	})
 
@@ -163,8 +164,10 @@ func (coll *Collector) sendOnce() {
 func (coll *Collector) sendMulticast() {
 	log.Println("sending multicasts")
 	for _, conn := range coll.connections {
+		if conn.SendRequest {
 			coll.sendPacket(conn.Conn, conn.MulticastAddress)
 		}
+	}
 }
 
 // Send unicast packets to nodes that did not answer the multicast

respond/config.go

@@ -25,6 +25,7 @@ type SiteConfig struct {
 type InterfaceConfig struct {
 	InterfaceName    string `toml:"ifname"`
 	IPAddress        string `toml:"ip_address"`
+	SendNoRequest    bool   `toml:"send_no_request"`
 	MulticastAddress string `toml:"multicast_address"`
 	Port             int    `toml:"port"`
 }