diff --git a/respond/collector.go b/respond/collector.go
index 6d2156b..d2cc54d 100644
--- a/respond/collector.go
+++ b/respond/collector.go
@@ -1,16 +1,11 @@
 package respond
 
 import (
-	"bytes"
-	"compress/flate"
-	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"time"
 
 	"github.com/bdlm/log"
-	"github.com/tidwall/gjson"
 
 	"github.com/FreifunkBremen/yanic/data"
 	"github.com/FreifunkBremen/yanic/database"
@@ -74,7 +69,7 @@ func (coll *Collector) listenUDP(iface InterfaceConfig) {
 		}
 	}
 
-	multicastAddress := multicastAddressDefault
+	multicastAddress := MulticastAddressDefault
 	if iface.MulticastAddress != "" {
 		multicastAddress = iface.MulticastAddress
 	}
@@ -88,7 +83,7 @@ func (coll *Collector) listenUDP(iface InterfaceConfig) {
 	if err != nil {
 		log.Panic(err)
 	}
-	conn.SetReadBuffer(maxDataGramSize)
+	conn.SetReadBuffer(MaxDataGramSize)
 
 	coll.connections = append(coll.connections, multicastConn{
 		Conn:             conn,
@@ -213,7 +208,7 @@ func (coll *Collector) SendPacket(destination net.IP) {
 func (coll *Collector) sendPacket(conn *net.UDPConn, destination net.IP) {
 	addr := net.UDPAddr{
 		IP:   destination,
-		Port: port,
+		Port: PortDefault,
 		Zone: conn.LocalAddr().(*net.UDPAddr).Zone,
 	}
 
@@ -247,36 +242,6 @@ func (coll *Collector) parser() {
 	}
 }
 
-func (res *Response) parse(customFields []CustomFieldConfig) (*data.ResponseData, error) {
-	// Deflate
-	deflater := flate.NewReader(bytes.NewReader(res.Raw))
-	defer deflater.Close()
-
-	jsonData, err := ioutil.ReadAll(deflater)
-	if err != nil {
-		return nil, err
-	}
-
-	// Unmarshal
-	rdata := &data.ResponseData{}
-	err = json.Unmarshal(jsonData, rdata)
-
-	rdata.CustomFields = make(map[string]interface{})
-	if !gjson.Valid(string(jsonData)) {
-		log.WithField("jsonData", jsonData).Info("JSON data is invalid")
-	} else {
-		jsonParsed := gjson.Parse(string(jsonData))
-		for _, customField := range customFields {
-			field := jsonParsed.Get(customField.Path)
-			if field.Exists() {
-				rdata.CustomFields[customField.Name] = field.String()
-			}
-		}
-	}
-
-	return rdata, err
-}
-
 func (coll *Collector) saveResponse(addr *net.UDPAddr, res *data.ResponseData) {
 	// Search for NodeID
 	var nodeID string
@@ -328,7 +293,7 @@ func (coll *Collector) saveResponse(addr *net.UDPAddr, res *data.ResponseData) {
 }
 
 func (coll *Collector) receiver(conn *net.UDPConn) {
-	buf := make([]byte, maxDataGramSize)
+	buf := make([]byte, MaxDataGramSize)
 	for {
 		n, src, err := conn.ReadFromUDP(buf)
 
diff --git a/respond/respond.go b/respond/respond.go
index a8e3927..3bc6261 100644
--- a/respond/respond.go
+++ b/respond/respond.go
@@ -1,18 +1,28 @@
 package respond
 
 import (
+	"bytes"
+	"compress/flate"
+	"encoding/json"
+	"io"
+	"io/ioutil"
 	"net"
+
+	"github.com/bdlm/log"
+	"github.com/tidwall/gjson"
+
+	"github.com/FreifunkBremen/yanic/data"
 )
 
 const (
 	// default multicast group used by announced
-	multicastAddressDefault = "ff05:0:0:0:0:0:2:1001"
+	MulticastAddressDefault = "ff05:0:0:0:0:0:2:1001"
 
 	// default udp port used by announced
-	port = 1001
+	PortDefault = 1001
 
 	// maximum receivable size
-	maxDataGramSize = 8192
+	MaxDataGramSize = 8192
 )
 
 // Response of the respond request
@@ -20,3 +30,53 @@ type Response struct {
 	Address *net.UDPAddr
 	Raw     []byte
 }
+
+func NewRespone(res *data.ResponseData, addr *net.UDPAddr) (*Response, error) {
+	buf := new(bytes.Buffer)
+	flater, err := flate.NewWriter(buf, flate.BestCompression)
+	if err != nil {
+		return nil, err
+	}
+	defer flater.Close()
+
+	if err = json.NewEncoder(flater).Encode(res); err != nil {
+		return nil, err
+	}
+
+	err = flater.Flush()
+
+	return &Response{
+		Raw:     buf.Bytes(),
+		Address: addr,
+	}, err
+}
+
+func (res *Response) parse(customFields []CustomFieldConfig) (*data.ResponseData, error) {
+	// Deflate
+	deflater := flate.NewReader(bytes.NewReader(res.Raw))
+	defer deflater.Close()
+
+	jsonData, err := ioutil.ReadAll(deflater)
+	if err != nil && err != io.ErrUnexpectedEOF {
+		return nil, err
+	}
+
+	// Unmarshal
+	rdata := &data.ResponseData{}
+	err = json.Unmarshal(jsonData, rdata)
+
+	rdata.CustomFields = make(map[string]interface{})
+	if !gjson.Valid(string(jsonData)) {
+		log.WithField("jsonData", jsonData).Info("JSON data is invalid")
+	} else {
+		jsonParsed := gjson.Parse(string(jsonData))
+		for _, customField := range customFields {
+			field := jsonParsed.Get(customField.Path)
+			if field.Exists() {
+				rdata.CustomFields[customField.Name] = field.String()
+			}
+		}
+	}
+
+	return rdata, err
+}
diff --git a/respond/respond_test.go b/respond/respond_test.go
new file mode 100644
index 0000000..73c0415
--- /dev/null
+++ b/respond/respond_test.go
@@ -0,0 +1,20 @@
+package respond
+
+import (
+	"net"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewRespone(t *testing.T) {
+	assert := assert.New(t)
+
+	addr, err := net.ResolveUDPAddr("udp6", "[fe80::2]:8080")
+	assert.NoError(err)
+
+	data, err := NewRespone(nil, addr)
+	assert.NoError(err)
+	assert.Equal("[fe80::2]:8080", data.Address.String())
+	assert.Equal([]uint8{0xca, 0x2b, 0xcd, 0xc9, 0xe1, 0x2, 0x0, 0x0, 0x0, 0xff, 0xff}, data.Raw)
+}