diff --git a/data/nodeinfo_test.go b/data/nodeinfo_test.go
new file mode 100644
index 0000000..40f7889
--- /dev/null
+++ b/data/nodeinfo_test.go
@@ -0,0 +1,26 @@
+package data
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNodeinfoBatAddresses(t *testing.T) {
+	assert := assert.New(t)
+	batIface := &BatInterface{
+		Interfaces: struct {
+			Wireless []string `json:"wireless,omitempty"`
+			Other    []string `json:"other,omitempty"`
+			Tunnel   []string `json:"tunnel,omitempty"`
+		}{
+			Wireless: nil,
+			Other:    []string{"aa:aa:aa:aa:aa", "aa:aa:aa:aa:ab"},
+			Tunnel:   []string{},
+		},
+	}
+
+	addr := batIface.Addresses()
+	assert.NotNil(addr)
+	assert.Equal([]string{"aa:aa:aa:aa:aa", "aa:aa:aa:aa:ab"}, addr)
+}
diff --git a/database/all/internal.go b/database/all/internal.go
index f1121d0..8a58b66 100644
--- a/database/all/internal.go
+++ b/database/all/internal.go
@@ -1,6 +1,7 @@
 package all
 
 import (
+	"log"
 	"time"
 
 	"github.com/FreifunkBremen/yanic/database"
@@ -12,12 +13,23 @@ type Connection struct {
 	list []database.Connection
 }
 
-func Connect(configuration interface{}) (database.Connection, error) {
+func Connect(allConnection map[string]interface{}) (database.Connection, error) {
 	var list []database.Connection
-	allConnection := configuration.(map[string][]interface{})
 	for dbType, conn := range database.Adapters {
-		dbConfigs := allConnection[dbType]
+		configForType := allConnection[dbType]
+		if configForType == nil {
+			log.Printf("the output type '%s' has no configuration\n", dbType)
+			continue
+		}
+		dbConfigs, ok := configForType.([]map[string]interface{})
+		if !ok {
+			log.Panicf("the output type '%s' has the wrong format\n", dbType)
+		}
+
 		for _, config := range dbConfigs {
+			if c, ok := config["enable"].(bool); ok && !c {
+				continue
+			}
 			connected, err := conn(config)
 			if err != nil {
 				return nil, err
diff --git a/database/all/internel_test.go b/database/all/internel_test.go
index 1a6c647..019c2c0 100644
--- a/database/all/internel_test.go
+++ b/database/all/internel_test.go
@@ -1 +1,156 @@
 package all
+
+import (
+	"errors"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/FreifunkBremen/yanic/database"
+	"github.com/FreifunkBremen/yanic/runtime"
+	"github.com/stretchr/testify/assert"
+)
+
+type testConn struct {
+	database.Connection
+	countNode    int
+	countLink    int
+	countGlobals int
+	countPrune   int
+	countClose   int
+	sync.Mutex
+}
+
+func (c *testConn) InsertNode(node *runtime.Node) {
+	c.Lock()
+	c.countNode++
+	c.Unlock()
+}
+func (c *testConn) GetNode() int {
+	c.Lock()
+	defer c.Unlock()
+	return c.countNode
+}
+func (c *testConn) InsertLink(link *runtime.Link, time time.Time) {
+	c.Lock()
+	c.countLink++
+	c.Unlock()
+}
+func (c *testConn) GetLink() int {
+	c.Lock()
+	defer c.Unlock()
+	return c.countLink
+}
+func (c *testConn) InsertGlobals(stats *runtime.GlobalStats, time time.Time, site string) {
+	c.Lock()
+	c.countGlobals++
+	c.Unlock()
+}
+func (c *testConn) GetGlobal() int {
+	c.Lock()
+	defer c.Unlock()
+	return c.countGlobals
+}
+func (c *testConn) PruneNodes(time.Duration) {
+	c.Lock()
+	c.countPrune++
+	c.Unlock()
+}
+func (c *testConn) GetPrune() int {
+	c.Lock()
+	defer c.Unlock()
+	return c.countPrune
+}
+func (c *testConn) Close() {
+	c.Lock()
+	c.countClose++
+	c.Unlock()
+}
+func (c *testConn) GetClose() int {
+	c.Lock()
+	defer c.Unlock()
+	return c.countClose
+}
+
+func TestStart(t *testing.T) {
+	assert := assert.New(t)
+
+	globalConn := &testConn{}
+	database.RegisterAdapter("a", func(config map[string]interface{}) (database.Connection, error) {
+		return globalConn, nil
+	})
+	database.RegisterAdapter("b", func(config map[string]interface{}) (database.Connection, error) {
+		return globalConn, nil
+	})
+	database.RegisterAdapter("c", func(config map[string]interface{}) (database.Connection, error) {
+		return globalConn, nil
+	})
+	database.RegisterAdapter("d", func(config map[string]interface{}) (database.Connection, error) {
+		return nil, nil
+	})
+	database.RegisterAdapter("e", func(config map[string]interface{}) (database.Connection, error) {
+		return nil, errors.New("blub")
+	})
+	allConn, err := Connect(map[string]interface{}{
+		"a": []map[string]interface{}{
+			map[string]interface{}{
+				"enable": false,
+				"path":   "a1",
+			},
+			map[string]interface{}{
+				"path": "a2",
+			},
+			map[string]interface{}{
+				"enable": true,
+				"path":   "a3",
+			},
+		},
+		"b": nil,
+		"c": []map[string]interface{}{
+			map[string]interface{}{
+				"path": "c1",
+			},
+		},
+		// fetch continue command in Connect
+		"d": []map[string]interface{}{
+			map[string]interface{}{
+				"path": "d0",
+			},
+		},
+	})
+	assert.NoError(err)
+
+	assert.Equal(0, globalConn.GetNode())
+	allConn.InsertNode(nil)
+	assert.Equal(3, globalConn.GetNode())
+
+	assert.Equal(0, globalConn.GetLink())
+	allConn.InsertLink(nil, time.Now())
+	assert.Equal(3, globalConn.GetLink())
+
+	assert.Equal(0, globalConn.GetGlobal())
+	allConn.InsertGlobals(nil, time.Now(), runtime.GLOBAL_SITE)
+	assert.Equal(3, globalConn.GetGlobal())
+
+	assert.Equal(0, globalConn.GetPrune())
+	allConn.PruneNodes(time.Second)
+	assert.Equal(3, globalConn.GetPrune())
+
+	assert.Equal(0, globalConn.GetClose())
+	allConn.Close()
+	assert.Equal(3, globalConn.GetClose())
+
+	_, err = Connect(map[string]interface{}{
+		"e": []map[string]interface{}{
+			map[string]interface{}{},
+		},
+	})
+	assert.Error(err)
+
+	// wrong format -> the only panic in Register
+	assert.Panics(func() {
+		Connect(map[string]interface{}{
+			"e": true,
+		})
+	})
+}
diff --git a/database/database.go b/database/database.go
index e4b1381..c40768d 100644
--- a/database/database.go
+++ b/database/database.go
@@ -25,7 +25,7 @@ type Connection interface {
 }
 
 // Connect function with config to get DB connection interface
-type Connect func(config interface{}) (Connection, error)
+type Connect func(config map[string]interface{}) (Connection, error)
 
 // Adapters is the list of registered database adapters
 var Adapters = map[string]Connect{}
diff --git a/database/database_test.go b/database/database_test.go
index f6f39b7..84e762e 100644
--- a/database/database_test.go
+++ b/database/database_test.go
@@ -6,11 +6,11 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func TestNow(t *testing.T) {
+func TestRegister(t *testing.T) {
 	assert := assert.New(t)
 	assert.Len(Adapters, 0)
 
-	RegisterAdapter("blub", func(config interface{}) (Connection, error) {
+	RegisterAdapter("blub", func(config map[string]interface{}) (Connection, error) {
 		return nil, nil
 	})
 
diff --git a/database/graphite/database.go b/database/graphite/database.go
index bab9c06..c37cbc1 100644
--- a/database/graphite/database.go
+++ b/database/graphite/database.go
@@ -33,18 +33,10 @@ func (c Config) Prefix() string {
 	return c["prefix"].(string)
 }
 
-func (c Config) Enable() bool {
-	return c["enable"].(bool)
-}
-
-func Connect(configuration interface{}) (database.Connection, error) {
+func Connect(configuration map[string]interface{}) (database.Connection, error) {
 	var config Config
 
-	config = configuration.(map[string]interface{})
-
-	if !config.Enable() {
-		return nil, nil
-	}
+	config = configuration
 
 	con := &Connection{
 		client: graphigo.Client{
diff --git a/database/influxdb/database.go b/database/influxdb/database.go
index b8e99d1..a0de00c 100644
--- a/database/influxdb/database.go
+++ b/database/influxdb/database.go
@@ -32,9 +32,6 @@ type Connection struct {
 
 type Config map[string]interface{}
 
-func (c Config) Enable() bool {
-	return c["enable"].(bool)
-}
 func (c Config) Address() string {
 	return c["address"].(string)
 }
@@ -57,12 +54,10 @@ func (c Config) Tags() map[string]interface{} {
 func init() {
 	database.RegisterAdapter("influxdb", Connect)
 }
-func Connect(configuration interface{}) (database.Connection, error) {
+func Connect(configuration map[string]interface{}) (database.Connection, error) {
 	var config Config
-	config = configuration.(map[string]interface{})
-	if !config.Enable() {
-		return nil, nil
-	}
+	config = configuration
+
 	// Make client
 	c, err := client.NewHTTPClient(client.HTTPConfig{
 		Addr:     config.Address(),
diff --git a/database/influxdb/database_test.go b/database/influxdb/database_test.go
index e56e42c..5c2598c 100644
--- a/database/influxdb/database_test.go
+++ b/database/influxdb/database_test.go
@@ -10,6 +10,27 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+func TestConnect(t *testing.T) {
+	assert := assert.New(t)
+
+	conn, err := Connect(map[string]interface{}{
+		"address":  "",
+		"username": "",
+		"password": "",
+	})
+	assert.Nil(conn)
+	assert.Error(err)
+
+	conn, err = Connect(map[string]interface{}{
+		"address":  "http://localhost",
+		"database": "",
+		"username": "",
+		"password": "",
+	})
+	assert.NotNil(conn)
+	assert.NoError(err)
+}
+
 func TestAddPoint(t *testing.T) {
 	assert := assert.New(t)
 
diff --git a/database/influxdb/global_test.go b/database/influxdb/global_test.go
index 2bd0d2e..72d2dec 100644
--- a/database/influxdb/global_test.go
+++ b/database/influxdb/global_test.go
@@ -1,8 +1,11 @@
 package influxdb
 
 import (
+	"sync"
 	"testing"
+	"time"
 
+	"github.com/influxdata/influxdb/client/v2"
 	"github.com/stretchr/testify/assert"
 
 	"github.com/FreifunkBremen/yanic/data"
@@ -20,9 +23,68 @@ func TestGlobalStats(t *testing.T) {
 	fields := GlobalStatsFields(stats[runtime.GLOBAL_SITE])
 	assert.EqualValues(3, fields["nodes"])
 
-	// check TEST_SITE fields
 	fields = GlobalStatsFields(stats[TEST_SITE])
-	assert.EqualValues(2, fields["nodes"])
+	assert.EqualValues(1, fields["nodes"])
+
+	conn := &Connection{
+		points: make(chan *client.Point),
+	}
+
+	global := 0
+	globalSite := 0
+	model := 0
+	modelSite := 0
+	firmware := 0
+	firmwareSite := 0
+	autoupdater := 0
+	autoupdaterSite := 0
+	wg := sync.WaitGroup{}
+	wg.Add(9)
+	go func() {
+		for p := range conn.points {
+			switch p.Name() {
+			case MeasurementGlobal:
+				global++
+				break
+			case "global_site":
+				globalSite++
+				break
+			case CounterMeasurementModel:
+				model++
+				break
+			case "model_site":
+				modelSite++
+				break
+			case CounterMeasurementFirmware:
+				firmware++
+				break
+			case "firmware_site":
+				firmwareSite++
+				break
+			case CounterMeasurementAutoupdater:
+				autoupdater++
+				break
+			case "autoupdater_site":
+				autoupdaterSite++
+				break
+			default:
+				assert.Equal("invalid p.Name found", p.Name())
+			}
+			wg.Done()
+		}
+	}()
+	for site, stat := range stats {
+		conn.InsertGlobals(stat, time.Now(), site)
+	}
+	wg.Wait()
+	assert.Equal(1, global)
+	assert.Equal(1, globalSite)
+	assert.Equal(2, model)
+	assert.Equal(1, modelSite)
+	assert.Equal(1, firmware)
+	assert.Equal(0, firmwareSite)
+	assert.Equal(2, autoupdater)
+	assert.Equal(1, autoupdaterSite)
 }
 
 func createTestNodes() *runtime.Nodes {
@@ -40,9 +102,7 @@ func createTestNodes() *runtime.Nodes {
 			Hardware: data.Hardware{
 				Model: "TP-Link 841",
 			},
-			System: data.System{
-				SiteCode: TEST_SITE,
-			},
+			System: data.System{},
 		},
 	}
 	nodeData.Nodeinfo.Software.Firmware.Release = "2016.1.6+entenhausen1"
diff --git a/database/influxdb/node_test.go b/database/influxdb/node_test.go
index 916c6fb..9e45d86 100644
--- a/database/influxdb/node_test.go
+++ b/database/influxdb/node_test.go
@@ -82,7 +82,9 @@ func TestToInflux(t *testing.T) {
 					},
 				},
 			},
-			LLDP: map[string]data.LLDPNeighbours{},
+			LLDP: map[string]data.LLDPNeighbours{
+				"b-interface": data.LLDPNeighbours{},
+			},
 		},
 	}
 
diff --git a/database/internal_test.go b/database/internal_test.go
new file mode 100644
index 0000000..0280fb7
--- /dev/null
+++ b/database/internal_test.go
@@ -0,0 +1,69 @@
+package database
+
+import (
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/FreifunkBremen/yanic/runtime"
+	"github.com/stretchr/testify/assert"
+)
+
+type testConn struct {
+	Connection
+	countClose int
+	countPrune int
+	sync.Mutex
+}
+
+func (c *testConn) Close() {
+	c.Lock()
+	c.countClose++
+	c.Unlock()
+}
+func (c *testConn) GetClose() int {
+	c.Lock()
+	defer c.Unlock()
+	return c.countClose
+}
+func (c *testConn) PruneNodes(time.Duration) {
+	c.Lock()
+	c.countPrune++
+	c.Unlock()
+}
+func (c *testConn) GetPruneNodes() int {
+	c.Lock()
+	defer c.Unlock()
+	return c.countPrune
+}
+
+func TestStart(t *testing.T) {
+	assert := assert.New(t)
+
+	conn := &testConn{}
+	config := &runtime.Config{
+		Database: struct {
+			DeleteInterval runtime.Duration `toml:"delete_interval"`
+			DeleteAfter    runtime.Duration `toml:"delete_after"`
+			Connection     map[string]interface{}
+		}{
+			DeleteInterval: runtime.Duration{Duration: time.Millisecond * 10},
+		},
+	}
+	assert.Nil(quit)
+
+	Start(conn, config)
+	assert.NotNil(quit)
+
+	assert.Equal(0, conn.GetPruneNodes())
+	time.Sleep(time.Millisecond * 12)
+	assert.Equal(1, conn.GetPruneNodes())
+
+	assert.Equal(0, conn.GetClose())
+	Close(conn)
+	assert.NotNil(quit)
+	assert.Equal(1, conn.GetClose())
+
+	time.Sleep(time.Millisecond * 12) // to reach timer.Stop() line
+
+}
diff --git a/database/logging/file.go b/database/logging/file.go
index c383578..328e307 100644
--- a/database/logging/file.go
+++ b/database/logging/file.go
@@ -23,9 +23,6 @@ type Connection struct {
 
 type Config map[string]interface{}
 
-func (c Config) Enable() bool {
-	return c["enable"].(bool)
-}
 func (c Config) Path() string {
 	return c["path"].(string)
 }
@@ -34,12 +31,9 @@ func init() {
 	database.RegisterAdapter("logging", Connect)
 }
 
-func Connect(configuration interface{}) (database.Connection, error) {
+func Connect(configuration map[string]interface{}) (database.Connection, error) {
 	var config Config
-	config = configuration.(map[string]interface{})
-	if !config.Enable() {
-		return nil, nil
-	}
+	config = configuration
 
 	file, err := os.OpenFile(config.Path(), os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600)
 	if err != nil {
diff --git a/database/logging/file_test.go b/database/logging/file_test.go
index 2b43acc..13c0408 100644
--- a/database/logging/file_test.go
+++ b/database/logging/file_test.go
@@ -1 +1,60 @@
 package logging
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/FreifunkBremen/yanic/data"
+	"github.com/FreifunkBremen/yanic/runtime"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestStart(t *testing.T) {
+	assert := assert.New(t)
+
+	conn, err := Connect(map[string]interface{}{
+		"path": "/dev/notexists/file",
+	})
+	assert.Nil(conn)
+	assert.Error(err)
+
+	path := "/tmp/testlogfile"
+
+	conn, err = Connect(map[string]interface{}{
+		"path": path,
+	})
+
+	dat, _ := ioutil.ReadFile(path)
+	assert.NotContains(string(dat), "InsertNode")
+
+	conn.InsertNode(&runtime.Node{
+		Statistics: &data.Statistics{},
+	})
+
+	dat, _ = ioutil.ReadFile(path)
+	assert.Contains(string(dat), "InsertNode")
+
+	assert.NotContains(string(dat), "InsertLink")
+	conn.InsertLink(&runtime.Link{}, time.Now())
+	dat, _ = ioutil.ReadFile(path)
+	assert.Contains(string(dat), "InsertLink")
+
+	assert.NotContains(string(dat), "InsertGlobals")
+	conn.InsertGlobals(&runtime.GlobalStats{}, time.Now(), runtime.GLOBAL_SITE)
+	dat, _ = ioutil.ReadFile(path)
+	assert.Contains(string(dat), "InsertGlobals")
+
+	assert.NotContains(string(dat), "PruneNodes")
+	conn.PruneNodes(time.Second)
+	dat, _ = ioutil.ReadFile(path)
+	assert.Contains(string(dat), "PruneNodes")
+
+	assert.NotContains(string(dat), "Close")
+	conn.Close()
+	dat, _ = ioutil.ReadFile(path)
+	assert.Contains(string(dat), "Close")
+
+	os.Remove(path)
+}
diff --git a/output/meshviewer-ffrgb/meshviewer_test.go b/output/meshviewer-ffrgb/meshviewer_test.go
index 72866c5..efd622a 100644
--- a/output/meshviewer-ffrgb/meshviewer_test.go
+++ b/output/meshviewer-ffrgb/meshviewer_test.go
@@ -172,12 +172,14 @@ func TestTransform(t *testing.T) {
 			assert.Equal("node:b:mac:wifi", link.TargetMAC)
 			assert.Equal(float32(0.6), link.SourceTQ)
 			assert.Equal(float32(0.8), link.TargetTQ)
-		default:
+		case "node:b:mac:lan":
 			assert.Equal("other", link.Type)
 			assert.Equal("node:c:mac:lan", link.TargetMAC)
 			assert.Equal(float32(0.8), link.SourceTQ)
 			assert.Equal(float32(0.4), link.TargetTQ)
 			break
+		default:
+			assert.False(true, "invalid link.SourceMAC found")
 		}
 	}
 }
diff --git a/runtime/config.go b/runtime/config.go
index 23e9325..d4578a2 100644
--- a/runtime/config.go
+++ b/runtime/config.go
@@ -37,7 +37,7 @@ type Config struct {
 	Database struct {
 		DeleteInterval Duration `toml:"delete_interval"` // Delete stats of nodes every n minutes
 		DeleteAfter    Duration `toml:"delete_after"`    // Delete stats of nodes till now-deletetill n minutes
-		Connection     map[string][]interface{}
+		Connection     map[string]interface{}
 	}
 }
 
diff --git a/runtime/config_test.go b/runtime/config_test.go
index 434e175..ae6269d 100644
--- a/runtime/config_test.go
+++ b/runtime/config_test.go
@@ -31,15 +31,15 @@ func TestReadConfig(t *testing.T) {
 	assert.Equal("/var/www/html/meshviewer/data/nodes.json", meshviewer["nodes_path"])
 
 	var influxdb map[string]interface{}
-	dbs := config.Database.Connection["influxdb"]
+	dbs := config.Database.Connection["influxdb"].([]map[string]interface{})
 	assert.Len(dbs, 1, "more influxdb are given")
-	influxdb = dbs[0].(map[string]interface{})
+	influxdb = dbs[0]
 	assert.Equal(influxdb["database"], "ffhb")
 
 	var graphitedb map[string]interface{}
-	dbs = config.Database.Connection["graphite"]
+	dbs = config.Database.Connection["graphite"].([]map[string]interface{})
 	assert.Len(dbs, 1, "more graphitedb are given")
-	graphitedb = dbs[0].(map[string]interface{})
+	graphitedb = dbs[0]
 	assert.Equal(graphitedb["address"], "localhost:2003")
 
 	_, err = ReadConfigFile("testdata/config_failed.toml")