diff --git a/client.go b/client.go
index cc152f3..4d7857e 100644
--- a/client.go
+++ b/client.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/xml"
 	"errors"
-	"fmt"
 	"io"
 	"net"
 	"time"
@@ -60,21 +59,21 @@ type EventManager struct {
 	Handler EventHandler
 }
 
-func (em EventManager) updateState(state ConnState) {
+func (em *EventManager) updateState(state ConnState) {
 	em.CurrentState = state
 	if em.Handler != nil {
 		em.Handler(Event{State: em.CurrentState})
 	}
 }
 
-func (em EventManager) disconnected(state SMState) {
+func (em *EventManager) disconnected(state SMState) {
 	em.CurrentState = StateDisconnected
 	if em.Handler != nil {
 		em.Handler(Event{State: em.CurrentState, SMState: state})
 	}
 }
 
-func (em EventManager) streamError(error, desc string) {
+func (em *EventManager) streamError(error, desc string) {
 	em.CurrentState = StateStreamError
 	if em.Handler != nil {
 		em.Handler(Event{State: em.CurrentState, StreamError: error, Description: desc})
@@ -110,6 +109,9 @@ Setting up the client / Checking the parameters
 // If host is not specified, the DNS SRV should be used to find the host from the domainpart of the JID.
 // Default the port to 5222.
 func NewClient(config Config, r *Router, errorHandler func(error)) (c *Client, err error) {
+	if config.KeepaliveInterval == 0 {
+		config.KeepaliveInterval = time.Second * 30
+	}
 	// Parse JID
 	if config.parsedJid, err = NewJid(config.Jid); err != nil {
 		err = errors.New("missing jid")
@@ -188,7 +190,7 @@ func (c *Client) Resume(state SMState) error {
 
 	// Start the keepalive go routine
 	keepaliveQuit := make(chan struct{})
-	go keepalive(c, keepaliveQuit)
+	go keepalive(c.transport, c.config.KeepaliveInterval, keepaliveQuit)
 	// Start the receiver go routine
 	state = c.Session.SMState
 	go c.recv(state, keepaliveQuit)
@@ -197,7 +199,7 @@ func (c *Client) Resume(state SMState) error {
 	//fmt.Fprintf(client.conn, "<presence xml:lang='en'><show>%s</show><status>%s</status></presence>", "chat", "Online")
 	// TODO: Do we always want to send initial presence automatically ?
 	// Do we need an option to avoid that or do we rely on client to send the presence itself ?
-	_, err = fmt.Fprintf(c.transport, "<presence/>")
+	err = c.sendWithWriter(c.transport, []byte("<presence/>"))
 
 	return err
 }
@@ -312,10 +314,8 @@ func (c *Client) recv(state SMState, keepaliveQuit chan<- struct{}) {
 // Loop: send whitespace keepalive to server
 // This is use to keep the connection open, but also to detect connection loss
 // and trigger proper client connection shutdown.
-func keepalive(c *Client, quit <-chan struct{}) {
-	// TODO: Make keepalive interval configurable
-	transport := c.transport
-	ticker := time.NewTicker(30 * time.Second)
+func keepalive(transport Transport, interval time.Duration, quit <-chan struct{}) {
+	ticker := time.NewTicker(interval)
 	for {
 		select {
 		case <-ticker.C:
diff --git a/client_test.go b/client_test.go
index 15e104f..0caace0 100644
--- a/client_test.go
+++ b/client_test.go
@@ -19,6 +19,24 @@ const (
 	testClientDomain = "localhost"
 )
 
+func TestEventManager(t *testing.T) {
+	mgr := EventManager{}
+	mgr.updateState(StateConnected)
+	if mgr.CurrentState != StateConnected {
+		t.Fatal("CurrentState not updated by updateState()")
+	}
+
+	mgr.disconnected(SMState{})
+	if mgr.CurrentState != StateDisconnected {
+		t.Fatalf("CurrentState not reset by disconnected()")
+	}
+
+	mgr.streamError(ErrTLSNotSupported.Error(), "")
+	if mgr.CurrentState != StateStreamError {
+		t.Fatalf("CurrentState not set by streamError()")
+	}
+}
+
 func TestClient_Connect(t *testing.T) {
 	// Setup Mock server
 	mock := ServerMock{}
diff --git a/component.go b/component.go
index 2f61aef..8b96240 100644
--- a/component.go
+++ b/component.go
@@ -85,7 +85,7 @@ func (c *Component) Resume(sm SMState) error {
 	c.updateState(StateConnected)
 
 	// Authentication
-	if _, err := fmt.Fprintf(c.transport, "<handshake>%s</handshake>", c.handshake(streamId)); err != nil {
+	if err := c.sendWithWriter(c.transport, []byte(fmt.Sprintf("<handshake>%s</handshake>", c.handshake(streamId)))); err != nil {
 		c.updateState(StateStreamError)
 
 		return NewConnError(errors.New("cannot send handshake "+err.Error()), false)
@@ -159,12 +159,18 @@ func (c *Component) Send(packet stanza.Packet) error {
 		return errors.New("cannot marshal packet " + err.Error())
 	}
 
-	if _, err := fmt.Fprintf(transport, string(data)); err != nil {
+	if err := c.sendWithWriter(transport, data); err != nil {
 		return errors.New("cannot send packet " + err.Error())
 	}
 	return nil
 }
 
+func (c *Component) sendWithWriter(writer io.Writer, packet []byte) error {
+	var err error
+	_, err = writer.Write(packet)
+	return err
+}
+
 // SendIQ sends an IQ set or get stanza to the server. If a result is received
 // the provided handler function will automatically be called.
 //
@@ -195,7 +201,7 @@ func (c *Component) SendRaw(packet string) error {
 	}
 
 	var err error
-	_, err = fmt.Fprintf(transport, packet)
+	err = c.sendWithWriter(transport, []byte(packet))
 	return err
 }
 
diff --git a/config.go b/config.go
index e3ea108..da4d4ab 100644
--- a/config.go
+++ b/config.go
@@ -2,6 +2,7 @@ package xmpp
 
 import (
 	"os"
+	"time"
 )
 
 // Config & TransportConfiguration must not be modified after having been passed to NewClient. Any
@@ -9,12 +10,13 @@ import (
 type Config struct {
 	TransportConfiguration
 
-	Jid            string
-	parsedJid      *Jid // For easier manipulation
-	Credential     Credential
-	StreamLogger   *os.File // Used for debugging
-	Lang           string   // TODO: should default to 'en'
-	ConnectTimeout int      // Client timeout in seconds. Default to 15
+	Jid               string
+	parsedJid         *Jid // For easier manipulation
+	Credential        Credential
+	StreamLogger      *os.File      // Used for debugging
+	Lang              string        // TODO: should default to 'en'
+	KeepaliveInterval time.Duration // Interval between keepalive packets
+	ConnectTimeout    int           // Client timeout in seconds. Default to 15
 	// Insecure can be set to true to allow to open a session without TLS. If TLS
 	// is supported on the server, we will still try to use it.
 	Insecure bool
diff --git a/tcp_server_mock.go b/tcp_server_mock.go
index 4afed80..efdda23 100644
--- a/tcp_server_mock.go
+++ b/tcp_server_mock.go
@@ -117,21 +117,25 @@ func (mock *ServerMock) loop() {
 //======================================================================================================================
 
 func respondToIQ(t *testing.T, c net.Conn) {
-	// Decoder to parse the request
-	decoder := xml.NewDecoder(c)
-
-	iqReq, err := receiveIq(c, decoder)
+	recvBuf := make([]byte, 1024)
+	var iqR stanza.IQ
+	_, err := c.Read(recvBuf[:]) // recv data
 	if err != nil {
-		t.Fatalf("failed to receive IQ : %s", err.Error())
+		if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
+			t.Errorf("read timeout: %s", err)
+		} else {
+			t.Errorf("read error: %s", err)
+		}
 	}
+	xml.Unmarshal(recvBuf, &iqR)
 
-	if !iqReq.IsValid() {
+	if !iqR.IsValid() {
 		mockIQError(c)
 		return
 	}
 
 	// Crafting response
-	iqResp := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeResult, From: iqReq.To, To: iqReq.From, Id: iqReq.Id, Lang: "en"})
+	iqResp := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeResult, From: iqR.To, To: iqR.From, Id: iqR.Id, Lang: "en"})
 	disco := iqResp.DiscoInfo()
 	disco.AddFeatures("vcard-temp",
 		`http://jabber.org/protocol/address`)