diff --git a/cmd/main.go b/cmd/main.go
index f1942eb..770cff3 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -55,6 +55,14 @@ func main() {
 	eraseErrorRule := writers.CreateEraseErrorRule("^ERASE_ERROR\r\n$")
 	protocolRepository.AddWriter(&eraseErrorRule)
 
+	// Creation of the EraseOkRule
+	retrieveOkRule := writers.CreateRetrieveOkRule("^RETRIEVE_OK ([A-Za-z0-9.]{50,200} [0-9]{1,10} [A-Za-z0-9.]{50,200})\r\n$", appConfig.StoragePath)
+	protocolRepository.AddWriter(&retrieveOkRule)
+
+	// Creation of the EraseErrorRule
+	retrieveErrorRule := writers.CreateRetrieveErrorRule("^RETRIEVE_ERROR\r\n$")
+	protocolRepository.AddWriter(&retrieveErrorRule)
+
 	/**
 	===== Init all Reader here =====
 	*/
@@ -62,10 +70,14 @@ func main() {
 	eraseFileRule := readers.CreateEraseFileRule("^ERASEFILE ([A-Za-z0-9.]{50,200})\r\n$", protocolRepository, appConfig.StoragePath)
 	protocolRepository.AddReader(&eraseFileRule)
 
-	// Creation of the SendFileRule // TODO reset to 50,200
-	sendFileRule := readers.CreateSendFileRule("^SENDFILE ([A-Za-z0-9.]{1,200}) ([0-9]{1,10}) ([A-Za-z0-9.]{50,200})\r\n$", protocolRepository, appConfig.StoragePath)
+	// Creation of the SendFileRule
+	sendFileRule := readers.CreateSendFileRule("^SENDFILE ([A-Za-z0-9.]{50,200}) ([0-9]{1,10}) ([A-Za-z0-9.]{50,200})\r\n$", protocolRepository, appConfig.StoragePath)
 	protocolRepository.AddReader(&sendFileRule)
 
+	// Create of the RetrieveFileRule
+	retrieveFileRule := readers.CreateRetrieveFileRule("^RETRIEVEFILE ([A-Za-z0-9.]{50,200})\r\n$", protocolRepository, appConfig.StoragePath)
+	protocolRepository.AddReader(&retrieveFileRule)
+
 	// Create a Multicast Client & run it
 	multicast := network.CreateClientMulticast(
 		appConfig.MulticastNetworkInterface, appConfig.MulticastAddress, appConfig.Domain,
diff --git a/pkg/network/ClientMulticast.go b/pkg/network/ClientMulticast.go
index 49f97c6..5e96aa3 100644
--- a/pkg/network/ClientMulticast.go
+++ b/pkg/network/ClientMulticast.go
@@ -3,6 +3,7 @@ package network
 import (
 	"StoreBackEnd/pkg/protocol/repository"
 	"StoreBackEnd/pkg/protocol/rules/writers"
+	"StoreBackEnd/pkg/utils"
 	"fmt"
 	"net"
 	"time"
@@ -48,6 +49,7 @@ func (client ClientMulticast) Run() {
 	// Resolve interface addr
 	lAddr, failedRIA := ResolveInterfaceAddr(client.netInter)
 	if failedRIA {
+		println("Error : No IPv4 found in interface")
 		return
 	}
 
@@ -81,21 +83,18 @@ func (client ClientMulticast) ResolveAddr() (*net.UDPAddr, bool) {
 
 // ResolveInterfaceAddr Resolves the network interface address.
 func ResolveInterfaceAddr(inter string) (*net.UDPAddr, bool) {
-	//ief, _ := net.InterfaceByName(inter)
-	//addrs, _ := ief.Addrs()
-	//for _, addr := range addrs {
-	//	if utils.IsIPv4(addr.String()) {
-	//		println("Selected IP", addr.String())
-	//		lAddr, _ := net.ResolveUDPAddr("udp", "127.0.0.1:15502")
-	//		return lAddr, false
-	//	}
-	//}
-	return nil, false
+	ip, err := utils.RetrieveIPv4FromInterface(inter)
+	if err != nil {
+		println("Error while loading interface : " + err.Error())
+		return nil, true
+	}
+	println("Selected IP for multicast : " + ip.String())
+	return &net.UDPAddr{IP: ip}, false
 }
 
 // DialUdp Ouvre une connection UDP
 func (client ClientMulticast) DialUdp(lAddr *net.UDPAddr, rAddr *net.UDPAddr) (*net.UDPConn, bool) {
-	con, errDial := net.DialUDP("udp", nil, rAddr)
+	con, errDial := net.DialUDP("udp", lAddr, rAddr)
 	if errDial != nil {
 		println(errDial.Error())
 		return nil, true
diff --git a/pkg/protocol/rules/readers/RetrieveFileRule.go b/pkg/protocol/rules/readers/RetrieveFileRule.go
new file mode 100644
index 0000000..6b080f9
--- /dev/null
+++ b/pkg/protocol/rules/readers/RetrieveFileRule.go
@@ -0,0 +1,60 @@
+package readers
+
+import (
+	"StoreBackEnd/pkg/protocol"
+	"StoreBackEnd/pkg/protocol/repository"
+	"StoreBackEnd/pkg/protocol/rules/writers"
+	"StoreBackEnd/pkg/utils"
+	"bufio"
+	"fmt"
+	"os"
+)
+
+// RetrieveFileRulePrefix Identifiant de cette règle
+const RetrieveFileRulePrefix = "RETRIEVEFILE"
+
+// RetrieveFileRule Demande de suppression d'un fichier
+type RetrieveFileRule struct {
+	// Cmd Nom de la règle
+	Cmd string
+	// matcher Permet de vérifier le matching
+	matcher *protocol.RegexMatcher
+	// protocolRepo Instance de ProtocolRepository
+	protocolRepo *repository.ProtocolRepository
+	// storagePath Chemin de stockage du fichier
+	storagePath string
+}
+
+// CreateRetrieveFileRule Création d'une instance de RetrieveFileRule
+func CreateRetrieveFileRule(pattern string, protocolRepo *repository.ProtocolRepository, storagePath string) protocol.IProtocolReader {
+	return &RetrieveFileRule{
+		Cmd:          RetrieveFileRulePrefix,
+		matcher:      protocol.CreateRegexMatcher(pattern),
+		protocolRepo: protocolRepo,
+		storagePath:  storagePath,
+	}
+}
+
+func (rule RetrieveFileRule) GetCmd() string {
+	return rule.Cmd
+}
+
+func (rule RetrieveFileRule) Execute(data string) (*protocol.ProtocolWriterResult, func(reader *bufio.Reader) *protocol.ProtocolWriterResult) {
+
+	if rule.Match(data) {
+		values := rule.matcher.Parse(data)
+		hashFileName := values[1]
+
+		path := fmt.Sprintf("%s/%s", rule.storagePath, hashFileName)
+		if fileinfo, err := os.Stat(path); err == nil {
+			println("OKOKOKOEKOEKE : ", hashFileName, fmt.Sprintf("%d", fileinfo.Size()), fmt.Sprintf("%x", utils.GenFingerPrint(path)))
+
+			return rule.protocolRepo.ExecuteWriter(writers.RetrieveOkRulePrefix, hashFileName, fmt.Sprintf("%d", fileinfo.Size()), fmt.Sprintf("%x", utils.GenFingerPrint(path))), nil
+		}
+	}
+	return rule.protocolRepo.ExecuteWriter(writers.RetrieveErrorRulePrefix), nil
+}
+
+func (rule RetrieveFileRule) Match(data string) bool {
+	return rule.matcher.Match(data)
+}
diff --git a/pkg/protocol/rules/readers/SendFileRule.go b/pkg/protocol/rules/readers/SendFileRule.go
index cd0d849..7e8f21d 100644
--- a/pkg/protocol/rules/readers/SendFileRule.go
+++ b/pkg/protocol/rules/readers/SendFileRule.go
@@ -12,7 +12,7 @@ import (
 )
 
 // SendFileRulePrefix Rule command prefix
-const SendFileRulePrefix = "ffe_sendfile"
+const SendFileRulePrefix = "SENDFILE"
 
 // SendFileRule Storage structure for the SendFileRule
 type SendFileRule struct {
diff --git a/pkg/protocol/rules/writers/RetrieveErrorRule.go b/pkg/protocol/rules/writers/RetrieveErrorRule.go
new file mode 100644
index 0000000..27edeb0
--- /dev/null
+++ b/pkg/protocol/rules/writers/RetrieveErrorRule.go
@@ -0,0 +1,38 @@
+package writers
+
+import (
+	"StoreBackEnd/pkg/protocol"
+)
+
+// RetrieveErrorRulePrefix Rule command prefix
+const RetrieveErrorRulePrefix = "RETRIEVE_ERROR"
+
+// RetrieveErrorRule Storage structure for the RetrieveErrorRule
+type RetrieveErrorRule struct {
+	// cmd Rule name
+	cmd string
+	// matcher Allow to make a regex match
+	matcher *protocol.RegexMatcher
+}
+
+// CreateRetrieveErrorRule Creating an instance of RetrieveErrorRule
+func CreateRetrieveErrorRule(pattern string) protocol.IProtocolWriter {
+	return &RetrieveErrorRule{
+		cmd:     RetrieveErrorRulePrefix,
+		matcher: protocol.CreateRegexMatcher(pattern),
+	}
+}
+
+// GetCmd retrieve the command name.
+func (rule RetrieveErrorRule) GetCmd() string {
+	return rule.cmd
+}
+
+// Execute the Rule with a string command.
+func (rule RetrieveErrorRule) Execute(argsData ...string) *protocol.ProtocolWriterResult {
+	buildedCmd, _ := rule.matcher.Build(RetrieveErrorRulePrefix, argsData...)
+
+	return &protocol.ProtocolWriterResult{
+		Cmd: buildedCmd,
+	}
+}
diff --git a/pkg/protocol/rules/writers/RetrieveOkRule.go b/pkg/protocol/rules/writers/RetrieveOkRule.go
new file mode 100644
index 0000000..0270fe7
--- /dev/null
+++ b/pkg/protocol/rules/writers/RetrieveOkRule.go
@@ -0,0 +1,58 @@
+package writers
+
+import (
+	"StoreBackEnd/pkg/protocol"
+	"StoreBackEnd/pkg/utils"
+	"bufio"
+	"fmt"
+	"strconv"
+)
+
+// RetrieveOkRulePrefix Rule command prefix
+const RetrieveOkRulePrefix = "RETRIEVE_OK"
+
+// RetrieveOkRule Storage structure for the RetrieveOkRule
+type RetrieveOkRule struct {
+	// cmd Rule name
+	cmd string
+	// matcher Allow to make a regex match
+	matcher *protocol.RegexMatcher
+	// storagePath Chemin de stockage du fichier
+	storagePath string
+}
+
+// CreateRetrieveOkRule Creating an instance of RetrieveOkRule
+func CreateRetrieveOkRule(pattern string, storagePath string) protocol.IProtocolWriter {
+	return &RetrieveOkRule{
+		cmd:         RetrieveOkRulePrefix,
+		matcher:     protocol.CreateRegexMatcher(pattern),
+		storagePath: storagePath,
+	}
+}
+
+// GetCmd retrieve the command name.
+func (rule RetrieveOkRule) GetCmd() string {
+	return rule.cmd
+}
+
+// Execute the Rule with a string command.
+func (rule RetrieveOkRule) Execute(argsData ...string) *protocol.ProtocolWriterResult {
+	buildedCmd, _ := rule.matcher.Build(RetrieveOkRulePrefix, argsData...)
+
+	return &protocol.ProtocolWriterResult{
+		Cmd: buildedCmd,
+		Write: func(writer *bufio.Writer) {
+			fileSize, _ := strconv.Atoi(argsData[1])
+			rule.onWrite(writer, argsData[0], fileSize)
+		},
+	}
+}
+
+func (rule RetrieveOkRule) onWrite(writer *bufio.Writer, hashFileName string, fileSize int) {
+	path := fmt.Sprintf("%s/%s", rule.storagePath, hashFileName)
+	if utils.SendFile(path, fileSize, writer) {
+		println("Fichier envoyé au client")
+	} else {
+		println("Fichier non-envoyé au client")
+	}
+}
diff --git a/pkg/utils/FileReceiver.go b/pkg/utils/FileReceiver.go
index fc4e075..aaac2fe 100644
--- a/pkg/utils/FileReceiver.go
+++ b/pkg/utils/FileReceiver.go
@@ -44,11 +44,3 @@ func copyFile(currentSize int, fileSize int, reader *bufio.Reader, buffer []byte
 	}
 	return false, false
 }
-
-func fileExists(filename string) bool {
-	info, err := os.Stat(filename)
-	if os.IsNotExist(err) {
-		return false
-	}
-	return !info.IsDir()
-}
diff --git a/pkg/utils/FileSender.go b/pkg/utils/FileSender.go
index fe33016..2609c91 100644
--- a/pkg/utils/FileSender.go
+++ b/pkg/utils/FileSender.go
@@ -8,9 +8,9 @@ import (
 )
 
 // SendFile Envoie d'un fichier local sur le réseau
-func SendFile(fileName string, fileSize int, writer *bufio.Writer) bool {
+func SendFile(filePath string, fileSize int, writer *bufio.Writer) bool {
 	// Ouverture du fichier
-	file, fileErr := os.Open(fmt.Sprintf("/home/benjamin/sbe/%s", fileName))
+	file, fileErr := os.Open(fmt.Sprintf("%s", filePath))
 	if fileErr != nil {
 		return false
 	}
@@ -25,5 +25,5 @@ func SendFile(fileName string, fileSize int, writer *bufio.Writer) bool {
 		return false
 	}
 
-	return false
+	return true
 }
diff --git a/pkg/utils/Hasher.go b/pkg/utils/Hasher.go
index 3178285..36e03b2 100644
--- a/pkg/utils/Hasher.go
+++ b/pkg/utils/Hasher.go
@@ -10,6 +10,12 @@ import (
 )
 
 func HashFileCompare(path string, fingerPrint string) bool {
+	sum := GenFingerPrint(path)
+
+	return fingerPrint == fmt.Sprintf("%x", sum)
+}
+
+func GenFingerPrint(path string) []byte {
 	f, err := os.Open(path)
 	if err != nil {
 		log.Fatal(err)
@@ -24,8 +30,5 @@ func HashFileCompare(path string, fingerPrint string) bool {
 	}
 	sum := hash.Sum(nil)
 
-	fmt.Printf("%x\n", sum)
-
-	println(fingerPrint, fmt.Sprintf("%x", sum))
-	return fingerPrint == fmt.Sprintf("%x", sum)
+	return sum
 }
diff --git a/pkg/utils/Network.go b/pkg/utils/Network.go
index 607d42c..a8ceddc 100644
--- a/pkg/utils/Network.go
+++ b/pkg/utils/Network.go
@@ -1,6 +1,7 @@
 package utils
 
 import (
+	"errors"
 	"fmt"
 	"net"
 	"strings"
@@ -29,6 +30,26 @@ func NetworkLister() {
 	print("\n")
 }
 
+// RetrieveIPv4FromInterface Retrieve the first IPv4 from an interface.
+func RetrieveIPv4FromInterface(inter string) (net.IP, error) {
+	ief, err := net.InterfaceByName(inter)
+	addrs, err := ief.Addrs()
+	if err != nil {
+		return nil, err
+	}
+	for _, addr := range addrs {
+		switch v := addr.(type) {
+		case *net.IPNet:
+			//if !v.IP.IsLoopback() {
+			if v.IP.To4() != nil { //Verify if IP is IPV4
+				return v.IP, nil
+			}
+			//}
+		}
+	}
+	return nil, errors.New("no IPv4 found")
+}
+
 // IsIPv4 Check if the ip is a v4 or v6 ip
 func IsIPv4(addr string) bool {
 	return strings.Count(addr, ":") < 2
diff --git a/resources/AppConfig.json b/resources/AppConfig.json
index 38b0daf..7d5b169 100644
--- a/resources/AppConfig.json
+++ b/resources/AppConfig.json
@@ -1,8 +1,8 @@
 {
-  "multicastNetworkInterface": "Wi-Fi",
-  "multicastAddress": "224.66.66.1:15502",
-  "multicastSecond": 30,
-  "domain": "lightcontainerSB01",
-  "unicastPort": 58000,
-  "storagePath": "/home/benjamin/sbe"
+  "multicastNetworkInterface" : "Loopback Pseudo-Interface 1",
+  "multicastAddress" : "224.66.66.1:15502",
+  "multicastSecond" : 30,
+  "domain" : "lightcontainerSB01",
+  "unicastPort" : 58000,
+  "storagePath" : "D:\\sbe"
 }
\ No newline at end of file