diff --git a/hdlc/client.c b/hdlc/client.c
index 62a53b9..a4307af 100644
--- a/hdlc/client.c
+++ b/hdlc/client.c
@@ -2,7 +2,6 @@
 
 #include <stdio.h>
 #include <fcntl.h>
-#include <unistd.h>
 
 void init_Client(Client* client, bool test_is_valid, uint8_t address, void* serial_port) {
     client->TEST_IS_VALID = test_is_valid;
@@ -22,24 +21,21 @@ void connect(Client* client) {
     create_frame(&u_frame.base, result);
 
     void* serial_port = client->serial_port;
-    // Write result to serial port to establish connection
-    // ...
-
+    sendSerialData(serial_port, u_frame.base.data, u_frame.base.data_length);
     // Wait for acknowledgment frame
-    // Read bytes from serial port
-    // ...
+    bool flag = true;
+    uint8_t  data[u_frame.base.data_length];
+    while(flag){
+        int bytes_received = receiveSerialData(serial_port, data, 256);
+        if (bytes_received > 0){
+            flag = false;
+        }
+    }
 
-    uint8_t received[256]; // Example buffer size, adjust as needed
-    size_t received_length = 0;
-
-    // Process received bytes
-    // ...
-
-    // Validate acknowledgment frame
     HDLCFrame frame;
-    init_HDLCFrame(&frame, 0, 0, received + 3, received_length - 6);
-    if (validate(client, &frame, received, received_length)) {
-        // Connection established
+    init_HDLCFrame(&frame, 0, 0, data + 3, 256 - 6);
+    if (validate(client, &frame, data, 256)) {
+        return;
     } else {
         // Connection failed
     }
@@ -54,19 +50,20 @@ void send(Client* client, uint8_t* data, size_t data_length) {
     uint8_t result[256];
     create_frame(&i_frame.base, result);
 
-    void* serial_port = client->serial_port;
-    sendSerialData(client->serial_port, &i_frame.base.data, i_frame.base.data_length);
+    sendSerialData(client->serial_port, i_frame.base.data, i_frame.base.data_length);
 
     client->_send_sequence_number++;
 }
 
-void receive_data(Client* client) {
+void receive_data(Client* client, uint8_t* recivedData, int lenRecived) {
     void* serial_port = client->serial_port;
-    // Read data from serial port
-    // ...
-
-    // Process received data
-    // ...
+    bool flag = true;
+    while(flag){
+        int bytes_received = receiveSerialData(serial_port, recivedData, lenRecived);
+        if (bytes_received > 0){
+            flag = false;
+        }
+    }
 }
 
 bool validate(Client* client, HDLCFrame* frame, uint8_t* received_data, size_t received_length) {
@@ -93,7 +90,7 @@ bool validate(Client* client, HDLCFrame* frame, uint8_t* received_data, size_t r
     return false;
 }
 
-int sendSerialData(const char* port, const char* data, size_t length) {
+int sendSerialData(const char* port, uint8_t* data, size_t length) {
     int serial_port = open(port, O_RDWR); // Replace "port" with your serial port device
 
     if (serial_port < 0) {
@@ -110,4 +107,23 @@ int sendSerialData(const char* port, const char* data, size_t length) {
 
     close(serial_port);
     return bytes_written;
+}
+
+int receiveSerialData(const char* port, uint8_t* data, int length) {
+    int serial_port = open(port, O_RDWR); // Replace "port" with your serial port device
+
+    if (serial_port < 0) {
+        perror("Error opening the serial port");
+        return -1;
+    }
+
+    ssize_t bytes_read = read(serial_port, data, length);
+
+    if (bytes_read < 0) {
+        perror("Error reading from the serial port");
+        return -1;
+    }
+
+    close(serial_port);
+    return bytes_read;
 }
\ No newline at end of file
diff --git a/hdlc/client.h b/hdlc/client.h
index 6b48c0a..ca306cb 100644
--- a/hdlc/client.h
+++ b/hdlc/client.h
@@ -22,8 +22,9 @@ typedef struct {
 void init_Client(Client* client, bool test_is_valid, uint8_t address, void* serial_port);
 void connect(Client* client);
 void send(Client* client, uint8_t* data, size_t data_length);
-void receive_data(Client* client);
+void receive_data(Client* client, uint8_t* recivedData, int lenRecived);
 bool validate(Client* client, HDLCFrame* frame, uint8_t* received_data, size_t received_length);
-int sendSerialData(const char* port, const char* data, size_t length);
+int sendSerialData(const char* port, uint8_t* data, size_t length);
+int receiveSerialData(const char* port, uint8_t* data, int length);
 
 #endif