diff --git a/.gitignore b/.gitignore
index 6fec756..86c4844 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
+# VScode
+.vscode/
+
 # CMake
 .cache/
 build/
diff --git a/src/libmqttd/network/connection/connect_ack.cpp b/src/libmqttd/network/connection/connect_ack.cpp
index 3a72d27..6ab0f04 100644
--- a/src/libmqttd/network/connection/connect_ack.cpp
+++ b/src/libmqttd/network/connection/connect_ack.cpp
@@ -1,32 +1,36 @@
-#include "packet_interface.hpp"
 #include "fixed_header.hpp"
+#include "packet_interface.hpp"
+#include "property.hpp"
 #include <connect_ack.hpp>
 #include <cstddef>
 #include <vector>
 
-
-ConnectACK::ConnectACK() : PacketInterface(){
+ConnectACK::ConnectACK() : PacketInterface() {
   PacketInterface::fixed_header.packet_type = PacketType::CONNACK;
   PacketInterface::fixed_header.packet_flags = 0;
+  // There is a obrigatory reason code and connect acknowledge flags after fixed header, thus we are garanteed to have at least 2 bytes
+  PacketInterface::fixed_header.remaining_length = 2;
 };
 
-void set_properties(const MQTTProperties &value) {
-
+void ConnectACK::add_property(const PropertyIdentifier &prop, const PropertyValue &value) { 
+  this->properties[prop] = value; 
 }
 
-std::vector<std::byte> ConnectACK::as_bytes() const {
-  std::vector<std::byte> byte_vector;
-  byte_vector = PacketInterface::as_bytes();
-  
-  if(session_present)
-    byte_vector.push_back(std::byte(1));
+std::vector<std::byte> ConnectACK::as_bytes() {
+  std::vector<std::byte> variable_header_bytes;
+  if (session_present)
+    variable_header_bytes.emplace_back(std::byte(1));
   else
-    byte_vector.push_back(std::byte(0));
-  
-  byte_vector.push_back(std::byte(reason_code));
+    variable_header_bytes.emplace_back(std::byte(0));
+
+  variable_header_bytes.emplace_back(std::byte(reason_code));
 
   std::vector<std::byte> properties_bytes = properties.as_bytes();
-  byte_vector.insert(byte_vector.end(), properties_bytes.begin(), properties_bytes.end());
+  variable_header_bytes.insert(variable_header_bytes.end(), properties_bytes.begin(), properties_bytes.end());
 
-  return byte_vector;
+  PacketInterface::fixed_header.remaining_length = variable_header_bytes.size();
+
+  std::vector<std::byte> fixed_header_bytes = PacketInterface::as_bytes();
+  fixed_header_bytes.insert(fixed_header_bytes.end(), variable_header_bytes.begin(), variable_header_bytes.end());
+  return fixed_header_bytes;
 }
diff --git a/src/libmqttd/network/connection/connect_ack.hpp b/src/libmqttd/network/connection/connect_ack.hpp
index 3c29fe7..19e1ee6 100644
--- a/src/libmqttd/network/connection/connect_ack.hpp
+++ b/src/libmqttd/network/connection/connect_ack.hpp
@@ -36,8 +36,8 @@ public:
   
   void set_session_present(const bool &value) { this->session_present = value; };
   void set_reason_code(const ConnectReasonCode &value) { this->reason_code = value; };
-  void set_properties(const MQTTProperties &value);
-  std::vector<std::byte> as_bytes() const;
+  void add_property(const PropertyIdentifier&, const PropertyValue&);
+  std::vector<std::byte> as_bytes();
 
 private:
   //Variable Header
diff --git a/src/libmqttd/network/connection/connect_packet.cpp b/src/libmqttd/network/connection/connect_packet.cpp
index 2a8e975..42551f8 100644
--- a/src/libmqttd/network/connection/connect_packet.cpp
+++ b/src/libmqttd/network/connection/connect_packet.cpp
@@ -51,6 +51,7 @@ ConnectionFlagValue ConnectPacket::get_connection_flag(ConnectFlags flag) const
   return static_cast<bool>(utilities::bit::get(connection_flags_value, flag_pos));
 }
 
+
 std::string ConnectPacket::as_string() const {
   std::ostringstream packet_str;
 
diff --git a/src/libmqttd/network/connection/connect_packet.hpp b/src/libmqttd/network/connection/connect_packet.hpp
index 76d2762..9755f0b 100644
--- a/src/libmqttd/network/connection/connect_packet.hpp
+++ b/src/libmqttd/network/connection/connect_packet.hpp
@@ -30,7 +30,7 @@ public:
   ConnectionFlagValue get_connection_flag(ConnectFlags flag) const;
 
   std::string as_string() const final;
-  std::vector<std::byte> as_bytes() const final { throw NotImplemented(); };
+  std::vector<std::byte> as_bytes() final { throw NotImplemented(); };
 
 private:
   void parse_variable_header() final;
diff --git a/src/libmqttd/network/packet_interface/packet_interface.cpp b/src/libmqttd/network/packet_interface/packet_interface.cpp
index 6fef076..0300ab3 100644
--- a/src/libmqttd/network/packet_interface/packet_interface.cpp
+++ b/src/libmqttd/network/packet_interface/packet_interface.cpp
@@ -40,7 +40,7 @@ std::string PacketInterface::as_string() const {
   return packet_str.str();
 }
 
-std::vector<std::byte> PacketInterface::as_bytes() const {
+std::vector<std::byte> PacketInterface::as_bytes() {
     std::vector<std::byte> packet_bytes;
 
     uint8_t flags_value = static_cast<uint8_t>(fixed_header.packet_flags.to_ulong());
@@ -48,7 +48,7 @@ std::vector<std::byte> PacketInterface::as_bytes() const {
     first_byte = static_cast<uint16_t>(fixed_header.packet_type) << 4;  // Shift de 4 bits para deixar espaço para os flags
     first_byte |= flags_value;
 
-    packet_bytes.push_back(static_cast<std::byte>(first_byte));
+    packet_bytes.emplace_back(static_cast<std::byte>(first_byte));
     std::vector<std::byte> remaining_length_bytes = fixed_header.remaining_length.as_bytes();
     packet_bytes.insert(packet_bytes.end(), remaining_length_bytes.begin(), remaining_length_bytes.end());
 
diff --git a/src/libmqttd/network/packet_interface/packet_interface.hpp b/src/libmqttd/network/packet_interface/packet_interface.hpp
index cb6d94d..b95fe12 100644
--- a/src/libmqttd/network/packet_interface/packet_interface.hpp
+++ b/src/libmqttd/network/packet_interface/packet_interface.hpp
@@ -21,7 +21,7 @@ public:
   inline std::bitset<4> get_packet_flags() const { return this->fixed_header.packet_flags; };
 
   virtual std::string as_string() const;
-  virtual std::vector<std::byte> as_bytes() const;
+  virtual std::vector<std::byte> as_bytes();
 
 protected:
   std::vector<std::byte> raw_data;
diff --git a/src/libmqttd/network/packet_interface/property.cpp b/src/libmqttd/network/packet_interface/property.cpp
index 285e3b7..baac653 100644
--- a/src/libmqttd/network/packet_interface/property.cpp
+++ b/src/libmqttd/network/packet_interface/property.cpp
@@ -13,7 +13,10 @@
 #include <type_traits>
 #include <vector>
 
-MQTTProperties::MQTTProperties() { this->properties[PropertyIdentifier::USER_PROPERTY] = UserProperty(); }
+MQTTProperties::MQTTProperties() { 
+  this->properties[PropertyIdentifier::USER_PROPERTY] = UserProperty(); 
+  this->length = 0;
+}
 
 MQTTProperties::MQTTProperties(const std::vector<std::byte>::const_iterator &property_start) {
   this->properties[PropertyIdentifier::USER_PROPERTY] = UserProperty();
@@ -239,6 +242,11 @@ std::vector<std::byte> MQTTProperties::as_bytes() const {
   return properties_bytes;
 }
 
+PropertyValue& MQTTProperties::operator[](PropertyIdentifier prop) {
+  return this->properties[prop];
+  this->length = int(this->length)+ 1;
+}
+
 struct VariantPrinter {
   std::ostream &os;
   template <typename T> void operator()(const T &value) const { os << value; }
diff --git a/src/libmqttd/network/packet_interface/property.hpp b/src/libmqttd/network/packet_interface/property.hpp
index 3854ce6..46a6131 100644
--- a/src/libmqttd/network/packet_interface/property.hpp
+++ b/src/libmqttd/network/packet_interface/property.hpp
@@ -5,6 +5,7 @@
 #include <cstddef>
 #include <cstdint>
 #include <map>
+#include <ostream>
 #include <queue>
 #include <spdlog/spdlog.h>
 #include <types.hpp>
@@ -62,9 +63,10 @@ public:
 
   uint16_t size() const { return this->length; };
   PropertyValue get_property(const PropertyIdentifier &prop) { return this->properties[prop]; };
-  
+
   friend std::ostream &operator<<(std::ostream &os, const std::byte &value);
   friend std::ostream &operator<<(std::ostream &os, const MQTTProperties &value);
+  PropertyValue &operator[](PropertyIdentifier);
 
 private:
   int_vb length;
diff --git a/src/libmqttd/protocol/session.cpp b/src/libmqttd/protocol/session.cpp
index 5ad366d..6942730 100644
--- a/src/libmqttd/protocol/session.cpp
+++ b/src/libmqttd/protocol/session.cpp
@@ -1,7 +1,12 @@
 #include "connect_ack.hpp"
 #include "connect_packet.hpp"
+#include "property.hpp"
+#include "spdlog/spdlog.h"
 #include <cstddef>
+#include <cstdint>
+#include <iostream>
 #include <session.hpp>
+#include <sstream>
 #include <sys/socket.h>
 #include <unistd.h>
 #include <vector>
@@ -34,6 +39,16 @@ void Session::join() {
     this->keepalive_thread.join();
 }
 
+std::size_t Session::send(const std::vector<std::byte> &buffer) {
+  std::ostringstream log_msg;
+  log_msg << "Sending " << buffer.size() << " bytes";
+  spdlog::trace(log_msg.str());
+
+  ::send(this->socket, buffer.data(), buffer.size(), 0);
+
+  return buffer.size();
+}
+
 void Session::listen() {
   std::vector<std::byte> buffer(buffer_size);
 
@@ -41,11 +56,10 @@ void Session::listen() {
     buffer.clear();
     buffer.resize(buffer_size);
 
-    int bytes_received = recv(this->socket, buffer.data(), buffer.size(), 0);
+    std::size_t bytes_received = recv(this->socket, buffer.data(), buffer.size(), 0);
     if (bytes_received < 0) {
       int errno_tmp = errno;
-      spdlog::error("Failed to receive data on socket: " +
-                    std::string(strerror(errno_tmp)));
+      spdlog::error("Failed to receive data on socket: " + std::string(strerror(errno_tmp)));
       return;
     }
 
@@ -53,18 +67,22 @@ void Session::listen() {
     switch (packet.get_packet_type()) {
     case PacketType::CONNECT: {
       ConnectPacket conn_packet(packet);
-      spdlog::trace(conn_packet.as_string());
+      // spdlog::trace(conn_packet.as_string());
 
-      // ConnectACK ack;
-      // ack.set_reason_code(ConnectReasonCode::SUCCESS);
-      // std::vector<std::byte> ack_bytes = ack.as_bytes();
-      // send(this->socket, ack_bytes.data(), ack_bytes.size(), 0);
+      ConnectACK ack;
+      ack.set_reason_code(ConnectReasonCode::SUCCESS);
+      // ack.add_property(PropertyIdentifier::SESSION_EXPIRY_INTERVAL, PropertyValue(uint32_t(60)));
+      // ack.add_property(PropertyIdentifier::RECEIVE_MAXIMUM, PropertyValue(uint16_t(60)));
+      // ack.add_property(PropertyIdentifier::MAXIMUM_QOS, PropertyValue(std::byte(0)));
+      // ack.add_property(PropertyIdentifier::RETAIN_AVAILABLE, PropertyValue(std::byte(0)));
+      // ack.add_property(PropertyIdentifier::MAXIMUM_PACKET_SIZE, PropertyValue(uint32_t(UINT32_MAX)));
 
+      std::vector<std::byte> ack_bytes = ack.as_bytes();
+      this->send(ack_bytes);
       break;
     }
     default: {
-      spdlog::error("Received unknown packet type " +
-                    std::to_string(static_cast<int>(packet.get_packet_type())));
+      spdlog::error("Received unknown packet type " + std::to_string(static_cast<int>(packet.get_packet_type())));
       return;
     }
     }
diff --git a/src/libmqttd/protocol/session.hpp b/src/libmqttd/protocol/session.hpp
index e1898eb..351ecf4 100644
--- a/src/libmqttd/protocol/session.hpp
+++ b/src/libmqttd/protocol/session.hpp
@@ -1,12 +1,14 @@
 #ifndef INCLUDE_PROTOCOL_SESSION_HPP_
 #define INCLUDE_PROTOCOL_SESSION_HPP_
 
+#include <cstddef>
 #include <packet_interface.hpp>
 #include <spdlog/spdlog.h>
 #include <string>
 #include <sys/socket.h>
 #include <thread>
 #include <unistd.h>
+#include <vector>
 
 const unsigned int buffer_size = 2048;
 
@@ -31,6 +33,7 @@ private:
   std::thread keepalive_thread;
 
   void listen();
+  std::size_t send(const std::vector<std::byte> &);
 };
 
 #endif // INCLUDE_PROTOCOL_SESSION_HPP_
diff --git a/src/libmqttd/types/variable_byte_int.cpp b/src/libmqttd/types/variable_byte_int.cpp
index a0332af..148bcfb 100644
--- a/src/libmqttd/types/variable_byte_int.cpp
+++ b/src/libmqttd/types/variable_byte_int.cpp
@@ -6,6 +6,8 @@
 
 VariableByteInteger::VariableByteInteger() {
   this->decoded_value = 0;
+  this->encoded_value = {std::byte(0)};
+  this->bytes_count = 1;
 }
 
 VariableByteInteger::VariableByteInteger(const uint32_t &value) {
diff --git a/src/mqttd.cpp b/src/mqttd.cpp
index 1dbe437..006f303 100644
--- a/src/mqttd.cpp
+++ b/src/mqttd.cpp
@@ -22,16 +22,13 @@ void termination_handler(int signal_num) {
 }
 
 void set_signal_handlers() {
-  std::set<unsigned int> termination_signals = {
-      SIGILL,  SIGBUS, SIGFPE, SIGSEGV, SIGSYS,
-      SIGABRT, SIGHUP, SIGINT, SIGQUIT, SIGTERM};
+  std::set<unsigned int> termination_signals = {SIGILL, SIGBUS, SIGFPE, SIGSEGV, SIGSYS, SIGABRT, SIGHUP, SIGINT, SIGQUIT, SIGTERM};
 
   // Blocking signals with set
   sigset_t block_mask;
   sigemptyset(&block_mask);
   sigprocmask(SIG_BLOCK, &block_mask, NULL);
-  for (auto it = termination_signals.begin(); it != termination_signals.end();
-       it++) {
+  for (auto it = termination_signals.begin(); it != termination_signals.end(); it++) {
     sigaddset(&block_mask, *it);
   }
 
@@ -40,19 +37,17 @@ void set_signal_handlers() {
   sigHandler.sa_handler = termination_handler;
   sigHandler.sa_mask = block_mask;
   sigHandler.sa_flags = 0;
-  for (auto it = termination_signals.begin(); it != termination_signals.end();
-       it++) {
+  for (auto it = termination_signals.begin(); it != termination_signals.end(); it++) {
     sigaction(*it, &sigHandler, NULL);
   }
 }
 
 int main() {
-  std::cout << "MQTTd Version " << MQTTD_VERSION_MAJOR << "."
-            << MQTTD_VERSION_MINOR << "." << MQTTD_VERSION_PATCH << std::endl;
-
+  std::cout << "MQTTd Version " << MQTTD_VERSION_MAJOR << "." << MQTTD_VERSION_MINOR << "." << MQTTD_VERSION_PATCH << std::endl;
   set_signal_handlers();
 
   spdlog::set_level(spdlog::level::trace);
+
   clistener.start();
   clistener.join();
 
diff --git a/src/version.hpp b/src/version.hpp
index b5cdb66..d0b7685 100644
--- a/src/version.hpp
+++ b/src/version.hpp
@@ -1,5 +1,5 @@
 #define MQTTD_VERSION_MAJOR 0
 #define MQTTD_VERSION_MINOR 0
 #define MQTTD_VERSION_PATCH 1
-#define MQTTD_COMMIT_HASH 65302458650650a7d293cf3fbe8bbf65501f242e
-#define MQTTD_BUILD_TIMESTAMP 1707058988
+#define MQTTD_COMMIT_HASH fd49879ba9e777030db160223c904c842f2983a6
+#define MQTTD_BUILD_TIMESTAMP 1707613195