diff --git a/dependencies/tlibc b/dependencies/tlibc
index ba7a81d..447c15b 160000
--- a/dependencies/tlibc
+++ b/dependencies/tlibc
@@ -1 +1 @@
-Subproject commit ba7a81d205a7dfe49d64f0f9c6b8d97d693d5ec2
+Subproject commit 447c15bc467546aa80245a7c5bc15d46d1349661
diff --git a/src/main.c b/src/main.c
index 3341f6f..0338ad0 100755
--- a/src/main.c
+++ b/src/main.c
@@ -1,8 +1,11 @@
 #include "cryptography/cryptography.h"
 #include "network/network.h"
 #include "network/socket.h"
+#include <pthread.h>
+#include "tlibc/time.h"
+#include "errno.h"
 
-void test_aes(){
+Result(void) test_aes(){
     const str password = STR("abobus");
     const Array data = str_castTo_Array(STR("0123456789_hii_"));
     
@@ -32,18 +35,100 @@ void test_aes(){
     str decrypted_str = str_copy(str_construct(buffer.data, decrypted_size, false));
     printf("data decrypted (utf8): %s\n", decrypted_str.data);
     free(decrypted_str.data);
+    
+    return RESULT_VOID;
 }
 
-void test_server(){
-    try_fatal(_10, network_init(), );
+
+static pthread_mutex_t stdout_mutex = {0};
+
+// thread-safe print
+#define printf_safe(ARGS...) {\
+    pthread_mutex_lock(&stdout_mutex);\
+    printf(ARGS);\
+    fflush(stdout);\
+    pthread_mutex_unlock(&stdout_mutex);\
+}
+
+void* test_server(void* data){
+    printf_safe("[server]: opening main socket\n");
     try_fatal(main_socket, socket_open_TCP(), );
     EndpointIPv4 server_end = EndpointIPv4_create(AddressIPv4_LOOPBACK, 24500);
-    try_fatal(_20, socket_bind(main_socket.v_i64, server_end), );
-    try_fatal(_30, socket_listen(main_socket.v_i64, 64), );
-    try_fatal(_100, network_deinit(), );
+    try_fatal(_20, socket_bind(main_socket.v_i64, server_end), socket_close(main_socket.v_i64));
+    try_fatal(_30, socket_listen(main_socket.v_i64, 64), socket_close(main_socket.v_i64));
+    printf_safe("[server]: accepting client connection\n");
+    try_fatal(client_conn, socket_accept(main_socket.v_i64), socket_close(main_socket.v_i64));
+    
+    Array buf = Array_alloc(u8, 1024);
+    i32 read_n;
+    printf_safe("[server]: receiving data from client\n");
+    while((read_n = recv(client_conn.v_i64, buf.data, buf.size - 1, 0)) != -1){
+        if(read_n == 0){
+            sleepMsec(20);
+            continue;
+        }
+        char* data_s = (char*)buf.data;
+        char last_char;
+        while((last_char = data_s[read_n - 1]) == '\n' 
+            || last_char == '\r' || last_char == ' ' || last_char == ' ')
+        {
+            read_n--;
+        }
+        data_s[read_n] = '\0';
+        printf_safe("[server/out]: %s\n", (char*)buf.data);
+    }
+    socket_close(client_conn.v_i64);
+    printf_safe("[server]: client socket closed\n");
+    perror("errno:");
+    socket_close(main_socket.v_i64);
+    return NULL;
+}
+
+void* test_client(void* data){
+    printf_safe("[client]: opening socket\n");
+    try_fatal(client_socket, socket_open_TCP(), );
+    printf_safe("[client]: connecting to server\n");
+    EndpointIPv4 server_end = EndpointIPv4_create(AddressIPv4_LOOPBACK, 24500);
+    try_fatal(_20, socket_connect(client_socket.v_i64, server_end), socket_close(client_socket.v_i64));
+    Array buf = Array_alloc(u8, 1024);
+    i32 read_n = 999;
+    printf_safe("[client]: reading stdin\n");
+    while((read_n = read(STDIN_FILENO, buf.data, buf.size - 1)) > 0){
+        if(send(client_socket.v_i64, buf.data, read_n, 0) < 0){
+            socket_close(client_socket.v_i64);
+            printf_safe("[client]: can't send data to server\n");
+            exit(20);
+        }
+    }
+    printf_safe("[client]: stdin end\n");
+    socket_close(client_socket.v_i64);
+    return NULL;
+}
+
+Result(void) test_network(){
+    if(pthread_mutex_init(&stdout_mutex, NULL) != 0)
+        return RESULT_ERROR("can't init mutex", false);
+
+    pthread_t server_thread = {0};
+    if(pthread_create(&server_thread, NULL, test_server, NULL) != 0)
+        return RESULT_ERROR("can't create server thread", false);
+
+    sleepMsec(100);
+    test_client(NULL);
+
+    printf_safe("[main]: joining server thread\n");
+    if(pthread_join(server_thread, NULL) != 0)
+        return RESULT_ERROR("can't join server thread", false);
+    if(pthread_mutex_destroy(&stdout_mutex) != 0)
+        return RESULT_ERROR("can't destroy mutex", false);
+    printf_safe("[main]: completed\n");
+    return RESULT_VOID;
 }
 
 int main(){
-    test_server();
+    try_fatal(_10, network_init(), );
+    // try_fatal(_20, test_aes(), );
+    try_fatal(_30, test_network(), );
+    try_fatal(_100, network_deinit(), );
     return 0;
 }
diff --git a/src/network/socket.c b/src/network/socket.c
index 0467be9..5db672c 100755
--- a/src/network/socket.c
+++ b/src/network/socket.c
@@ -44,3 +44,10 @@ Result(Socket) socket_accept(Socket main_socket) {
     Socket user_connection = accept(main_socket, (struct sockaddr*)&remote_addr, (void*)&sockaddr_size);
     return RESULT_VALUE(i64, user_connection);
 }
+
+Result(void) socket_connect(Socket s, EndpointIPv4 remote_end){
+    struct sockaddr_in sockaddr = EndpointIPv4_toSockaddr(remote_end);
+    if(connect(s, (void*)&sockaddr, sizeof(sockaddr)) != 0)
+        return RESULT_ERROR("connect() failed", false);
+    return RESULT_VOID;
+}
diff --git a/src/network/socket.h b/src/network/socket.h
index b057773..dbe4c43 100755
--- a/src/network/socket.h
+++ b/src/network/socket.h
@@ -15,4 +15,5 @@ void socket_close(Socket s);
 Result(void) socket_shutdown(Socket s, SocketShutdownType direction);
 Result(void) socket_bind(Socket s, EndpointIPv4 local_end);
 Result(void) socket_listen(Socket s, i32 backlog);
-Result(Socket) socket_accept(Socket main_socket);
\ No newline at end of file
+Result(Socket) socket_accept(Socket s);
+Result(void) socket_connect(Socket s, EndpointIPv4 remote_end);