my recv breaks my send which is just before - c

Question

I'm trying to make a program that uses sockets between a client and a server. In my code below if I comment on the loop while my server receives my message but if I do not comment my client seems not to send my message (finally my server never receives my message). Why ?
Server
int main()
{
message = malloc(sizeof(char));
printf("Waiting for incoming connections ...\n");
sem_init(&lock, 0, 1);
// socket creation
int server_socket;
server_socket = socket(AF_INET, SOCK_STREAM, 0);
// dserver address9002
struct sockaddr_in server_address;
server_address.sin_family = AF_INET;
server_address.sin_port = htons(PORT);
server_address.sin_addr.s_addr = INADDR_ANY;
// bind the socket to IP and port
bind(server_socket, (struct sockaddr*) &server_address, sizeof(server_address));
listen(server_socket, MAX_CONNECTIONS);
int client_socket;
int i = 0;
while(client_counter < 2 && (client_socket = accept(server_socket, NULL,NULL)))
{
client_counter++;
client_sockets[i] = client_socket;
i++;
printf("new client ! \n");
}
//here i create a thread for each client and in this thread there is a while loop with a recv function
}
Client
int socket_connection(char* ip, int port)
{
int network_socket = 0;
struct sockaddr_in server_address;
server_address.sin_family = AF_INET;
server_address.sin_port = htons(port);
server_address.sin_addr.s_addr = inet_addr(ip);
if ((network_socket = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
printf("\n Socket creation error \n");
return -1;
}
int connection_status = connect(network_socket, (struct sockaddr*) &server_address, sizeof(server_address));
if (connection_status < 0)
{
printf("Error while creating / connecting the socket");
return -1;
}
return network_socket;
}
void connect_to_server()
{
char ip[256];
int port;
strcpy(ip, "127.0.0.1");
port = 9002;
// try to connect to the server with the IP and port
int network_socket = socket_connection(ip, port);
char server_reponse[256];
char message[256];
// clean string
memset(server_reponse, 0, sizeof(server_reponse));
recv(network_socket, &server_reponse, sizeof(server_reponse), 0);
if (strcmp(server_reponse, "instruction: make board") == 0)
{
construct_game_board();
show_game_board();
memset(message, 0, sizeof(message));
put_ship(message);
printf("Finish to make board\n");
}
printf("Reponse send to socket %d: %zu\n",network_socket, send(network_socket, message, strlen(message), 0));
while (1) {
printf("Before recv\n");
printf("Reponse recv : %zu\n", recv(network_socket, server_reponse, sizeof(server_reponse), 0));
printf("After recv\n");
}
In my console when i launch i have : Reponse send to socket 3: 0 and Before recv