static int Client_read(client_t *client);
static int Client_write(client_t *client);
static int Client_send_udp(client_t *client, uint8_t *data, int len);
static int Client_read(client_t *client);
static int Client_write(client_t *client);
static int Client_send_udp(client_t *client, uint8_t *data, int len);