The err about wificlient

Technical Discussion Arduino SDK
1

I create wifiserver using the software USR-TCP-232-Test,after unplug the cables between router and pc(server in this pc, call client.connected() still return 1。

board is amb23;
sdk is 3.1.6
arduino is 1.8.19
code is following

#include <WiFi.h>

char ssid[] = "maybetest"; // your network SSID (name)
char pass[] = "123456789";    // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0;            // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;
IPAddress server(192,168,1,100);  // numeric IP for Google (no DNS)

WiFiClient client;
void setup() {
    //Initialize serial and wait for port to open:
    Serial.begin(115200);
    while (!Serial) {
        ;
    }
    // check for the presence of the shield:
    if (WiFi.status() == WL_NO_SHIELD) {
        Serial.println("WiFi shield not present");
        // don't continue:
        while (true);
    }

    // attempt to connect to Wifi network:
    while (status != WL_CONNECTED) {
        Serial.print("Attempting to connect to SSID: ");
        Serial.println(ssid);
        // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
        status = WiFi.begin(ssid, pass);

        // wait 10 seconds for connection:
        delay(10000);
    }
    Serial.println("Connected to wifi");
    Serial.println("\nStarting connection to server...");
    // if you get a connection, report back via serial:
    if (client.connect(server, 8888)) {
        Serial.println("connected to server");
    }
    delay(100);
}

void loop() {
    //idel task
    delay(2000);
    Serial.print(",wifi_s:");
    Serial.print(WiFi.status());
    Serial.print(",client_s:");
    Serial.println(client.connected());
}