# Client disconnected when using WiFi AP

**URL:** <https://forum.amebaiot.com/t/client-disconnected-when-using-wifi-ap/4104>\
**Category:** WiFi\
**Tags:** evb-amb82, rtl8735b\
**Created:** [May 8, 2025, 2:56pm UTC](https://forum.amebaiot.com/t/client-disconnected-when-using-wifi-ap/4104 "2025-05-08T14:56:55Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Coolbro69](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/coolbro69/32/2624_2.png) [@Coolbro69](https://forum.amebaiot.com/u/Coolbro69)\
**Post date:** [May 8, 2025, 2:56pm UTC](https://forum.amebaiot.com/t/client-disconnected-when-using-wifi-ap/4104/1 "2025-05-08T14:56:56Z")

</div>

我嘗試在AMB82上建立WiFi AP，電腦可以連上AP，然後電腦的python程式可以跟AMB82透過訊息溝通，但是當透過WiFi client建立連線，馬上就會client disconnected。訊息根本無法傳送。  
我用的是arduino IDE，版本是4.0.9-build20250325。同樣的程式碼在esp32上面不會有馬上client disconnect的問題，拜託幫幫忙  
以下是簡單的ino程式碼:  
#include \<WiFi.h\>

// AP configuration  
char ssid = “AMB82\_AP”; // AP SSID  
char pass = “12345678”; // AP password (minimum 8 characters)  
char channel = “1”; // AP channel  
int ssid\_status = 0; // 0 = visible SSID, 1 = hidden SSID  
int status = WL\_IDLE\_STATUS; // WiFi status indicator

WiFiServer server(80); // Create server on port 80

void setup() {  
// Initialize serial communication  
Serial.begin(115200);  
while (!Serial) {  
; // wait for serial port to connect  
}

```auto
// Start Access Point
Serial.print("Setting up Access Point with SSID: ");
Serial.println(ssid);

status = WiFi.apbegin(ssid, pass, channel, ssid_status);

// Wait for AP to initialize
delay(5000);

if (status != WL_CONNECTED) {
    Serial.println("Failed to set up AP. Retrying...");
    while (status != WL_CONNECTED) {
        status = WiFi.apbegin(ssid, pass, channel, ssid_status);
        delay(5000);
    }
}

// AP started
Serial.println("AP mode started successfully");
printWifiData();

// Start the server
server.begin();
Serial.println("Server started and listening on port 80");

```

}

void loop() {  
// Check if a client has connected  
WiFiClient client = server.available();

```auto
if (client) {
    Serial.println("New client connected");
    
    // While client is connected
    while (client.connected()) {
        // If there's data available to read
        if (client.available()) {
            String message = client.readStringUntil('\n');
            
            // Print received message to serial monitor
            Serial.print("Received: ");
            Serial.println(message);
            
            // Send a response back to the client
            String response = "AMB82 received: " + message;
            client.println(response);
            
            // Ensure the data is sent
            client.flush();
        }
    }
    
    Serial.println("Client disconnected");
}

```

}

void printWifiData() {  
// Print WiFi AP information  
IPAddress ip = WiFi.localIP();  
Serial.print("IP Address: ");  
Serial.println(ip);

```auto
Serial.print("SSID: ");
Serial.println(WiFi.SSID());

// Print the MAC address of AP
byte bssid[6];
WiFi.BSSID(bssid);
Serial.print("BSSID: ");
for (int i = 0; i < 5; i++) {
    Serial.print(bssid[i], HEX);
    Serial.print(":");
}
Serial.println(bssid[5], HEX);

// Print the encryption type
byte encryption = WiFi.encryptionType();
Serial.print("Encryption Type: ");
Serial.println(encryption, HEX);
Serial.println();

```

}

與之對應的python程式碼:  
import socket  
import time

def connect\_to\_amb82():  
print(“Attempting to connect to AMB82-Mini AP…”)

```auto
# AMB82 AP information
host = "192.168.1.1" # Default IP of AMB82 when in AP mode
port = 80 # Port the server is running on

# Create a socket object
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

try:
    # Connect to the AMB82
    s.connect((host, port))
    print(f"Connected to AMB82 at {host}:{port}")
    return s
except socket.error as e:
    print(f"Connection failed: {e}")
    print("Make sure your computer is connected to the AMB82_AP WiFi network")
    return None

```

def send\_message(sock, message):  
if sock is None:  
print(“Not connected to AMB82”)  
return

```auto
try:
    # Send message with newline terminator
    sock.send((message + "\n").encode())

    # Receive response
    response = sock.recv(1024)

    # Display the response
    if response:
        print("\nResponse from AMB82:")
        print(response.decode('utf-8', errors='ignore'))
    else:
        print("\nNo response received from AMB82")

except socket.error as e:
    print(f"Error sending/receiving: {e}")

```

def interactive\_mode():

# Connect to AMB82

sock = connect\_to\_amb82()  
if sock is None:  
return

```auto
print("\nEntering interactive mode. Type 'exit' to quit.")

try:
    while True:
        # Get message from user
        message = input("> ")
        if message.lower() == 'exit':
            break

        # Send message
        send_message(sock, message)

except KeyboardInterrupt:
    print("\nExiting...")
finally:
    if sock:
        sock.close()
        print("Connection closed")

```

if **name** == “ **main** ”:  
print(“AMB82-Mini Communication Client”)  
print(“-------------------------------”)  
interactive\_mode()

---

<div class="post-metadata">

**Author:** ![Coolbro69](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/coolbro69/32/2624_2.png) [@Coolbro69](https://forum.amebaiot.com/u/Coolbro69)\
**Post date:** [June 3, 2025, 10:08am UTC](https://forum.amebaiot.com/t/client-disconnected-when-using-wifi-ap/4104/2 "2025-06-03T10:08:16Z")

</div>

後來發現，是client.available()在搞鬼，把這個去除就好。希望瑞昱能把這個bug修掉