那java换成python呢
openmv的HOST需要改成运行python代码的ip

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind(('0.0.0.0', 12345))
s.listen(10)

while True:
    print "serber started"
    client, addr = s.accept()
    client.send(b'aaaaa')
    client.close()

openmv代码，SSID和KEY需要修改成可以连接的wifi

# Connect Example
#
# This example shows how to connect your OpenMV Cam with a WiFi shield to the net.

import network,usocket, sys, json,socket

SSID='ymc' # Network SSID
KEY='44661122'  # Network key
HOST = '192.168.191.2'           # Use first available interface #192.168.199.220
PORT = 12345         # Arbitrary non-privileged port

# Init wlan module and connect to network
print("Trying to connect... (may take a while)...")

wlan = network.WINC()
wlan.connect(SSID, key=KEY, security=wlan.WPA_PSK)

# We should have a valid IP now via DHCP
print(wlan.ifconfig())

s = usocket.socket(usocket.AF_INET, usocket.SOCK_STREAM)

s.connect([HOST, PORT])

#s.send("this is from car1")

try:
#一个个读数据试试
    data = s.recv(100)
    print ("data is:",str(data))
    s.close()
except OSError as e:
    s.close()
    print("socket error: ", e)

java代码

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class SocketTest {

    public static void main(String[] args) {
        try {
            ServerSocket serverSocket = new ServerSocket(12345);
            Socket socket = serverSocket.accept();
            OutputStream outputStream = socket.getOutputStream();
            outputStream.write("aaasdfsdfdsf".getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

结果

麻烦你了。

那现在这个问题是什么情况呢？

recv函数存在bug

这是我在国外OpenMV论坛看到的消息，recv函数存在bug，导致上层封装会认为接收到的数据为0 bytes，导致无法正常获得数据，并且他提供了固件升级的压缩包。
OpenMV论坛帖子

通过wifi拓展版连接上了wifi，并且通过socket发送数据给其他电脑成功，但是通过socket.read(1024)方法，一直无法获取数据。
图中的b' '就是打印的数据。