Currently known server, ip192.168.10.1, port number8123, languageC, communication protocoludp
Note: The server only receives requests from clients with port number8234

The code below was found online. It can send a successful request, but cannot receive a return value.
You can see with the packet capture tool that every time a request is sent, the port number on my side is dynamic, starting from about 49k, and increasing by 1 for each request.
The port number is incorrect, so the server will naturally not return a value to me.

function udpGet($sendMsg){ $handle = stream_socket_client("udp://192.168.10.1:8123", $errno, $errstr); if( !$handle ){ die("ERROR: {$errno} - {$errstr}\n"); } fwrite($handle, $sendMsg."\n"); $result = fread($handle, 1024); fclose($handle); return $result; } $result = udpGet('Hello World'); echo $result;

How to solve this problem? I checked some information, but did not find a solution.