Pypilot heading display

[oldjohn]

If I turn the pypilot it immediately shows the new compass reading. My esp32 continues to show the old reading for 30secs or more. Checking port 20220  with opencpn debug shows the correct readings, so the problem is with the esp, maybe my code?

void loop() {
 WiFiClient client;

 if (!client.connect(host, port)) {
  Serial.println("Connection to host failed");
  delay(4000);
  return;
 } // end if

 Serial.println("Connected to server successful!");

   
  while (client.connected()){
    if (client.available()) {
           
     String NMEAline = client.readStringUntil('\n'); //Read one line of the NMEA output 
    if(NMEAline.startsWith("$APHDM")){ //Check if it is the APHDM one which contains the info I want
     Serial.println(NMEAline); //Print it out over serial
     delay(500);    
    } // end if
  } // end while
  } // end line if
} // end loop