Hi Stephen, Thank you so much for your love and support. The error which you are saying I have not faced so far but I would love to replicate and fix. Can you please provide more context on this. Please feel free to reach out to me. Also meanwhile you can try some troubleshooting if works for you. Check the MQTT Broker Address: Ensure that the address and port you are using to connect to the MQTT broker are correct. Double-check the broker address, port, and the protocol (e.g., mqtt:// vs mqtts://). MQTT Broker Configuration: If you're using an MQTT broker on your local machine (e.g., HiveMQ or Mosquitto), ensure that it is properly configured to accept external connections. Check firewall settings and ensure that the correct port (typically 1883 for non-SSL, or 8883 for SSL) is open. Network Issues: Make sure that your Raspberry Pi Pico W is connected to the same network as the MQTT broker. Sometimes, network issues can cause the connection to be aborted. Broker Authentication: If the broker requires authentication, make sure that you are passing the correct username and password while connecting. Timeout or Connection Limit: Verify that the MQTT broker is not rejecting your connection due to too many simultaneous connections or timeouts. If your broker has rate limits, try connecting after some time or reduce the frequency of your connection attempts. Python Version and Library Compatibility: Ensure that you are using compatible versions of MicroPython and the umqtt.simple library. Try updating your firmware on the Raspberry Pi Pico W to the latest version and reinstall the MQTT library. Wi-Fi Stability: Check the stability of your Wi-Fi connection. A weak Wi-Fi connection might cause connection timeouts or aborted connections. Error Handling: Add error handling in your code to retry connections or log more detailed information about the error, which can help in debugging.