# Summary Learn about, and apply where appropriate, the features of MQTT such as LWIT, Retained, and QSO ## QOS <img width="657" height="684" alt="Image" src="https://github.com/user-attachments/assets/2bdee20f-5c21-4956-b161-8e315d81b622" /> ## LWIT <img width="497" height="721" alt="Image" src="https://github.com/user-attachments/assets/287316f6-4779-41d5-903e-9d07eba4acb4" /> ## Retained <img width="668" height="665" alt="Image" src="https://github.com/user-attachments/assets/9c04b031-8107-4858-8998-1db3c68ebeb9" />