Hi everyone! I'm a student and I'm studying the security of the CoAP protocol. So, thinking on the attack-surface my thought was about internal attacks (i.e inside the network) and the external attack (i.e. outside the network). Regarding them, considering the scenario without encryption (i.e. without DTLS) there could be done attacks such as MIT (i.e. man-in-the-middle). So, I was also wondering which kind of other attacks can be done? Can someone help me?