DTLS vs direct use of AES. What are the threats unique for direct use of AES instead of DTLS?

For regular traffic in mesh network (between Internet of Thing devices) customer decided to use one of two options:

DTLS PSK ciphersuite – DTLS based on pre-shared symmetric key
or direct use of AES – customer wants to minimize traffic be… Continue reading DTLS vs direct use of AES. What are the threats unique for direct use of AES instead of DTLS?