TLS 1.3 is going to save us all, and other why IoT is still insecure (2017)

Traffic to an IoT device passes through many different networks: the transit provider from the application server, the content delivery network used to deliver device traffic, the ISP to the building where the device sits. TLS is used in two ways in IoT devices: First, TLS is used to encrypt data in transit. Here’s what the same POST looks like with the TLS handshake — this is with TLS 1.2:

Depending on distance between the device and the application server and the latency of the server, this can be hundreds of milliseconds added.

Source: blog.cloudflare.com