IoT runs across a range of use cases and connections. There is a lot of emphasis on WiFi IoT applications, but this makes things hard in other places. I'm work

IoT runs across a range of use cases and connections. There is a lot of emphasis on WiFi IoT applications, but this makes things hard in other places. I'm working on various IoT sensor products that require a cellular connection - NB-IoT is preferred for this use case due to the good penetration characteristics. But the problem is that UDP is recommended as the NB-IoT transport layer due to the problem with TCP ack timeouts due to NB-IoT latency. That means that you are practically reduced to MQTT-SN as a data protocol, which in turn means you lose TLS. There are partial solutions - we whitelist our MQTT data sources (i.e. only the Cellular provider's NB-IoT gateway), and we can verify and whitelist the IDs of all connected devices). But it is a partial and imperfect solution. Security is hard...