Ensuring MQTT Data Security

Data transmitted using the MQTT protocol is in plain text, which means it can be intercepted if not encrypted. In Chapter 8.4.1, the TLS protocol is introduced as a means to ensure that data can only be decrypted by the communicating parties, thereby safeguarding data security and legitimacy.

Similarly, TLS can also be used for encryption in cloud communication over MQTT. Since it has already been covered in Chapter 8.4.1, this section only introduces what the certificates in the TLS handshake mean and what functions they perform, how to generate certificates locally, and how to set up a mutual authentication TLS environment based on the local MQTT broker.