v0.8.9

Full Changelog: v0.8.8...v0.8.9

Updated the HiveMQ CA file.

Recently, HiveMQ Cloud changed such that hivemq-com-chain.der (a Certificate Authority (CA) file) is not transferrable across different broker instances. The latest hivemq-com-chain.der file from self-driving-lab-demo will be hard-coded to the self-driving-lab-demo public test credentials (i.e., what is used in Module 1 - Running the Demo), so the tutorials should run without issue as long as you are using that file. However, the assignment requires you to have your own HiveMQ Cloud broker instance, so you will need to generate a hivemq-com-chain.der file specific to your instance and upload it to your microcontroller in place of the default one.