I would assume it is ready. Yesterday was the first I heard about this change. I am still confused about their timing. The email says the change is happening on July 1, 2022. But the blog says they have pushed things out to 2023. So I am a bit confused.
It appears that both certs will be valid until Sept 2023.
I currently store the Cert in flash storage. I load it over-the-air using a connection through my SIM provider Hologram. Currently, I only support 1 cert in my code I will have to do OTA updates to existing devices. I can kick off the OTA through the same connection so I don’t need Azure IoT to control the update process.
The cutover to the new Cert starts Feb 15, 2023, and thru October 15, 2023.
It looks like back in May 2022 they added SHA-256 for constrained devices.
They recommend BOTH the old Baltimore CyberTrust Root and the NEW DigiCert Global G2 CA root be added to the end device. (In the above document, “Action Required” section, item #2)
Using TinyCLR MQTT I don’t see any way to add more than one certificate using MqttClientSetting(). I assume it is important to have both since I assume the transition will happen to your IoT Hub sometime between Feb 15 and Oct 15.
Any thoughts on how to handle this short of switching Certs if authentication fails?