Hello Rose-M,
Welcome to the Microsoft Q&A and thank you for posting your questions here.
I understand that you would like to know the protocols supported by Azure IoT Operations.
As of now, Azure IoT Operations supports OPC-UA and MQTT for device communication - https://zcusa.951200.xyz/en-us/azure/iot-operations/overview-iot-operations and https://zcusa.951200.xyz/en-us/azure/iot-operations/troubleshoot/iot-operations-faq These protocols are widely used in industrial and IoT applications for their reliability and efficiency.
Regarding future plans for supporting other protocols like HTTPS, AMQP, PROFIBUS, and TCP/IP, there hasn't been any official announcement yet. However, Azure IoT Hub, which is closely related to Azure IoT Operations, supports additional protocols such as HTTPS and AMQP - https://zcusa.951200.xyz/en-us/azure/iot-hub/iot-hub-devguide-protocols). This might indicate potential future support for these protocols in Azure IoT Operations as well.
If you have specific requirements or use cases, it might be helpful to provide feedback directly to Microsoft through their official channels.
I hope this is helpful! Do not hesitate to let me know if you have any other questions.
Please don't forget to close up the thread here by upvoting and accept it as an answer if it is helpful.