What are the most common communication protocols used in IoT, and how do you choose the right one?

When it comes to IoT communication protocols like MQTT, CoAP, Zigbee, Bluetooth, or Wi-Fi, how do you decide which is the best fit for your specific use case? I know each protocol has its own strengths—some are better for low-power devices, while others offer better range. What’s been your experience in choosing the right protocol, and what trade-offs have you faced?