Which protocol is commonly used for communication between IoT devices and cloud platforms for reliability?

The protocol commonly used for communication between IoT devices and cloud platforms for reliability is MQTT (Message Queuing Telemetry Transport).

Here are the steps explaining why:

1. IoT devices generate data that needs to be sent to cloud platforms for processing and analysis. This data transmission needs to be reliable to ensure that no data is lost in transit.

2. MQTT is a protocol designed for lightweight publish-subscribe messaging, making it ideal for IoT devices which often have limited processing power and battery life.

3. MQTT is reliable because it offers three levels of Quality of Service (QoS):

   • QoS 0: The message is delivered at most once, or it may not be delivered at all. This is the fastest method but also the least reliable.
   • QoS 1: The message is delivered at least once, but it may be delivered more than once. This is slower but more reliable than QoS 0.
   • QoS 2: The message is delivered exactly once. This is the slowest method but also the most reliable.

4. MQTT also supports persistent sessions, which means that a client can disconnect and later reconnect without losing any messages. This is another feature that makes MQTT reliable for IoT communication.

5. Finally, MQTT uses a broker for message delivery, which means that the sender and receiver do not need to be online at the same time. This is particularly useful for IoT devices, which may not always be connected to the internet.