Hello,
I knew that MQTT works on TCP/IP network. But MQTT is application layer IoT protocol.
Whether it used all the functionalities of TCP or only some functionalities? If I want to verify that which functionalities of TCP it actually uses, how can I do that?
Need some guidance.
Regards,
Vishal
Hi,
MQTT over TCP. The Message Management Service (MMS) supports native MQTT over TCP as a network transport method. For more information, please refer to theMQTT specification . To send data to the MMS through MQTT, a device needs toconnect to an MQTT broker and then send MQTT-compliant messages over this connection.
MQTT. MQTT (Message Queuing Telemetry Transport) is an ISO standard (ISO/IEC PRF 20922) publish-subscribe-based messaging protocol. It works on top of theTCP/IP protocol. ... MQTT-SN is a variation of the main protocol aimed at embedded devices on non-TCP/IP networks, such as Zigbee.
In simple words, MQTT requires connection oriented transport... which includes, state, retransmission, packet reordering.. etc.. why does it need all that?
Well it has to make sure that all subscribers subscribed to that topic actually have received published data. Can we use UDP to do that? Nope, obviously! Hence MQTT uses TCP as transport.
But in my paper, I have done this with new transport protocol developed by Google called QUIC. You can read the paper and get an idea how much limitations TCP can bring as transport. Article Implementation and analysis of QUIC for MQTT
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