MQTT Comparison with HTTP for Huge payalods

[Ankit Srivastava]

HI,

Is there any comparison of MQTT message exchange against HTTP for huge payloads i.e. of the size of hundred of KBs?

Any analysis in terms of bandwidth consumption, message delivery time and data loss would be good.

Regards,

Ankit

[Paul Fremantle]

Ankit

I can't imagine there is a big difference when the payload is big, because the overhead of the headers in HTTP will be proportionally less.

However, HTTP has chunking support which will potentially make a difference.

Paul

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Paul Fremantle

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[Ankit Srivastava]

Thanks Paul,

I understand it better now.

Where can I find the MQtt Control packet's size details?

For example, what is the message exchange size for CONNECT, PUBLISH assuming a predefined payload(lets say 1KB).

I am  trying to analyse how much bandwidth would be consumed by a single client in a day if it uses MQTT pub sub model with a single topic to publish and is subscribed to a single topic(lest assume 1 publish on this topic every hour).

Regards,

Ankit 

[Paul Fremantle]

The MQTT packet specification is here: 

https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.pdf

The basic summary is that:

There is an initial CONNECT which contains u/p, a client id and a couple of bytes of header.

Then the device can either SUBSCRIBE or PUBLISH.

SUBSCRIBE is typically once per session and is just a couple of bytes plus the topic.

PUBLISH is 2 bytes, the topic, plus the data. These are all dependent on the exact way you use the protocol (e.g. QoS0,1,2). 

Paul

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