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Lowest latency input
(lemmy.nz)
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this post was submitted on 01 Oct 2023
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Theoretically, MQTT would be faster than HTTP; with MQTT the clients all maintain a persistent connection to the server, so sending a message is just a case of sending another packet on the existing connection, where as HTTP in the worst case would require a DNS lookup, TCP connection setup and TLS handshake before the button press could be reported.
The downside of a persistent connection is you have to maintain a persistent connection - not an issue if you are hardwired, but for things in batteries it probably isn't practical
I have a wired device sending HTTP POST updates very regularly (often more than one per second) and if I watch those arrive, they appear almost instantaneous. If the sending device used IP (or, more likely, had cached the lookup) I guess that would be fast too.
Good point about the MQTT persistence, cheers.
Practically it doesn't make any real difference - unless your network is ancient/massively overloaded/completely screwed or your client device is low power enough to struggle with TLS the whole connection setup process is only going to take ~100ms at most