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Questions about MQTT URI schemes #41

yufei-cai opened this issue Aug 9, 2018 · 1 comment


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commented Aug 9, 2018

1 Is there any intention to formalize MQTT URI scheme? The page has a prominent link from wiki homepage but the URI schemes mqtt and mqtts are not registered with IANA.

2 I assume the URI scheme mqtt refers to MQTT over TCP and mqtts refers to MQTT over TLS. What is the URI schemes of MQTT over websocket? How about MQTT over websocket over TLS?

For comparison, CoAP has URI schemes coap, coap+tcp, coap+ws, coaps, coaps+tcp, coaps+ws. The coap+<transport-protocol> pattern is extensible for any future transport protocol CoAP may incorporate, but IANA considers them usage incorrect enough to warrant a footnote.

I think formalizing the URI scheme is necessary. Otherwise client implementations are left to define their own URI schemes. #40 reports one such instance.


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commented Aug 9, 2018

Hi @yufei-cai - this is an issue tracker for the MQTT website. It is not related to the OASIS standardisation work.

If you have comments on the standard, please refer to the mqtt-comment mailing list, linked on this page:

The URI scheme has been discussed by the technical committee a few times. The proposal was to produce a committee note rather than make it a formal part of the spec. Unfortunately that hasn't happened yet (in part because I've had to step back from close involvement with the TC).

@knolleary knolleary closed this Aug 9, 2018

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