Re: MQTT

On Wed, 15 Apr 2020, Roger Light via curl-library wrote:

> ./curl 'mqtt://test.mosquitto.org/de.wsv/pegel/cm/ems/emshoern' --output -
>
> That topic currently has a retained message with content "582". The
> response I get from curl is:
>
> curl: (8) Weird server reply
> de.wsv/pegel/cm/ems/emshoern582

I cannot reproduce that. Doing that command line here seems to get a partial
response and then it sits waiting for the rest:

$ curl 'mqtt://test.mosquitto.org/de.wsv/pegel/cm/ems/emshoern' -o dump
--trace -
...
=> Send header, 35 bytes (0x23)
0000: 82 21 00 01 00 1c 64 65 2e 77 73 76 2f 70 65 67 .!....de.wsv/peg
0010: 65 6c 2f 63 6d 2f 65 6d 73 2f 65 6d 73 68 6f 65 el/cm/ems/emshoe
0020: 72 6e 00 rn.
<= Recv header, 5 bytes (0x5)
0000: 90 03 00 01 00 .....
<= Recv header, 1 bytes (0x1)
0000: 31 1
<= Recv header, 1 bytes (0x1)
0000: 21 !
== Info: Remaining length: 33 bytes
<= Recv data, 33 bytes (0x21)
0000: 00 1c 64 65 2e 77 73 76 2f 70 65 67 65 6c 2f 63 ..de.wsv/pegel/c
0010: 6d 2f 65 6d 73 2f 65 6d 73 68 6f 65 72 6e 35 38 m/ems/emshoern58
0020: 32 2
100 33 100 33 0 0 2 0 0:00:16 0:00:15 0:00:01
^C

> From what I glanced at on the twitch stream I think the focus has been on
> publishing

No it hasn't. I even did subscribe first. And we have test cases for both
subscribe and publish in the test suite.

But I'm a MQTT rookie, I'm sure there are mistakes and glitches in there to
fix!

> ./curl mqtt://test.mosquitto.org/de.wsv/#
> ./curl 'mqtt://test.mosquitto.org/de.wsv/#'
>
> Which I would expect would subscribe using the multilevel wildcard '#'. I
> tried both forms to try and be sure that it wasn't the shell swallowing the
> #.

'#' is special in URLs, as it marks a fragment. You need to URL encoded such
characters as %23.

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