MQTT subscription topic match
Jelly, 20 bytes

ṣ€”/ZṖF”#eƊ¿œiÐḟ”+ZE


A monadic Link accepting a list of lists of characters, [topic, pattern], which returns 1 or 0 for match or no-match respectively.

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How?

ṣ€”/ZṖF”#eƊ¿œiÐḟ”+ZE - Link: list of lists of characters, [topic, pattern]
 €                   - for each:
ṣ                    -   split at occurrences of:
  ”/                 -     '/' character
    Z                - transpose (any excess of topic is kept)
           ¿         - while...
          Ɗ          - ...condition: last three links as a monad:
       ”#            -   '#' character
         e           -   exists in:
      F              -     flatten
     Ṗ               - ...do: pop the tail off
              Ðḟ     - filter discard those for which:
            œi       -   first multi-dimensional index of: ([] if not found, which is falsey)
                ”+   -     '+' character
                  Z  - transpose
                   E - all equal?