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With mosquitto_sub and hex output format, if the message contains byte values less than 16, the leading zeros are not printed.
I believe this is the spot in the code:
Perhaps just using "%02x" there would do it. As well as "%02X" a few lines down for the upper-case hex.
Always print leading zeros in mosquitto_sub when output format is hex.
Thanks to skiizo.
Agreed! I've fixed this on the fixes branch. Thanks for the report.