mqtt-simple - Very simple MQTT implementation

       Juerd Waalboer <juerd@tnx.nl>

       -h --host                MQTT server to connect to, required.

       -p --publish topic       Publish  a  message.  Uses  the message given with "-m", or will read lines from
                                stdin, and publish a message for each given line.

       -m --message message     Message to publish. Requires "-p".

       -r --retain              Causes messages published with "-p" to have the "retain" flag on.

       -s --subscribe filter    Subscribe to the given topic filter. Use the standard MQTT  wildcards  like  "+"
                                and  "#".  Outputs  matching published messages on stdout. Can be given multiple
                                times.

       -e --except filter       Suppress published messages that match filter. Can be given multiple times.

       --count number           Quit after receiving number messages.

       --message-only           Output only the message values, without the topics.

       -1 --one                 Shortcut for "--count 1 --message-only".

       --color
       --no-color               For each given "-s", print the matching topic in a different  color.  Note  that
                                the first matching topic will be used for color selection, so specify the topics
                                with the most specific one first, the least specific one (like "#") last.

                                Color is enabled by default if stdout is a terminal.

       --raw                    Pass  ASCII  control  characters unaltered. By default, they're replaced by "^@"
                                notation or, when "--color" is enabled, reverse video characters.  For  example,
                                an ASCII newline would be displayed as "^J" unless "--raw" is used.

       -d --datetime format     Prefix  messages  with  a  timestamp. Optionally, a format for "strftime" can be
                                supplied.

       -u --user --username username
                                Specify a username. Overrides the environment variable "MQTT_SIMPLE_USERNAME".

       --pass --password password
                                Specify a password. Overrides the environment variable "MQTT_SIMPLE_PASSWORD".

   SSLoptions
       --ssl                    Use SSL instead of unencrypted connection.

       --insecure               Disable SSL certificate validation and enable clear text passwords.  Useful  for
                                testing, bad idea in production.

                                Overrides    the    environment    variables    "MQTT_SIMPLE_SSL_INSECURE"   and
                                "MQTT_SIMPLE_ALLOW_INSECURE_LOGIN".

       --ca path                The Certificate Authority  to  validate  against.  path  can  be  a  file  or  a
                                directory.  If  unspecified,  IO::Socket::SSL attempts to use the system wide CA
                                configuration.

                                Overrides the environment variable "MQTT_SIMPLE_SSL_CA".

       --cert path
       --key path               A client certificate with its key.

                                Override    the     environment     variables     "MQTT_SIMPLE_SSL_CERT"     and
                                "MQTT_SIMPLE_SSL_KEY".

       This is just a simple utility program. It doesn't do much. Specifically, all the QoS features are
       unsupported. Also, don't expect fancy error messages and such :-)

       Pick your favourite OSI approved license :)

       http://www.opensource.org/licenses/alphabetical

       mqtt-simple - Very simple MQTT implementation

       Net::MQTT::Simple

perl v5.36.0                                       2023-10-30                                    MQTT-SIMPLE(1p)

        mqtt-simple -h mqtt.example.org -c -s "sensors/#" -s "debug/#" -s "#"

        mqtt-simple -h mqtt.example.org -p "example/unretained" -m "message"

        mqtt-simple -h mqtt.example.org -r -p "example/retained" -m "message"

        tail -f logfile | mqtt-simple -h mqtt.example.org -p "log/example"

        mqtt-simple --ssl --insecure ...

        mqtt-simple --ssl --ca ca.crt --cert client.crt --key client.key