make-mqtt-client | chickadee

id: String to use as the client id. If #f, a random client id will be generated. If id is #f, clean-session must be #t.
clean-session: set to #t to instruct the broker to clean all messages and subscriptions on disconnect, #f to instruct it to keep them. Note that a client will never discard its own outgoing messages on disconnect. Calling mqtt-connect or mqtt-reconnect will cause the messages to be resent. Use mqtt-reinitialise to reset a client to its original state. Must be set to #t if the id parameter is #f.
user-data: user data that will be passed with cleint argument to any callbacks that are specified.
on-connect: Connect callback. Look set-mqtt-client-connect-callback!
on-disconnect: Disconnect callback. Look set-mqtt-client-disconnect-callback!
on-publish: Publish callback. Look set-mqtt-client-publish-callback!
on-message: Message callback. Look set-mqtt-client-message-callback!
on-subscribe: Subscribe callback. Look set-mqtt-client-subscribe-callback!
on-unsubscribe: Unsubscribe callback. Look set-mqtt-client-unsubscribe-callback!
on-log: Logging callback. Look set-mqtt-client-log-callback!

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