MQTT Client does not reconnect

[bblacey]

There is an invalid assumption that client:publish() returns an error if the client fails to publish a message to the mqtt broker. As a result, the vera client never reconnects to the broker because the tests for ~= nil after invoking :publish() never hold true.

It seems the lua mqtt client is not only incomplete, there is no one actively developing it any more therefore a quick and dirty fix that should work is to simply return the result of the client:message_write() from the client:publish() method.