Hello World example not working with Mosquitto broker

[jose1711]

The Hello World example in https://github.com/tve/mqboard/blob/master/mqtt_async/README.md is not working with Mosquitto broker. Default setting of keepalive is 0, Mosquitto however does not support such setting:

$ mosquitto_pub -p 1883 -h HOST -t 'topic/subtopic' -m elho -u USER -P PASS -k 0                               
Error: Invalid keepalive given, it must be between 5 and 65535 inclusive.

There are two ways how to fix it:

• either set keepalive to 5 in mqtt_async.py in this section:

  if lw is None:
    keepalive = 0

  or

• set keepalive and will manually in config:

  from mqtt_async import MQTTClient, config, MQTTMessage
  ..
  config['keepalive'] = 0
  config['will'] = MQTTMessage('special/msg', 'bye')