Constants.py

TOPIC_CONTEXT  = 'context'
TOPIC_TOPOLOGY = 'topology'
TOPIC_DEVICE   = 'device'
TOPIC_LINK     = 'link'
TOPIC_SERVICE  = 'service'

TOPICS = {TOPIC_CONTEXT, TOPIC_TOPOLOGY, TOPIC_DEVICE, TOPIC_LINK, TOPIC_SERVICE}

CONSUME_TIMEOUT = 0.5 # seconds