def parse_slack_output(slack_rtm_firehose):
    """
    Checks slack events 'firehose' for user messages,
    returns user, message, channel
    """
    if slack_rtm_firehose and len(slack_rtm_firehose) > 0:
        for event in slack_rtm_firehose:
            if len(event) == 1:  # default first event
                print (event)
            if event and 'text' in event:
                return event['user'], event['text'].strip().lower(), event['channel']
    return None, None, None