I now run this command:
MATTERMOST_TOKEN=TOKEN_HERE MATTERMOST_ENDPOINT=http://localhost:8080/hubot/incoming MATTERMOST_INCOME_URL=INCOME_URL_HERE ./bin/hubot --adapter mattermost
And get this:
[Thu Feb 25 2016 14:11:06 GMT+0100 (CET)] INFO hubot-redis-brain: Using default redis on localhost:6379
But bot is still not connecting