mq

Install mosquitto

For a Debian/Ubuntu system:

apt-get install mosquitto

Configure Mosquitto

Create /etc/mosquitto/conf.d/acl.conf with just the following contents:

acl_file /etc/mosquitto/conf.d/acl.txt

Now populate that with:

topic readwrite clients/#

The result of this will be that any client can connect without any username/password, and read/write to the topics beneath clients.

For example client with the name cake can read/write to the topic clients/cake.

Test Subscription

You should find that you can subscribe to the wildcard topic clients/# via:

 $ mosquitto_sub -v -t clients/#

Now you're good.

Of course this does mean that clients can sniff on other user's traffic..