Requires NATS 2.x, which is currently unreleased, so must be built from master.
nats-sub -s nats://quser1:one@$NATS_SERVER:$NATS_PORT 'foo'
nats-sub -s nats://quser2:two@$NATS_SERVER:$NATS_PORT 'foo'
nats-pub -s nats://quser1:one@$NATS_SERVER:$NATS_PORT 'foo' hey
Message is received on session one, but not session two.