dump mosca for mosquitto

a sample conf: `/etc/mosquitto/conf.d/`

```
bind_address broker.tchap.me

listener 9884
protocol websockets

listener 1884
protocol mqtt

#port 1884
allow_anonymous false
password_file /etc/mosquitto/passwd

#log_dest file /var/log/mosquitto/mosquitto.log
#pid_file file /var/run/mosquitto.pid

autosave_on_changes true
persistence true
persistence_file mosquitto.db
```
