## Configuration

### Broker Mosquitto

During installation, a [MQTT](https://en.wikipedia.org/wiki/MQTT) broker, [Mosquitto](https://mosquitto.org/), is installed at the same time as Domoticz.
This broker requires a dedicated domain or subdomain to work (ex : mqtt.your.domain.tld) : creating this domain prior installation is a prerequisite

#### Adding in domoticz

To use mosquitto, you need to customize the communication between domoticz and the broker by following the [domoticz documentation](https://www.domoticz.com/wiki/MQTT#Installing_Mosquitto), part *Add hardware "MQTT Client Gateway"*.
User and password are automatically generated during installation, you may retrieve them with
````
sudo yunohost app setting domoticz mqtt_user
sudo yunohost app setting domoticz mqtt_pwd
````

#### Publish/Subscribe

By default, mosquitto will listen on 2 ports:
- 1883 on localhost using mqtt protocol
- 8883 using websocket protocol. Nginx redirect external port 443 to this internal port.

Hence, To publish/subscribe on a topic from the outside, you have to use a software supporting websocket protocol (ex : paho python library).

#### Mosquitto_pub et mosquitto_sub

These 2 tools do not support websocket protocol, only direct mqtt: base settings will not allow communication from an outside device.
If you're using them directly from your server, this kind of syntax should work:
````
mosquitto_pub -u *user* -P *password* -h mqtt.your.domain.tld -p 1883 -t 'domoticz/in' -m '{ "idx" : 1, "nvalue" : 0, "svalue" : "25.0" }'
````
In the same way:
````
mosquitto_sub -u *user* -P *password* -h mqtt.your.domain.tld -p 1883 -t 'domoticz/out'
````

If you wish to open direct mqtt protocol from an outside device, you'll need to:
- open port 1883 on Yunohost firewall (**Attention, security risk**)
- Allows IP addresses in mosquitto configuration for this listener
- Set the tls setting in mosquitto configuration by giving access to crt.pem and key.pem from your mqtt domain by setting respective certfile et keyfile variables. **This is mandatory to ensure a secure connection.**

#### Upgrade from version without mosquitto
If you have package 2020.2~ynh3 or below or if you have chosen to not set a domain during initial installation, mosquitto is not installed by default.
If you need to activate mosquitto in retrospect, do following actions:
1. Create a domain or a subdomain (for example : 'mqtt.your.domain.tld')
2. Connect to your server in command line 
3. Type following command : `yunohost app setting domoticz mqtt_domain -v mqtt.your.domain.tld`
4. Upgrade domoticz to last package.
If you're already on the last package version, use the following command : `yunohost app upgrade domoticz --force`

## Configuration

### Sensors, language and this kind of stuff
Main configuration of the app take place inside the app itself.

### Zwave management
If you're using zwave devices, install mosquitto along domoticz and give a try to [zwave-JS-UI package](https://github.com/YunoHost-Apps/zwave-js-ui_ynh).
Once installed, just follow instructions from the [wiki](https://www.domoticz.com/wiki/Zwave-JS-UI)

### Access and API
By default, access for the [JSON API](https://www.domoticz.com/wiki/Domoticz_API/JSON_URL's) is allowed on following path `/yourdomain.tld/api_/domoticzpath`.
So if you access domoticz via https://mydomainname.tld/domoticz, use the following webpath for the api : `/mydomainname.tld/api_/domoticz/json.htm?yourapicommand`

By default, only sensor updates and switch toogle are authorized. To authorized a new command, you have to manually update the nginx config file :
````
sudo nano /etc/nginx/conf.d/yourdomain.tld.d/api_domoticz.conf
````
Then edit the following block by adding the regex of the command you want to allow:
````
  #set the list of authorized json command here in regex format
  #you may retrieve the command from https://www.domoticz.com/wiki/Domoticz_API/JSON_URL's
  #By default, sensors updates and toggle switch are authorized
  if ( $args ~* type=command&param=udevice&idx=[0-9]*&nvalue=[0-9]*&svalue=.*$|type=command&param=switchlight&idx=[0-9]*&switchcmd=Toggle$) {
    set $api "1";
    }
````
For example, to add the json command to retrieve the status of a device (/json.htm?type=devices&rid=IDX),modify the line as this:
````
  if ( $args ~* type=command&param=udevice&idx=[0-9]*&nvalue=[0-9]*&svalue=.*$|type=command&param=switchlight&idx=[0-9]*&switchcmd=Toggle$|type=devices&rid=[0-9]* ) {
    set $api "1";
    }
````

All IPv4 addresses within the local network (192.168.0.0/24) and *all IPv6* addresses are authorized as API.
As far as I know, there is no way to filter for IPv6 address on local network : You may remove the authorization by removing or commenting this line in `/etc/nginx/conf.d/yourdomain.tld.d/domoticz.conf`:
````
allow ::/1;
````
This will authorized only IPv4 within local network to access your domoticz API.
You may add individual IPv6 address in the same way.

## Limitations

* Backup cannot be restored on a different machine type (arm, x86...) as compiled sources are different