- **Broker URI**: the address of the broker, see [supported network protocols](#supported-network-protocols).

- **Client ID**: the name Pointcaster identifies itself with to the broker.

- **Auto Reconnect**: reconnect automatically if the connection to the broker drops.

- **Serialization Format**: how values that aren't plain numbers or strings are encoded, either JSON or MessagePack.

- **Serialize As Structures**: send bounding boxes as named fields instead of compact arrays. This is easier to read (e.g. in MQTT Explorer) but less efficient.

- **Send Retained**: mark messages as retained, so the broker holds the last value of each topic for new subscribers.

- **Empty Message Handling**: whether empty values are ignored, published once, or always published.