Upon connection, and at any point during the connection, the Relay can send a `LIMITS` payload to the Client reflecting the current state of the user's rights in the relay.
```json
["LIMITS", { <limit_properties> }]
```
Where `limit_properties` includes properties that are specifically designed to change the way Clients communicate. Options are:
-`can_write: <true|false>`, If false, Clients MUST NOT publish events to the relay.
-`can_read: <true|false>`, If true, Clients MUST NOT send `REQ` commands to the relay.
-`required_tags: [ [ <key>, <value, optional> ], [ <key>, <value, optional> ] ]`, Clients MUST filter publishing events that don't include all listed tag names and values.
This payload SHOULD be cached in the Client's Relay connection object and updated as many times as the relay requests. Clients should use the information here to apply filters when sending events and `REQs` to the relay.