Non-standard MQTT options
Configure Non-Standard MQTT Options VerneMQ Supports.

Maximum Client Id Size

Set the maximum size for client ids, MQTT v3.1 specifies a limit of 23 characters.
max_client_id_size = 23
This option default to 23.

Persistent Client Expiration

This option allows persistent clients (those with clean_session set to false) to be removed if they do not reconnect within a certain time frame.
This is a non-standard option. As far as the MQTT specification is concerned, persistent clients are persisted forever.
The expiration period should be an integer followed by one of h, d, w, m, y for hour, day, week, month, and year; or never:
persistent_client_expiration = 1w
This option defaults to never.

Message Size Limit

Limit the maximum publish payload size in bytes that VerneMQ allows. Messages that exceed this size won't be accepted.
message_size_limit = 0
Defaults to 0, which means that all valid messages are accepted. MQTT specification imposes a maximum payload size of 268435455 bytes.
Last modified 30d ago