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Configure Non-Standard MQTT Options VerneMQ Supports.

Non-standard MQTT options

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.

{% hint style="warning" %} This is a non-standard option. As far as the MQTT specification is concerned, persistent clients are persisted forever. {% endhint %}

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.