Mosquitto message persistence in broker level

[karthigai muthu]

Dear All,

How do we ensure the message persistence in broker level for example 2 days or even it can be a week
We tried to change some attributes in the mosquitto.conf file we changed the persistence property as true , persistence file name and its location also we have specified. but no use we haven't observed any changes
Typically when subscriber is not available to consume the messages it has to queue it in the location and when it comes back all the messages has to be pushed in the single shot.
Do we need to implement anything in the application level or we have to make some changes in the broker configuration level.

[Jan-Piet Mens]

> How do we ensure the message persistence in broker level for example 2 days
> or even it can be a week

A broker which supports persistence will keep the message in storage
(providing that is correctly configured) until the message is removed.

Removal of persitent messages is typically accomplished by publishing a
retained message with a NULL payload in it. Until then, the message is
retained by the broker.

-JP

[Nicholas Humfrey]

Hi,

The MQTT protocol does not specify anything about how long messages
should be persisted for - it is up to the individual implementation.

This list is for discussion of the MQTT protocol, not specific
implementations. You should have asked this on the mosquitto list over
at https://dev.eclipse.org/mailman/listinfo/mosquitto-dev


nick.

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[Kannadhasan]

We have changed the persistence property. Still we are not able persist the data when the subscriber is down.

# =================================================================

# Persistence

# =================================================================

# If persistence is enabled, save the in-memory database to disk 

# every autosave_interval seconds. If set to 0, the persistence 

# database will only be written when mosquitto exits.

# Note that writing of the persistence database can be forced by 

# sending mosquitto a SIGUSR1 signal.

#autosave_interval 1800

# Save persistent message data to disk (true/false).

# This saves information about all messages, including 

# subscriptions, currently in-flight messages and retained 

# messages.

# retained_persistence is a synonym for this option.

persistence true

# The filename to use for the persistent database, not including 

# the path.

persistence_file mosquitto.db

# Location for persistent database. Must include trailing /

# Default is an empty string (current directory).

# Set to /var/lib/mosquitto/ if running as a proper service.

persistence_location /var/lib/mosquitto/

[manoa...@gmail.com]

Thank you for your post
I have question
What is type of database? (sqlite or mysql)

[Omid Aghakhani]

What is database format?

[Kannadhasan]

Yes, we are able achieve the persistence with durable session in each client.