MQTT Message Log Extension

Logging Extension

Purpose: Logging
Version: 1.1.0    |   License: Apache V2
Provider: HiveMQ    |   Verified: yes

Prerequisites

Purpose

The HiveMQ MQTT Message Log Extension is a very useful HiveMQ Extension for debugging and development purposes. It provides the possibility to follow up on any clients communicating with the broker on the terminal.

The extension logs the following events:

Event Config Property Minimum Version
A client connects to HiveMQ client-connect 4.2 EE or 2020.1 CE
A client disconnects from HiveMQ client-disconnect 4.2 EE or 2020.1 CE
A client sends a publish message publish-received 4.2 EE or 2020.1 CE
A client sends a subscribe message subscribe-received 4.2 EE or 2020.1 CE
HiveMQ sends a publish message to a client publish-send 4.2 EE or 2020.1 CE
A client sends a unsubscribe message unsubscribe-received 4.3 EE or 2020.1 CE
A client send a ping request ping-request-received 4.3 EE or 2020.1 CE
A client completes a received Qos1 publish with a puback message puback-received 4.3 EE or 2020.1 CE
A client acknowledges the reception of a Qos2 publish with a pubrec message pubrec-received 4.3 EE or 2020.1 CE
A client completes a sent Qos2 publish with a pubrel message pubrel-received 4.3 EE or 2020.1 CE
A client completes a received Qos2 publish with a pubcomp message pubcomp-received 4.3 EE or 2020.1 CE
HiveMQ sends a connack message to a client connack-send 4.3 EE or 2020.1 CE
HiveMQ disconnects a client with a disconnect message client-disconnect 4.3 EE or 2020.1 CE
HiveMQ sends a suback message to a client suback-send 4.3 EE or 2020.1 CE
HiveMQ sends a unsuback message to a client unsuback-send 4.3 EE or 2020.1 CE
HiveMQ sends a ping response to a client ping-response-send 4.3 EE or 2020.1 CE
HiveMQ completes a received Qos1 publish with a puback message puback-send 4.3 EE or 2020.1 CE
HiveMQ acknowledges the reception of a Qos2 publish with a pubrec message pubrec-send 4.3 EE or 2020.1 CE
HiveMQ completes a sent Qos2 publish with a pubrel message pubrel-send 4.3 EE or 2020.1 CE
HiveMQ completes a received Qos2 publish with a pubcomp message pubcomp-send 4.3 EE or 2020.1 CE

Installation

  1. Download HiveMQ MQTT Message Log Extension
  2. Move the file: “hivemq-mqtt-message-log-extension-1.1.0.zip” to the directory: “HIVEMQ_HOME/extensions”
  3. Unzip the file.
  4. Start HiveMQ.

Configuration

By default, all MQTT events are logged. It is possible to opt out of specific log event types by adding a mqttMessageLog.properties files to your <HIVEMQ_HOME>/hivemq-mqtt-message-log-extension folder. There is an example file available which removes the logging of publish messages. Just rename it to mqttMessageLog.properties.

The events log only important information, if it’s required that MQTT messages are logging all information available the verbose property can be set to true. You can see the difference of a normal log versus a verbose log in the examples.

Note: use verbose=true very carefully as it will flood your log immediately.

Missing entries default to true. verbose defaults to false.

First Steps

Connect with an MQTT client of your choice. You should see a log message with its identifier, MQTT version, and all other connect options.

Examples

Verbose CONNECT message

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"17:26:23.602 INFO - Received CONNECT from client 'clientid': Protocol version: 'V_5', Clean Start: 'false',
Session Expiry Interval: '10000', Keep Alive: '20000', Maximum Packet Size: '40000',
Receive Maximum: '30000', Topic Alias Maximum: '50000', Request Problem Information: 'true',
Request Response Information: 'false',  Username: 'the username', Password: 'the password',
Auth Method: 'auth method', Auth Data (Base64): 'YXV0aCBkYXRh',
User Properties: [Name: 'name0', Value: 'value0'], [Name: 'name1', Value: 'value1'],
Will: { Topic: 'willtopic', Payload: 'payload', QoS: '1', Retained: 'false', Message Expiry Interval: '1234',
Duplicate Delivery: 'false', Correlation Data: 'data', Response Topic: 'response topic',
Content Type: 'content type', Payload Format Indicator: 'UTF_8', Subscription Identifiers: '[1, 2, 3, 4]',
User Properties: [Name: 'name0', Value: 'value0'], [Name: 'name1', Value: 'value1'],
[Name: 'name2', Value: 'value2'], Will Delay: '100' }"

Basic CONNECT message

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"17:26:23.602 INFO - Received CONNECT from client 'clientid': Protocol version: 'V_5', Clean Start: 'false', Session Expiry Interval: '10000'"

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