mqtt_check.py

Check MQTT login credentials for a target (MQTT broker's hostname)

$ mqtt_check.py [domain]/[username]:[password]@[targetName]

$ mqtt_check.py -client-id [client_id] [domain]/[username]:[password]@[targetName]

$ mqtt_check.py -ssl [domain]/[username]:[password]@[targetName]

$ mqtt_check.py -port [port] [domain]/[username]:[password]@[targetName]

$ mqtt_check.py -debug [domain]/[username]:[password]@[targetName]

$ mqtt_check.py --help

mqtt_check.py [options]

-H, --host
    Specify the MQTT broker hostname or IP address to connect to.

-P, --port
    Specify the MQTT broker port. Common ports are 1883 (plain) or 8883 (SSL).

-u, --username
    Provide a username for MQTT authentication if required by the broker.

-p, --password
    Provide a password for MQTT authentication. Use caution when passing passwords directly.

--ssl
    Enable TLS/SSL secure connection to the broker.

--cafile
    Specify the CA certificate file for SSL validation.

-t, --timeout
    Set a timeout in seconds for the connection or specific check operation.

-v, --verbose
    Enable verbose output for debugging purposes.

-h, --help
    Show a help message describing the script's usage and options.

The mqtt_check.py script is a non-standard utility typically used to verify the operational status of an MQTT broker.
It connects to a specified MQTT broker (hostname and port), and depending on its implementation, may perform various checks such as establishing a connection, publishing a test message, subscribing to a topic, or checking authentication credentials.
This script is commonly employed in monitoring systems (like Nagios, Zabbix, Icinga) or as a simple command-line tool for basic network and service troubleshooting of MQTT infrastructure.
Its primary goal is to return an exit code that indicates the health of the broker (e.g., 0 for OK, non-zero for problems). The exact functionality and available options are entirely dependent on the specific version or implementation of the script being used, as it is not a built-in Linux command but usually a custom or third-party Python script.

mqtt_check.py is not a standard Linux command. Its presence, location, options, and behavior depend entirely on how it was installed or created. It typically requires Python and an MQTT client library (like paho-mqtt) to be installed.

As a monitoring check, the script is designed to return standardized exit codes:
0: OK (Broker is healthy)
1: Warning (Minor issue)
2: Critical (Major issue or unreachable)
3: Unknown (Script error or unhandled state)

Relies on a functional Python interpreter and typically requires an MQTT client library, most commonly paho-mqtt, installed within the Python environment.

This command is typically a custom script developed to meet the specific needs of monitoring MQTT brokers within a particular environment or project. Its history is intertwined with the growth of the MQTT protocol and the increasing need for automated service checks in distributed systems and IoT contexts.

ping(8), nc(1), mosquitto_pub(1), mosquitto_sub(1), python(1)