sub - Man Page
subscribe to MQTT topics
sub connects to the given MQTT broker and subscribes to all topics specified. Messages received on a topic are printed to stdout, prefixed with the topic the message was received on.
All options can be passed either as command-line arguments or can be specified in a simple config file.
- -broker URL
broker address (should be in the form of a URL)
- -ca-root FILE
path to a FILE containing CA certificates (optional)
- -cert-file FILE
authenticate with a certificate
discard any pending messages from the broker (default true)
- -client-id STRING
unique identifier for this client (defaults to a semi-random string)
- -config FILE
path to FILE containing configuration values (optional)
- -header KEY=VALUE
set an HTTP header (in KEY=VALUE form) (can be specified multiple times)
- -key-file FILE
authenticate with a private key
- -password STRING
authenticate with a password
- -qos INTEGER
quality of service for messages
- -topic STRING
topic to publish or subscribe to (can be specified multiple times)
- -username STRING
authenticate with a username
Any option may be specified as a value in a configuration file instead of (or in addition to) a command-line option. Values present on the command-line take precedent over values in the configration file. Thus it is easy to create a base configration file that can be augmented easily at run time.
The configuration file takes the form of a simple space-separated "option value" format (i.e. "broker tcp://test.mosquitto.org:1883").
Connect to a broker anonymously and subscribe to two topics.
sub -broker tcp://test.mosquitto.org:1883 -topic mqttcli/pubtest -topic mqttcli/pubtest1
Connect to a broker using username/password authentication and subscribe to a topic.
sub -broker tcp://test.mosquitto.org:1884 -username ro -password readonly -topic mqttcli/pubtest
Link Dupont <email@example.com>