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Establishes a connection to an MQTT broker. When the connection is successfully established, the connect event is triggered.
Signature
JavaScript
client.connect(url, options)
Parameters
Parameter
Type
Description
url
string
Broker URL (for example, mqtt://broker.emqx.io:1883)
options
object
Optional connection configuration
options.keepalive
number
Keep-alive interval in seconds (default: 60)
options.connect_timeout
number
Connection timeout in milliseconds (default: 30000)
options.clean_session
boolean
Whether to start with a clean session (default: true)
options.servers
string[]
Array of broker URLs for failover
options.tags
object
Custom tags for metrics (key-value pairs)
Supported broker URL schemas
Schema
Description
mqtt://
Plain TCP connection (no encryption)
mqtts://
Secure connection over SSL/TLS
tcp://
Alias for mqtt://
ssl://
Alias for mqtts://
tls://
Alias for mqtts://
ws://
MQTT over WebSocket
wss://
MQTT over secure WebSocket
If the schema is omitted, mqtt:// is used as the default.
SSL/TLS configuration
The extension uses standard
k6 TLS configuration for all SSL/TLS settings. Configure certificates, verification, and other TLS-related options using k6’s environment variables and configuration files.
