IPv6 addresses cannot connect

[Steve-Mcl]

Current Behavior

If user has specified !Pv6 address, WS (via MQTT.js) throws an error

Full details in MQTT.JS issue raised here: mqttjs/MQTT.js#1569

Expected Behavior

IPv6 addresses should connect

Steps To Reproduce

• Set broker config in flowforge.yml to use ::1 (or any other IPv6 address)
• Start FlowForge
• regenerate a device credentials, copy to device & run the agent

example yml section for project nodes MQTT Broker Configuration:

#################################################
# MQTT Broker Configuration                     #
#################################################

broker:
  ## Internal url used by the platform to connect to the broker
  url: mqtt://[::1]:9883
  ## External url used by devices to connect to the broker, if different
  public_url: ws://[::1]:9884

Environment

• FlowForge version: 1.x-git
• Node.js version: 16
• npm version: 8
• Platform/OS: Windows/Linux
• Browser:

[Steve-Mcl]

Verified locally.
Cannot test in staging - see comment: FlowFuse/nr-project-nodes#18 (comment)