Enable Device Writes from Ignition

Prerequisites:

• Installing the Java Runtime Environment
• Installing Ignition
• Installing the following MQTT Modules
  • MQTT Distributor
    • v1.7.1 or greater if using Ignition 7.7.X
    • v1.8.1 or greater if using Ignition 7.8.X
    • v3.1.0 or greater if using Ignition 7.9.X
  • MQTT Engine
    • v1.7.3 or greater if using Ignition 7.7.X
    • v1.8.3 or greater if using Ignition 7.8.X
    • v3.1.0 or greater if using Ignition 7.9.X

Overview:

MQTT Engine by default blocks the ability to write to MQTT device tags.  This is to prevent accidental writes when running on production systems.  When developing it must be explicitly enabled in the gateway configuration.  This tutorial outlines that process.

Enable Device Writes from Ignition:

Start by browsing to your Ignition Gateway's web UI and select 'Configure'.  The default URL is:  http://127.0.0.1:8088

The default username / password when clicking 'Configure' is admin / password.  Once in the Configuration menu select 'MQTT ENGINE -> Settings' on the left navigation bar.

Once there, you'll see the following under the 'Advanced' tab.  The last option is a checkbox denoting whether or not to block outbound commands.  Make sure this is unchecked and click 'Save Changes'