Ignition Perspective module in Raspberry PI 3 B+ with only 1GB RAM.
Raspberry PI run RaspAP and acts as WiFi access point to read all sensors by MQTT sparkplug.
All sensors equip with ESP-8266 to handle MQTT and WiFi connection.
Ignition acts as MQTT broker & client, Historian (PostgreSQL), HTML5 HMI server.
I use node red to get CPU, memory, … info of RPi and send those to Ignition via OPC UA.
Software packages:
Ignition Perspective,
Tag historian,
MQTT distribution,
MQTT Engine
RaspAP
PostgreSQL
Node Red
Performance: 25% Average CPU usage – 800 MB RAM Max usage
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