Runtime Updates via MQTT

All interactive DataView widgets can be updated live at runtime over MQTT downlink without restarting the device or re-allocating the DataView.

Authoritative Protocol Documentation

For complete payload specifications, JSON field definitions, action shortnames, and MsgList protocols, see Runtime Widget Updates ->.

Overview

Runtime updates use the app MQTT downlink topic envelope:

{
  "app": {
    "<dvname>": {
      "data": {
        "<widgetname>": <VALUE>
      },
      "actions": [
        {
          "a": "<ACTION_SHORTNAME>",
          "p": "<PARAMETER>"
        }
      ]
    }
  }
}

Key Capabilities

• Single / Multi Widget Updates: Modify text strings, numeric telemetry, colors, and graphics in real time.
• Interactive MsgList CRUD: Push alerts, update responder counts, and clear message lists.
• Dynamic Navigation: Switch InfoPages (gotoPage) or focus widgets (gotoWidget) on demand.