Web Server With Live Data plugin for Data Loggers

Latest version: 5.0.1 build 1126. November 28, 2025.

The Web Server plugin embeds a fast and lightweight HTTP/HTTPS server inside our data loggers. It does not require 3rd-party web software. The plugin receives parsed data and outputs it to configurable dashboards for multiple remote users. It aggregates data from multiple sources and renders numeric widgets, gauges, charts, lists, and tables with configurable options.

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How it works and when to use it

Install this plugin when you need remote access to live or historical logger data without running IIS or Apache. The server listens on a configurable port (default 80 for HTTP and 443 for HTTPS). The plugin generates web pages using predefined templates. Use it for dashboards with live data accessible across a LAN or the Internet.

Widgets and page elements

After creating a page tab (Add page), add widgets (Add widget) to compose a dashboard. Widgets can be rearranged or removed by dragging them to the Drop widget area. To edit, hover over the widget, open the menu via the "..." control, and choose Edit.

Text - static or formatted text with configurable font size.
Numeric - displays a numeric value and a horizontal gauge bar.
Gauge - radial gauge with 180 or 360 degree options.
Gauge (advanced) - multiple gauge types with warning and alarm limits.
Chart - line or area charts. Charts support up to 100 data points; many charts increase CPU usage.
List - grouped values shown together for quick comparison.
Table - history view that holds up to 1000 values for a selected variable.

Practical examples

Example 1: Single sensor numeric widget with temperature measurements. Configure the "Numeric" widget to show the current value and a horizontal gauge. The dashboard displays the latest value and color codes if thresholds are exceeded.

Example 2: Combined dashboard to aggregate values from three sensors into one page. Add three widgets for different values. For example, "Gauge" for pressure, "Chart" in the middle for temperature history, and "Table" for the last 500 humidity samples.

Integration examples with Advanced Serial Data Logger

Incoming serial data example (sample raw line):

2025-01-02 08:00:00, SENSOR01, TEMP, 23.7
2025-01-02 08:00:00, SENSOR02, PRESS, 101.3
2025-01-02 08:00:00, SENSOR03, HUM, 45.2

Parser variables accessible on a dashboard:

DATE_TIME_STAMP = "2025-01-02 08:00:00"
SensorId = "SENSOR01"
Variable = "TEMP"
Value = "23.7"

As a result, the parsed value from the "Value" variable will immediately appear on a dashboard (see the example below).

Key features

Embedded HTTP/HTTPS server with configurable ports.
Templated web pages that can aggregate multiple data sources.
Custom dashboards with widgets: text, numeric, gauge, chart, list, table.
User dashboards with password-protected access.
Support for SSL certificates and self-signed certificates for local use.
Up to 100 data points per chart and up to 1000 values per table for history display.

Summary

The Web Server plugin provides a compact web server with template for live and historical data access for our data loggers. It simplifies remote access to dashboards with live received data.