HTTP GET, POST, InfluxDB data export plugin for Data Loggers

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

Exporting using HTTP POST/GET

The HTTP POST export supports application/x-www-form-urlencoded by default and optionally application/json, application/soap, text/plain, or application/binary. You can create a prebuilt body using HTTP_DATA or HTTP_DATA_RAW parser variables. HTTP_DATA is UTF-8 encoded and escaped; HTTP_DATA_RAW is sent as-is. When not using a raw body, the plugin composes the payload from listed parameters or, if the list is empty, from all available parser variables. You can include placeholders for parser variable like {PARSER_VALUE} in the URL. The plugin will replace them with the corresponding parser value before sending.

HTTP GET is similar to POST but limited to 1024 bytes. If a data packet contains HTTP_DATA it will be URL encoded and appended to the request URL; HTTP_DATA_RAW will be appended without encoding. If both special variables are omited in a data packet, the plugin appends other parser variables to the URL. GET is useful for quick or legacy webhooks.

Exporting to InfluxDB

The InfluxDB export module enables our data loggers to publish time series data directly to InfluxDB using the database HTTP API. It supports writing points with tags, fields, and timestamps. The module automatically converts parser variables into InfluxDB data points. It can also buffer data locally when the server is unavailable so no data is lost during transient outages.

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Practical examples

Assume a parsed data packet with variables:

DATE_TIME_STAMP = "2025-01-02 08:00:00"
SENSOR_ID = "S-100"
LOCATION = "plantA"
TEMPERATURE = 72.35
PRESSURE = 101325

InfluxDB

The plugin will produce an HTTP POST request body according to the InfluxDB specification.

HTTP POST

Sample POST body when using form encoding (conceptual):

measurement=sensor_readings
&device=S-100
&site=plantA
&temp=72.35
&pressure=101325
&timestamp=2025-01-02 08:00:00

Exported data example (JSON via HTTP_DATA_RAW)

HTTP_DATA_RAW = '{"measurement":"sensor_readings","tags":{"device":"S-100","site":"plantA"},"fields":{"temp":72.35,"pressure":101325},"time":"2025-01-02 08:00:00"}'

Key features

Direct write to InfluxDB via HTTP API with tag, field, and timestamp mapping.
Supports HTTP POST and GET exports, custom encodings, and raw payloads (HTTP_DATA_RAW).
OAuth2 token retrieval, automatic refresh, and usage in Authorization: Bearer header.
Local temporary file backup and restore to prevent data loss.
Custom headers, API key option, and flexible request composition including JSON/XML.

Summary

The HTTP/InfluxDB export plugin provides reliable export over HTTP. It converts parser variables into typed tags and fields, supports JSON and other encodings in the request body, and OAuth2. It can create temporary local copies of data in case of connectivity issues.