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Multi-station geotechnical monitoring with remote OTA

A fleet of identical Ethernet stations with 0-4 alert classification, integration with the official platform and maintenance without field visits.

Runs on: Server (Node-RED) — Python 3 scripts (Linux PLC).

The application

Slope monitoring required several measuring stations on a hillside with difficult access. Four identical ESP32 PLC Ethernet units (only the ID and IP change) expose their status over HTTP and accept new firmware via OTA; a Node-RED concentrator polls them, classifies the alert level 0-4 (a silent station is itself an alarm), sends the data to the official platform via FTP in the required format and raises email notifications on incidents.

Architecture

• 4× ESP32 PLC Ethernet station with GET /status (JSON) and POST /update (OTA)
• Periodic push from each station to the concentrator (silence watchdog)
• Node-RED: 0-4 alert classification + multi-station dashboard
• Generation of the standardized file and FTP upload to the official platform
• SMTP alerts on reboots or critical levels

Bill of materials

• Server (Node-RED) — Industrial Shields controller
• Geotechnical sensors (tilt/detection) — per station
• Raspberry Pi concentrator + switch — Node-RED, FTP, email

What is in the pack

• email-alerts-smtp-gmail.py
• ftp-data-upload-platform.py
• multi-station-dashboard-node-red.js
• polling-alert-classification-node-red.js
• webserver-status-ota-ethernet.ino
• Bill of materials + README