How to choose a brownfield IIoT platform for many sites: 10 criteria to check before you buy

• It connects to the equipment you already have over the open protocols it already speaks (BACnet, Modbus, OPC UA, SNMP, MQTT, HTTP/REST), without changing firmware, controllers or programming
• It reads equipment from different manufacturers and eras on the same gateway, and has a way in for equipment that was never instrumented
• It doesn't lose readings when the Internet drops at a site: the gateway stores them and resends them on reconnect
• It maps the data to a common model, so the same type of equipment can be compared across sites even when the brands differ
• It correlates signals across systems, such as energy, HVAC, backup power and security, instead of showing each device on its own
• It detects anomalies and alerts through the channels your team already uses, with reports by role and audit-ready traceability
• It can act on equipment that supports it, logging every action, and it can also run read only when the risk justifies it
• It scales to many sites: gateways provisioned without a site visit and signed firmware rolled out in stages or fleet-wide
• The data stays yours and is available to your own dashboards, reports and systems through APIs
• It is sized with a clear unit and spells out what the upfront fee covers and what the monthly fee covers

Ask the vendor to answer each criterion with an example in production, not a feature list. If an answer depends on custom development at every site, count it as integration cost.

1. 1Inventory. List, site by site, which equipment you have, its brand and era, and which port or protocol each device exposes; equipment with no data output counts too.
2. 2Prioritize. Decide which decisions you want the data to drive, such as failures, energy, backup power or compliance, and which equipment feeds them; that sets the scope, not the full asset list.
3. 3Size. Count the data sources you will connect. At GSS Analytix each piece of equipment or data source connected to the gateway is a primary connection, the unit used to size and price the project.
4. 4Pilot. Start with a limited-scope pilot at a representative site and measure whether the platform catches in time what your team finds out late or on site today.
5. 5Scale. Before rolling out to every site, check how gateways are provisioned, how their firmware is updated and who maintains the connectors when a piece of equipment changes.

A generic gateway translates data from one protocol to another. It works for one site or a pilot, but mapping every device, the local queue, the common model, dashboards, alerts and fleet management are left to your team.

A complete brownfield platform includes on-site capture and cloud intelligence. At GSS Analytix they are two products built and operated by the same company: Phantom Shield, the edge gateway, physical or virtual, and Reveal, the platform that normalizes, analyzes, correlates and acts on that data.

Phantom Shield speaks BACnet, Modbus, OPC UA, SNMP, MQTT and HTTP/REST in one device and stores and forwards readings with a configurable buffer. It uses zero-touch provisioning, receives signed firmware in stages or fleet-wide and, in sensitive contexts such as CCTV, is deployed read only by choice.

Reveal maps every signal to a common semantic layer (Brick), detects anomalies, analyzes root cause, correlates systems and sites, alerts by WhatsApp, email or ticketing and delivers reports by role with full traceability. The data is owned by the customer, and every project is priced by primary connection, with a one-time fee for equipment, installation and onboarding plus a monthly service fee.

For many older devices, the gateway is their first digital touchpoint. Where a direct connection is not possible or cost-effective, the cameras already installed can read meters, levels and indicators, and where wiring is hard, Modbus-to-LoRaWAN converters carry the readings wirelessly.

Read: CCTV beyond security

• You have a single site or a pilot with few devices and one or two protocols, and your team already has a data platform and people to maintain connectors, dashboards and alerts
• You only need to move data into a system that already exists: a generic gateway can be enough for that
• You are looking for plant process control, such as control loops, sequences or operator screens: your SCADA, BMS and PLCs keep doing that
• You are replacing all your equipment with new devices that come connected: then your problem is not brownfield

If you run dozens of sites with equipment from different brands and eras, and today you find out about failures late or on site, that is where a brownfield platform saves a per-site integration project.

• Data acquisition from existing equipment
• Phantom Shield: the gateway
• Phantom Shield vs. a generic IoT gateway
• Reveal platform
• Monitoring on top of the BMS you already have
• A SCADA alternative for multisite monitoring
• One dashboard for every site
• AI agents for physical infrastructure
• Generator, UPS and battery monitoring
• GSS Analytix FAQ