--- title: "MQTT Broker for Retail & E-commerce | ConnectMQ | ConnectMQ" description: "Connect POS terminals, self-checkouts, ESL, refrigeration and kiosks in every store to one managed MQTT broker — and push live order updates to your apps." url: "https://connectmq.com/industries/retail-ecommerce/" language: "en" --- ![](https://connectmq.com/images/industries/hero/retail-ecommerce.webp) # MQTT for connected stores and e-commerce POS lanes, self-checkouts, electronic shelf labels, refrigerated cases and in-store screens all produce events your head office rarely sees in time. Publish them to one private MQTT broker and let store ops, facilities and your order apps subscribe to what they need. [Try it free](https://app.connectmq.com/signup) [Use cases](#use-cases) No card required The challenge ## Hundreds of stores, thousands of devices, no live view 1. 01 ### Store devices in vendor silos POS, self-checkout, ESL base stations, scales, kiosks and refrigeration controllers each come with their own portal. Store ops logs into five tools to find out why a lane is down. 2. 02 ### Customers notice problems first A frozen self-checkout, an offline payment terminal or a freezer drifting warm overnight is usually found when a customer complains or stock is written off — not when it starts. 3. 03 ### Order and stock updates that lag Click-and-collect, ship-from-store and delivery apps depend on order status and stock moving in seconds. Polling the OMS from every app and store tablet is slow and costly at peak. Why ConnectMQ ## One event backbone for stores and digital channels ConnectMQ gives you a private MQTT broker that store gateways, devices and apps reach with standard MQTT — so IT can add a store, a device type or a new app without another integration project. - ### No broker to run in every store A managed, private broker instance reachable over TLS. Store gateways and devices connect outbound — no inbound ports on the store network and no broker cluster for your team to patch. - ### Credentials per store and vendor A username and password for every store gateway or vendor integration, with per-topic ACLs, so a refrigeration contractor sees its own cases and nothing of your POS lanes. - ### One topic tree for the whole estate Region, store, department and device in one namespace. Retained status gives a new dashboard every lane and case at once, and web and mobile apps subscribe over secure WebSockets. - ### Alerts before the store calls Threshold rules on case temperatures, terminal heartbeats and device status raise alerts and notifications, and Last Will flags a device the moment it drops off the network. Key use cases ## Key use cases in Retail & E-commerce Retailers usually start with one painful blind spot — offline payment terminals or warm freezers — then add store devices and live customer updates on the same broker. [ ### Smart Store Operations Refrigeration, HVAC, ESL, digital signage, people counters and self-checkouts from every store on one live feed Explore the use case](https://connectmq.com/use-cases/smart-store-operations/)[ ### ATM & POS Terminal Monitoring Device health, cash and paper levels, tamper events and remote config for ATM and POS terminal fleets Explore the use case](https://connectmq.com/use-cases/atm-pos-terminal-monitoring/)[ ### Real-Time Notifications Live order status, delivery tracking, alerts and in-app updates pushed to web and mobile apps over secure WebSockets Explore the use case](https://connectmq.com/use-cases/real-time-notifications/)[ ### Cold Chain Monitoring Temperature, door and location data from reefers, cold rooms and pharma shipments, with alerts on every excursion Explore the use case](https://connectmq.com/use-cases/cold-chain-monitoring/) Architecture ## From the store floor to your systems - POS lanes & self-checkouts - Payment terminals - ESL, shelves & kiosks - Refrigeration & HVAC **ConnectMQ**MQTT 3.1.1 · 5 · TLS - Store ops dashboard - OMS & inventory - Facilities & CMMS - Customer & staff apps Example topic namespace ``` retail/eu/store-0412/pos/lane-03/status (retained) retail/eu/store-0412/cold/case-07/temp retail/eu/store-0412/esl/base-02/status (retained) orders/ord-58213/status ``` Related solutions ## Solutions for Retail & E-commerce [ ### Connected Products & Smart Hardware Smart devices you ship to your own customers Learn more](https://connectmq.com/connected-products/)[ ### Fleet Telematics Vehicle tracking, telematics and cold chain Learn more](https://connectmq.com/fleet-logistics/)[ ### Connected Robots & Physical AI Robot fleets talking to fleet managers and AI pipelines Learn more](https://connectmq.com/robotics/) ## Retail & E-commerce: frequently asked questions How do I monitor POS terminals across all my stores with MQTT? Have each terminal or the store gateway publish a retained status to a topic such as retail/{region}/{store}/pos/{lane}/status, with a Last Will that marks it offline. Your store ops dashboard subscribes to retail/+/+/pos/+/status and sees every lane at once, and ConnectMQ rules can alert when a terminal goes silent. Is MQTT secure enough for retail store devices? MQTT over TLS with per-store or per-device credentials and per-topic ACLs is a solid foundation, and ConnectMQ provides all three. Keep cardholder data off the broker: publish device health, events and status, while payment processing stays in your payment stack and its compliance scope. Can I push live order updates to a web or mobile app over MQTT? Yes. Browsers and mobile apps connect to ConnectMQ over secure WebSockets and subscribe to the order or store topics they are allowed to read, so “ready for pickup” or a picking update arrives in seconds. Your OMS publishes each update once, instead of every app polling it. MQTT vs REST APIs for retail store systems: which should I use? Both. REST suits request-response work such as placing an order or looking up a price. MQTT suits events from many devices and live updates to many screens: devices publish on change, connections survive flaky store WAN links, and any number of systems can subscribe without the device knowing. ## Pilot connected stores on ConnectMQ Start on the Free plan — no card required. Connect one store’s devices and dashboards, then move to Basic or Scale when you go live. No overage charges, cancel anytime. [Get started](https://app.connectmq.com/signup) [See pricing](https://connectmq.com/pricing/) ## Other industries - [Manufacturing](https://connectmq.com/industries/manufacturing/) - [Automotive](https://connectmq.com/industries/automotive/) - [Oil & Gas](https://connectmq.com/industries/oil-gas/) - [Utilities](https://connectmq.com/industries/utilities/) - [Renewable Energy](https://connectmq.com/industries/renewable-energy/) - [Chemicals](https://connectmq.com/industries/chemicals/) - [Pharma & Life Sciences](https://connectmq.com/industries/pharma-life-sciences/) - [Food & Beverage](https://connectmq.com/industries/food-beverage/) - [Healthcare](https://connectmq.com/industries/healthcare/) - [Transportation & Logistics](https://connectmq.com/industries/transportation-logistics/) - [Telecom](https://connectmq.com/industries/telecom/) - [Financial Services](https://connectmq.com/industries/financial-services/) - [Agriculture](https://connectmq.com/industries/agriculture/) ## Articles [All articles](https://connectmq.com/blog/) Managed MQTT Cloud ### [How to Choose an IoT MQTT Broker: 12 Criteria and the Questions to Ask Your Vendor](https://connectmq.com/blog/how-to-choose-an-iot-mqtt-broker/) A practical 12-point checklist for choosing an IoT MQTT broker, a table of questions to ask every vendor, and a five-minute hands-on test you can run against broker.connectmq.com. September 21, 20269 min read Managed MQTT Cloud ### [What Is a Managed MQTT Broker? Benefits, Costs and How to Choose](https://connectmq.com/blog/managed-mqtt-broker/) A managed MQTT broker lets you run IoT messaging without operating servers, certificates or patches yourself. Compare managed and self-hosted, pick a deployment model and connect your first client in five minutes. September 1, 202610 min read Industrial IoT ### [Sparkplug B and the Unified Namespace: Structuring Industrial IoT Data on MQTT](https://connectmq.com/blog/mqtt-sparkplug-b-unified-namespace/) Sparkplug B gives industrial MQTT a strict session and payload model, while a Unified Namespace gives your plant data a single, readable home. Here is how they fit together, with topic design tips and live examples. August 26, 20269 min read