Introduction: Why OPC UA Became the "Standard Language" of the Industrial Internet Era Industry 4.0 and the Industrial Internet of Things connect automation systems that previously exchanged data through separate vendor interfaces. Integration requires more than moving bytes: applications need to agree on data meaning, update behavior and security. OPC UA (Open Platform Communications Unified Architecture) addresses this through a platform-independent architecture with an inf

A remote pump can send a temperature value to a maintenance dashboard without giving the dashboard direct access to its PLC. MQTT is one way to move that value: a client publishes a message to a broker, and authorized subscribers receive messages on matching topics. The protocol does not define what a pump value means, read a Modbus register on its own or make a cellular link reliable. Before choosing MQTT settings, identify the source of each data point, the publisher, the b

Introduction: Why Is Modbus Still Widely Used? Modbus has been used in industrial communication since Modicon introduced it in 1979. Its request/response model remains useful for reading measurements, device status and control registers in energy, water, process industries and manufacturing. Its continued use is best explained by installed equipment, accessible specifications and straightforward implementation, rather than by unsupported market-share or device-count estimates