Update opcua-vs-mqtt.md

Author: sumitshinde-84

src/blog/2026/01/opcua-vs-mqtt.md

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 The question is broken.
 
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 MQTT moves messages. OPC UA defines meaning. They operate at different layers of the stack. Comparing them is like comparing TCP to JSON.
 
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 Yet the debate persists. Vendors position them as competitors. Consultants bill by the complexity. Your procurement department demands a choice.
 
 The industry knows better. OPC UA includes MQTT in its spec. Real factories use both: MQTT for telemetry, OPC UA for machine coordination. The technologies already converged.