IoTMarketi · Guides
What is MQTT? IoT Telemetry, QoS and Edge Usage
IoTMarketi Editorial
Industrial IoT guides
At a glance
MQTT is the publish/subscribe protocol that lets IoT devices send data efficiently to brokers or the cloud. This guide covers QoS, Last Will and edge patterns.
What is MQTT?
MQTT is a lightweight publish/subscribe protocol. Clients publish to topics via a broker. Header overhead is far lower than HTTP, which suits intermittent cellular links and large fleets.
Building blocks
- Publisher: Sensor or gateway
- Subscriber: Dashboard, rules engine, ERP bridge
- Broker: Mosquitto, HiveMQ, cloud IoT hubs
- Topic: e.g.
factory/line1/temp
QoS and Last Will
| QoS | Meaning |
|---|---|
| 0 | At most once |
| 1 | At least once |
| 2 | Exactly once |
Last Will notifies subscribers if a device drops unexpectedly — essential for asset tracking.
With the edge
Industrial routers or LoRaWAN gateways translate Modbus/LoRa into MQTT, buffer locally, then forward to the cloud.
Related: Edge computing for IoT · Protocol guide
Hardware
Browse the catalog and Teltonika for gateways and routers.
Takeaway
MQTT is not a radio — it is a messaging backbone. Choose the physical link separately.
Frequently Asked Questions
MQTT ne için kullanılır?
Sensör telemetrisi, komut kanalları, NB-IoT/LoRaWAN gateway çıktıları ve SCADA–bulut köprüleri için yaygın kullanılır.
QoS seviyeleri ne anlama gelir?
QoS 0 en fazla bir kez (fire-and-forget), QoS 1 en az bir kez, QoS 2 tam bir kez teslimat guvencesi sunar. Pil ve bant genişliği arttıkça maliyet artar.
