IoTMarketi · Guides
What is MQTT? IoT Telemetry, QoS and Edge Usage
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.
FAQ
Frequently Asked Questions
MQTT ne i�in kullanilir?
Sens�r telemetrisi, komut kanallari, NB-IoT/LoRaWAN gateway �iktilari ve SCADA�bulut k�pr�leri i�in yaygin kullanilir.
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 genisligi arttik�a maliyet artar.
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