Understanding of MQTT for IoT Projects
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- It uses a small amount of bandwidth compared to traditional HTTP, and allows for bi-directional communication between clients and servers using publish/subscribe messaging.
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Understanding of MQTT for IoT Projects
- 1. MQTT
- 2. IoT Internet of Things - IoT is the inter-networking of physical devices. - Also, call it as "connected devices" and "smart devices" Areas: - Home automation/Smart home - Industrial automation - Health monitoring devices ..etc
- 4. Protocols using in IoT : - MQTT (Message Queue Telemetry Transport) - HTTP (Hypertext Transfer Protocol) - CoAP (Constrained Application Protocol) ...etc
- 5. MQTT ( Message Queuing Telemetry Transport ) - MQTT is a publish/subscribe messaging machine-to- machine (M2M)/"Internet of Things" connectivity protocol - It was originally developed by IBM and is now an open standard. - Uses port 1883 and 8883 (over SSL).
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- 8. TOPICS: Example 1: Publish: “company/name/vinay” Data/Payload : {“phone”:”1234567890”} Subscriber: “company/name/vinay” Example 2: Single level Wildcard: + Subscriber: “company/+/vinay” Example 3: Multi level Wildcard: # Subscriber: “company/#”
- 9. Quality Of Service (QoS): QoS 0: The client/server will deliver the message once, with no confirmation required. QoS 1: The client/server will deliver the message at least once, confirmation required. QoS 2: The client/server will deliver the message exactly once, confirmation required.
- 10. MQTT Libraries: (Device/ Client) - Paho Mqtt - Mosquitto - MQTT.js ...etc
- 11. MQTT Broker Cloud Environment : - IBM Bluemix Watson IoT - eMQTT (erlang MQTT): Open source
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