Question 1

How to set up CODESYS-MQTT with TLS encryption?

Accepted Answer

Enable TLS in the client configuration without needing certificates; the library includes example projects for Windows and RaspberryPi using test.mosquitto.org to demonstrate secure connections.

Question 2

Can CODESYS-MQTT handle high-throughput messages for industrial sensors?

Accepted Answer

Yes, it's optimized for performance, handling 50 QoS 0 packets per cycle in default settings, with tests showing nearly 600 sends/receives per second in split payload scenarios, as noted in the NEWS section.

Question 3

CODESYS-MQTT vs other MQTT libraries for CODESYS: which is better?

Accepted Answer

CODESYS-MQTT excels in seamless integration with CODESYS through callbacks and function blocks, but alternatives might offer better documentation or thread safety, so evaluate based on project needs like performance vs. ease of use.

Question 4

How to use callbacks in CODESYS-MQTT for dynamic subscriptions?

Accepted Answer

Set up callbacks in subscription function blocks to handle received messages; the TestMQTTGithubInterfaceExampleTopicAndPayload examples demonstrate this event-driven approach for flexible topic handling.

Question 5

What are the limitations of CODESYS-MQTT in multi-threaded apps?

Accepted Answer

Since the client is not thread-safe, avoid using it in applications requiring concurrent access from multiple threads within CODESYS, as this could lead to data corruption or instability.

Question 6

How to publish JSON data with CODESYS-MQTT?

Accepted Answer

For JSON support, use the separate CODESYS-zigbee2mqtt library linked in the README, which integrates with CODESYS-MQTT to simplify JSON handling for IoT workflows.

CODESYS-MQTT

What is CODESYS-MQTT?

Overview

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Frequently Asked Questions