Hi Wenjie Cui! I want to implement communication between B&R PLC (client) and MQTT broker, but the library paho.mqtt.c-ar you mentioned is not available. Could you please share an example program to send messages to MQTT broker using this library?

The library is available in the archive: [image] GitHub - archive-br-automation-com/paho.mqtt.c-ar: MQTT Client for Automation Runtime based on... MQTT Client for Automation Runtime based on eclipse/paho.mqtt.c Please see this post for more info: …

Thank you so much! This is exactly what I was looking for! Very useful!

Dear All, As I have tried to used this library in my project but not able to connect with my cloud. It is showing an error of -10005. So anybody can help how to resolve this issue. Thanks In Advance. Shrenik

Hi, i’ve no experience with that library, but having a look into the constants definition I see that error -10005 means “connection failed”. So I would recommend to check your PLCs IP settings, if the broker is reachable. Especially check, if DNS is activated (if using a hostname), if the default…

Please note that if you are using the certificate store you could hit a bug in the AS6/AR6 of the library. AS6/AR6: Own Certificates aren’t loading when placed in the certificates store · Issue #41 · br-automation-community/paho.mqtt.c-ar . You can use the workaround of placing the certificates in th…

Mqtt client example for br plc, link to sample

Ask Questions B&R Software & Runtime

tommi.piiparinen (Tommi Piiparinen) June 13, 2025, 11:22am 2

The library is available in the archive:

Please see this post for more info:

Topic		Replies	Views
MQTT Broker Implementation Programming	8	2060	March 28, 2024
Https://github.com/br-automation-com/paho.mqtt.c-ar for AS6 Programming library	14	1263	April 28, 2026
Can't connect to AWS IoT Core via MQTT with a PLC Controls & Vision plc	4	367	October 10, 2024
MTConnect communication with B&R controller Programming library , unsolved	1	143	August 8, 2025
Modbus TCP Connect with IPC B&R - "Library AsMbTcp" Programming modbus	2	138	May 30, 2026

Mqtt client example for br plc, link to sample

Related topics