How to export data from rules-engine to MQTT

[zhshih]

Hi everyone,
Currently, I am exploring edgeX-Napa in my project and I try to export data from rules-engine to MQTT broker.
The edgx services are launched in docker containers and the docker compose file is created by running make gen no-secty mqtt-broker via compose-builder. After services launched successfully, I modify a sink for MQTT server to tcp://127.0.0.1:1883 in the rule of rules-engine via webUI. However, error message "Stopped: found error when connecting for tcp://127.0.0.1:1883: io error: network Error : dial tcp 127.0.0.1:1883: connect: connection refused." is showed.
Can some please tell me how to fix this problem. Thank you very nuch.

[zhshih]

It turns out that it is the misconfiguration of MQTT server in the rule of the rules-engine. It should be set as tcp:://<hostname>:1883 where <hostname> is the value of hostname in mqtt-broker service in the docker-compose file.