I have been trying to make a simple MQTT pub sub communication on my device using node-red. I have published and subscribed to the topic: telemetry. the server and port used are : mqtt.bosch-iot-hub.com:8883 . For the TLS configuration, the iot hub certificate provided by bosch is being used(https://docs.bosch-iot-hub.com/cert/iothub.crt). I am able to successfully publish the data on the topic and receive it using a HONO receiver. But when I directly subscribe to that topic using node-red mqtt-in node or mosquitto_sub, it doesn't receive the data.
Can someone please help me understand why is it happening and what could be the possible solution to it?
There is no point in devices subscribing to the
telemetrytopic. In Hono (and thus the Bosch IoT Hub) devices only publish telemetry data and/or events. Such data is consumed by downstream applications using Hono's north bound, AMQP 1.0 based Telemetry and Event APIs. Applications can use Hono's AMQP 1.0 based Command & Control API to send commands to (connected) devices. In order to receive commands, MQTT based devices need to subscribe to thecommandtopic.