Publishing MQTT data to multiple topics in Thingy91

[Adeel]

Hi Dev Team,

I am running a program that is publishing data over MQTT using a particular topic and broker on the Thingy91.

I wanted to know a way in which I could send different data to different topics and how it could be configured in the mqtt example.

For instance, I need to send different sensor values to different topics : (home/living/temp for temperature), (home/living/humid for humidity value).

I don't see an option of configuring more than 1 topic in the mqtt example. 

For now, I have defined it as : CONFIG_MQTT_PUB_TOPIC "home/living" in the autoconf.h file.

Could you let me know how to configure multiple topics in the program ?

Regards,

Adeel.

[Hakon]

Hello,

 

Could you let me know how to configure multiple topics in the program ?

 What do you mean by configure multiple topics? Do you mean publishing to multiple topics or subscribe to multiple topics?

[Adeel]

Hi Hakon,

I meant publishing to multiple topics .

Regards,

Adeel.

[Hakon]

What sample are you using? Are you using the AWS IoT library?

[Adeel]

Hi Hakon,

No, I am just building up my application on the mqtt_simple example. So basically the sample I am using is mqtt_simple.

Right now, I have 1 topic assigned and I am able to publish the data to that topic. I need to publish another data to a different topic as well. I wanted to know as to how I could do that.

Regards,

Adeel.

[Adeel]

Hi Hakon,

I found a way of doing this, though I am not sure its the most optimized way.

I duplicated the data_publish() function in the mqtt_simple , with a name : data_publish1() and configured it with a different topic : CONFIG_MQTT_PUB_TOPIC_1. I already updated this topic in the autoconf.h file.

I added this new function I created to the MQTT_EVT_PUBLISH event after the data_publish() function.

By doing this, I am able to publish different data to different topics now, although I think there can be an optimized method of doing this instead of creating new functions for different MQTT_topics. 

Could you let me know if there can be another method for doing this ?

Regards,

Adeel.