How to connect to MQTT broker for AWS IoT and AWS OTA simultaneously?

[kackle123]

I have a single K64 device and want to use both the MCUXpresso's SDK demo for an AWS IoT connection AND the demo for AWS OTA in one firmware.  I think I can merge these to share a single, secure, AWS, TCP/socket connection.  But does each then need its own unique MQTT connection to the broker, or can they share the MQTT connection (one democonfigCLIENT_IDENTIFIER within FreeRTOS' coreMQTT), too?  It looks like both want to manage the connection themselves.  I was wondering whether anyone had any experience with this.

[kackle123]

I am successfully using MCUXpresso's SDK's aws_shadow_enet demo.  I am trying to add to it this code: Manage SDK Components / Middleware / AWS IoT / AWS common libraries / AWS IoT demo ota_mqtt.  They seemed to have started adding the capability that I mentioned to "AWS IoT demo ota_mqtt", accessible via a boolean flag, but their code is incomplete. 

[RaRo]

Hello @kackle123,

Unfortunately, there is not much information about how to connect to MQTT broker for AWS IoT and AWS OTA simultaneously.

Nonetheless, the following information might be useful:

• AWS Documentation FreeRTOS User Guide. Specially the Integrating the OTA Agent into your application - FreeRTOS and,
• Getting Started with NXP FRDM-K64F User Guide in NXP/amazon-freertos github: amazon-freertos/doc/user_guide/Getting Started NXP FRDM-K64F Enet.pdf at feature/v1.4.7-nxp-support ....

Even though there is not much information about the K64F + AWS IoT or OTA, you could look for iMXRT10xx and RT117x information:

• AWS OTA Update on i.MX RT Platform Application Note and,
• iMXRT10xx and RT117x SDK AWS examples (there is one ota_demo_enet example).

Finally, here are some FreeRTOS information:

• OTA (Using OTA Agent Orchestrator) - FreeRTOS,
• IoT Libraries - FreeRTOS,
• Device Shadow MQTT topics - AWS IoT Core and,
• Over-the-air updates demo application - FreeRTOS.

Warm regards, Raul.

[kackle123]

Thank you for your research.  They don't seem to be what I'm looking for, but might give me some ideas.  I will continue to hack at the code to see how to combine them. 

[RaRo]

Hello @kackle123,

Could you please tell us which demos are you using? For example, which aws_example from the K64F SDK are you using? Which is the link to the demo for AWS OTA in one firmware?

There is not much information of the K64F AWS implementation. Nonetheless, here are some information that could be useful to look at:

• Designing MQTT Topics for AWS IoT Core - Designing MQTT Topics for AWS IoT Core
• Use AWS IoT Core MQTT broker with standard MQTT libraries | The Internet of Things on AWS – Official...

Warm regards, Raul.