Question about last will topic aws mqtt

Question

Hi all, 
 
 I'm using aws iot lib and last will topic feature, everuthing works but I have a question, in prj.conf I set my topic with 
 CONFIG_MQTT_HELPER_LAST_WILL_TOPIC="TOP/IMEI_NUMBER/ALIVE" 
 Is it possible to build this last will topic at runtime? For example if I want to deploy fota update, I don't want to create one bin for one thing, y idea is for example to store in flash my IMEI_NUMBEr and build at the runtime my last will topic, is it possible ? Maybe a function like set_last_will_topic(const char *last_will_topic) 
 
 My idea is update strcut mqtt_topi *will_topic in mqtt.h header use in mqtt-helper;c static int client_connect

Hieu · Accepted Answer

Hi simon884, 
 Refer to the implementation of the library here: 
 https://github.com/nrfconnect/sdk-nrf/blob/v3.1.0/subsys/net/lib/mqtt_helper/mqtt_helper.c#L470-L484 
 It doesn't seem like the library support changing the topic in runtime out of the box. However, it also looks like you could modify the library and add your own API to do that. 
 Hieu

Question about last will topic aws mqtt

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