I want to set a MQTT Topic for AWS IOT in Runtime with the new SDK 2.7.0.
My Legacy code that works in 2.0.0
static int awsTopicSubscribe(void) {
int err;
err = awsCpuIdSave(bufClientId_2, sizeof(bufClientId_2));
if (err) {
LOG_ERR("[MODEM] Client ID Error, error: %d", err);
}
// LOG_INF("client_id1: %s", bufClientId_2);
static char custom_topic[75];
static char custom_topic_2[75];
sprintf(custom_topic, "$aws/things/%s/shadow/get/accepted2", bufClientId_2);
sprintf(custom_topic_2, "$aws/things/%s/shadow/update/accepted2", bufClientId_2);
const struct aws_iot_topic_data topics_list[2] = {[0].str = custom_topic,
[0].len = strlen(custom_topic),
[1].str = custom_topic_2,
[1].len = strlen(custom_topic_2)};
err = aws_iot_subscription_topics_add(topics_list, ARRAY_SIZE(topics_list));
if (err) {
LOG_ERR("[AWS] aws_iot_subscription_topics_add, error: %d", err);
}
return err;
}
The new approach seems to be:
https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/libraries/networking/aws_iot.html
My Code:
static int awsTopicSubscribe(void) {
int err;
err = awsCpuIdSave(bufClientId_2, sizeof(bufClientId_2));
if (err) {
LOG_ERR("[MODEM] Client ID Error, error: %d", err);
}
// LOG_INF("client_id1: %s", bufClientId_2);
static uint8_t custom_topic[75];
static uint8_t custom_topic_2[75];
sprintf(custom_topic, "$aws/things/%s/shadow/get/accepted2", bufClientId_2);
sprintf(custom_topic_2, "$aws/things/%s/shadow/update/accepted2", bufClientId_2);
static const struct mqtt_topic topic_list[] = {
{
.topic.utf8 = custom_topic,
.topic.size = strlen(custom_topic),
.qos = MQTT_QOS_1_AT_LEAST_ONCE,
},
{
.topic.utf8 = custom_topic_2,
.topic.size = strlen(custom_topic_2),
.qos = MQTT_QOS_1_AT_LEAST_ONCE,
}};
err = aws_iot_application_topics_set(topic_list, ARRAY_SIZE(topic_list));
if (err) {
LOG_ERR("aws_iot_application_topics_set, error: %d", err);
}
return err;
}The compiler Errors:
C:/WSL/epaper-nrf-firmware/src/main.c:719:27: error: initializer element is not constant
719 | .topic.size = strlen(custom_topic),
| ^~~~~~
C:/WSL/epaper-nrf-firmware/src/main.c:724:27: error: initializer element is not constant
724 | .topic.size = strlen(custom_topic_2),
|
So do I missunderstand something or is there no way anymore to set a dynamic topic in runtime? So only predefined topics will work?
Best regards
