Difference between revisions of "Mqtt notes"
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Summary of callback pointers for 'set flag' events: | Summary of callback pointers for 'set flag' events: | ||
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| + | Appears to come from `./nrf/subsys/net/lib/aws_iot/src/aws_iot.c:1168: LOG_ERR("Application subscription list count mismatch");` | ||
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Revision as of 07:20, 15 December 2021
Notes on MQTT
Looks like in Nordic Semi's aws_iot sample app, the following enumerated events represent a firmware instance receiving subscribed messages from an MQTT broker:
- 1108 DEV - aws_iot event handler called, AWS_IOT_EVT_READY - 1108 DEV - aws_iot event handler called, AWS_IOT_EVT_DATA_RECEIVED
s3://iot-poc/hello/world/
Ah, trouble when attempting to add MQTT topics:
*** Booting Zephyr OS build v2.6.0-rc1-ncs1 *** I: Modem library is not yet initialized, AT commands not sent I: Configuration of MAGPIO and COEX0 is left to drivers The AWS IoT sample started, version: v1.0.0 ZZZ ZZZ ZZZ ZZZ - preparing to subscribe to hello/world topic, ZZZ ZZZ ZZZ - calling routine to subscribe to MQTT topics . . . ZZZ E: Application subscription list count mismatch aws_iot_subscription_topics_add, error: -122 ZZZ ZZZ ZZZ ZZZ Adding application specific topics failed, error: -122 Summary of callback pointers for 'set flag' events:
Appears to come from `./nrf/subsys/net/lib/aws_iot/src/aws_iot.c:1168: LOG_ERR("Application subscription list count mismatch");`
A link to review:
2021-12-14 Tue
- https://forums.aws.amazon.com/index.jspa
- https://aws.amazon.com/blogs/iot/getting-started-mqtt-retained-messages-aws-iot-core/
- https://docs.aws.amazon.com/iot/latest/developerguide/mqtt.html#mqtt-retain
2021-12-08
* https://github.com/aws/aws-iot-device-sdk-embedded-C/blob/main/demos/mqtt/mqtt_demo_basic_tls/mqtt_demo_basic_tls.c
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* https://docs.aws.amazon.com/iot/latest/developerguide/topics.html
Unsorted references to MQTT:
# https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/samples/net/mqtt_publisher/README.html # https://www.hivemq.com/blog/mqtt-essentials-part2-publish-subscribe/ # https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/samples/index.html # https://www.circuito.io/blog/arduino-code/ # https://www.hivemq.com/blog/mqtt-essentials-part-7-persistent-session-queuing-messages/ # https://www.hivemq.com/blog/mqtt-essentials-part-3-client-broker-connection-establishment/
# https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.6.1/nrf/examples.html # https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.6.1/nrf/ug_tfm.html#ug-tfm # https://ci-builds.trustedfirmware.org/static-files/UxIoKYsDyPQ0ojvJOv9EX6-hZNDZd6IPGfcm05Bk1b0xNjM3MTA4NjMxODUxOjk6YW5vbnltb3VzOmpvYi90Zi1tLWJ1aWxkLWRvY3MtbmlnaHRseS9sYXN0U3RhYmxlQnVpbGQvYXJ0aWZhY3Q=/trusted-firmware-m/build/docs/user_guide/html/index.html
Nordic AWS FOTA example:
# https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.6.1/nrf/samples/nrf9160/aws_fota/README.html
