How To Manually Send Data to LightDB State and LightDB Stream

Originally published at: How To Manually Send Data to LightDB State and LightDB Stream - Golioth

We always recommend recommended connecting ESP32 devices to the Golioth Cloud with the Golioth Firmware SDK. We believe that is the lowest friction way of connecting a device to the internet. But sometimes I want to get under the hood and tinker, and I thought you might like to see how that works as well. We sometimes run into platforms that aren’t yet supported in Golioth, or have other requirements that means they would need to communicate directly to our CoAP endpoints. So in this post, I will demonstrate how to send data to Golioth’s LightDB Stream and LightDB State using only the ESP-IDF, not the Golioth Firmware SDK. We previously had shown how to connect to Golioth’s hello CoAP endpoint using an ESP32, which sends back a hello message every time the device connects to it. This post will build on that progress, so if you’d like to follow along, check out the setup that Miguel detailed in that post. Sending Data to LightDB State LightDB State is Golioth’s state-based database service, used for tracking an application’s resource state. In the last post, the CoAP endpoint was: coaps:// In order to send set or get resource state, we need to change the CoAP endpoint from coaps:// to coaps://{path=**}, where path can be any valid URI sub path. Now let’s change the example code according to the comments on line 431 in the coap_client_example_main.c. Variable idx will increment every time the while loop is executed (every 10 seconds), and the change to the value of idx will be visible in the Golioth Console. Observe the server’s OK response in the terminal: Sending Data to LightDB Stream LightDB Stream is Golioth’s…

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