iotespresso.com is a website for everything IoT. It is not restricted to just the ‘things’, i.e., IoT nodes, but is quite holistic. Think of any IoT company, and think of all the tech subsystems within that company – firmware, hardware, backend, frontend, data science, and others. All of those subsystems will find relevant content on this website.
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AWS IoT remove a Retained Message
Learn how to remove a retained message from AWS IoT Core using the AWS IoT MQTT Test Client (Console) and also programmatically using nodejs.
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AWS Lambda Function URLs
In April 2022, AWS made a powerful addition to Lambda: Function URLs. Learn all about them in this post, from enablement to configuration and best practices.
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Sending non-English text via HTTP in NodeJS
Have non-English characters (Hindi, Japanese, etc.) in your HTTP request body in Nodejs? Chances are that your requests are failing. Here’s the fix.
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How to use Mutex in ESP-IDF
Want to access critical resources from multiple threads in ESP32. Learn how to use Mutexes in IDF for achieving just that.
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A beginner’s guide to HTTPS
Ever wondered how your credit card number is securely transmitted over the internet? Ever wondered how HTTPS works on a high level? Read on to find out.
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ESP32 Arduino time operations
This article can act as a reference whenever you need to perform time operations on ESP32 in the Arduino IDE (bookmark it!).
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ESP32 – Free memory occupied by JSON objects
Observing your code running out of memory after a few iterations? Memory leaks caused by JSON objects might be the culprits. Learn how to fix them.
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How to use cookies in backend API calls
Getting a 302 status code with the “Object moved to here” response when making an API call? Perhaps you are missing a cookie. Learn how to fix that.
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A beginner’s guide to MQTT
What is MQTT, and why is it so popular in IoT applications? What are the terms surrounding MQTT that you should be aware of? Read this post to find out.