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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Aifer
I run the test code on ESP32 module with 16M falsh.
In the test code, I store data just in a String var. And with no btoa(), set time interval to zero in setInterval, I get the same result.