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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.
@Gordon
How are you uploading code? Could you try uploading to flash and see if that gives you enough extra RAM?
Potentially we could rebuild with smaller buffers but we're at 4096 right now and 1024 doesn't work.
I'm afraid I don't know enough about mbedtls - you'd have to see if you could dig around. I think there's a possibility that the server having its own cert means that it's forced into using a cipher suite that the current build of mbedtls doesn't support?