• Strange error - can you post an issue on https://github.com/espruino/EspruinoTool­s with the exact contents of the file that wouldn't upload?

    But I'd say the setAdvertising method you'd used is best for low power since it doesn't need a connection. This might be a good way of getting the data into your Pi: http://www.espruino.com/Puck.js+Node-RED­

    And most likely it'll be the battery that won't take freezing temperatures, rather than the Puck - you might be able to find a special CR2032 meant for low temperatures I guess

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