Espruino and Amazon Alexa integration (implementation completed)

Try minify yourself.. at least some parts.. first place i would start is console.log. You have quite a lot of them and multiple times in a row.

In your setupId function for example:

  console.log("NAME: " + gFriendlyName);
  console.log("SERIAL: " + gSerialNumber);
  console.log("UUID: " + gUuid);

Try to combine this to a single console.log

  console.log("NAME: " + gFriendlyName, "SERIAL: " + gSerialNumber, "UUID: " + gUuid);

I am not aware of a minifier that does this for you without breaking everything.
Using arrow functions could scrape another few bytes. I could take a stab at minifying this
later today.

Edit

Offloading fixed strings etc. to a eeprom could help too.