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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
You sure it's not just that the device is connecting to a server that 'echoes' the characters it receives back?
Your usage of
"echo-protocol"makes me think that you might just be using an echo server example verbatim?