How to send a "break" condition to the UART of a RN2483

Thanks, that's handy to know though.

Some other potential ideas:

• You could just poke the data straight into Serial1 without having to get the RN2483 involved - I think just Serial1.emit('data','\r\n') should sort it.
  
• Serial ports can forward framing errors to the code if configured to do so: http://www.espruino.com/Reference#l_Serial_setup - not sure of that helps you (I can't remember if adding framing errors stops the extra characters from being reported)