Usage of a device running Espruino

Hi,

There shouldn't be an issue with intervals at all - you can do them years in advance.

If you connect via Bluetooth at a later point, does it then start working again?

You could try:

var log = "";
LoopbackB.on('data',function(d) { log = (log+d).substr(0,1000); });
LoopbackA.setConsole();

And then you can connect at some point later on and do print(log) - it'll then show you any messages that were written to the console while you were disconnected. It might give you a hint what's going on?

You can also use software serial on Espruino v2:

var s = new Serial();
s.setup(9600,{tx:D10})
LoopbackB.on('data',function(d) {s.write(d); });
LoopbackA.setConsole();

It's still a bit beta, but might be good enough for you to get realtime info on what's going on despite only having one serial port (which I guess you're using).