better logging for TX
show sleep in debug mode on tessel
make fake stream appear ever-eager for more data reads/writes
better execCommand logging
clarify variable parameter to avoid ambiguity with other `if (irq)` checks
better polling strategy on Tessel: instead of polling status, at least poll IRQ pin
add passive listen mode to test script
re-enable plain UTF-8 buffer toString
sample/test code to listen to same stuff as https://github.com/natevw/greenhouse/blob/master/greenhub.cpp#L42 + https://github.com/natevw/rooflux/blob/greenhouse/display.html#L65