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Xbee garbage explained
My Xprotolab had two decoding lines, one was able to get data from my arduino, the other was not.
The very helpful Gabriel Anzziani who designed the Xprotolab, pointed out that one UART decoding line was done in software, and one in hardware.
That was enough for me to guess there was a timing problem in the NewSoftSerial arduino library
Eventually I traced it down to the new avr-gcc optimizing NewSoftSerial enough that it was just too fast