Delay with the define WAITFORSERIAL in setup() leads to problem

If we try to use the example scetch the delay in the loop() results in synchronization problems with our firmata library from https://github.com/kurbatov/firmata4j. If we could just disable per default the debug prints it results in correctly communicating with Android device. Opened a PR for it -> https://github.com/adafruit/Adafruit_BLE_PinIO/pull/15

Start with the example sketch and inspect the WAITFORSERIAL definition in setup() and the delay in loop(). Compare the proposed change in PR #15, then verify that disabling debug prints by default avoids the firmata4j and Android synchronization problem.

Written by the indexing model from the issue text.