message: The sending of the header FAILS when this line is uncommented.  Why?  Time to check my arduino and teensyduino environment.
diff: @@ -49,7 +49,7 @@ size_t BLE::sendMessage(const String &s)
  char buf[8];
  - //sprintf(buf, "%02X %02X %02X %02X %02X %02X %02X", header.charAt(0), header.charAt(1), header.charAt(2), header.charAt(3), header.charAt(4), header.charAt(5), header.charAt(6));
  + sprintf(buf, "%02X %02X %02X %02X %02X %02X %02X", header.charAt(0), header.charAt(1), header.charAt(2), header.charAt(3), header.charAt(4), header.charAt(5), header.charAt(6));
  Serial.println(buf);
  int a = sendString(header);
  