Adding a NUL byte corrupts String administration

[SodaqMoja]

ArduinoCore-samd/cores/arduino/WString.cpp

Line 285 in e6df241

buf[0] = c;

When adding '\0' to a String, the length will be incremented, but the NUL character is not written to the underlying buffer. The reason is that in concat() a strcpy is used which does nothing in this case. But the length is still incremented.

[aentinger]

\0 entries are currently not supported, however this may change if and when arduino/ArduinoCore-API#97 is merged. Since those changes will be propagated via ArduinoCore-API integration into ArduinoCore-samd this issue can in fact be closed.