begin return true / false if device OK

[hallard]

begin method now check back that read config is same than just written, allowing to test if device is present on i2c bus

[fixus971]

Hi, I also need this function.
There is a bug whereby if an encoder is missing and I call updateStatus() All interrupt routines are launched
because
into that function:
_stat = readEncoderByte(REG_ESTATUS);
receive -1 = 255