Sending array from arduino to of

Hey bakercp,

thanks for the fast reply!
I tried the last solution and getting errors while compiling on arduino.
seems the types are not correct. any quick ideas on this?
I tried to convert the String to "const unsigned char" but this didnt workout fine so far.

SerialComSwitch.ino: In function ‘void writeSerialData()’:
SerialComSwitch.ino:59:32: error: invalid conversion from ‘const char*’ to ‘const uint8_t* {aka const unsigned char*}’ [-fpermissive]
In file included from /usr/share/arduino/hardware/arduino/cores/arduino/Stream.h:26:0,
                 from /usr/share/arduino/hardware/arduino/cores/arduino/HardwareSerial.h:28,
                 from /usr/share/arduino/hardware/arduino/cores/arduino/Arduino.h:193,
                 from SerialComSwitch.ino:1:
/usr/share/arduino/hardware/arduino/cores/arduino/Print.h:53:20: error:   initializing argument 1 of ‘virtual size_t Print::write(const uint8_t*, size_t)’ [-fpermissive]
     virtual size_t write(const uint8_t *buffer, size_t size);