Accessing Digi XBee-PRO®868 RF Modules..

Hello,
I'm looking for a library or sample code to access XBee-Pro 868 to

  1. Send data
  2. Receive data
  3. read RSSI values

in API mode. Unfortunatelly, existing XBee library ( rapp's library ) is not designed for this module and most of the functions are not working. many thanks for any help, reha