Basic Zigbee API Mode for Mbed OS6 (v1.0.0)

This is a very basic implementation of the Xbee API for S2C RF modules. The implementation is for Mbed OS v6.17, for Arm MCUs which are supported by the Mbed compiler.

The basic library offers just two functions; Transmit (type 0x10) and Receive (type 0x90).
This programme was tested with the Nucleo-F411RE by STMicroelectronics.