Test passed on MEGA2560, DUE.
Sdk is use the HardwareSerial for serial comminucate, you must config the correct serial_port is Serial1, rtsPin is 4 pin. you can init like this.
#include <adra_api.h>
AdraApi adraApi(1,4);
AdraApi Constructor is
AdraApi(uint8_t serial_port, uint8_t rts);
After that, you need to set the baud for connect. for example, baud is 115200. (if you need to change the baud rate, you can refer change the baud rate with Adra Assistant.)
adraApi.connect(115200);
Then, you can comminucate with adra. for example, get the adra's current position.
float buf;
int8_t ret = adraApi.get_pos_current(1,&buf); //1 is the id of adra
Serial.println(ret);
Serial.println(buf);
All the api is in the adra_api.h
Download the SDK ,and unzip it to the libraries path of Arduino. Then restart Arduino IDE. Then you can see the sdk library in Sketch->Include Library->ADRA_SDK_ARDUINO
You can reference example in the sdk. Find the exmaple in File->Examples->ADRA_SDK_ARDUINO