test_hardware_serial_xbee.ino

// what we would like to see: first LED then second LED lights up on the WS2812 strip
// what we see instead: first LED (indicates startup), but then first 4 LEDs go on together, meaning xbee never talked back
// with SoftwareSerial(2,3) and the SparkFun shield switched to dline (vs UART), it does work.

#include <FastLED.h>

#include <XBee.h>
#include <Printers.h>

#define DATA_PIN 9
#define NUM_LEDS 4
CRGBArray<NUM_LEDS> leds;

// construct XBee object to be use as API to the xbee module
XBee xbee = XBee();

// sets the command to get the MY address
uint8_t myCmd[] = {'M', 'Y'};
// Sets the command to exit AT mode. 
uint8_t cnCmd[] = {'C','N'};

// Initialises the AT Request and Response.
AtCommandRequest atRequest = AtCommandRequest();
AtCommandResponse atResponse = AtCommandResponse();

void setup() {
  // put your setup code here, to run once:

  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);

  Serial.begin(9600);
  xbee.begin(Serial);

  // startup delay for xbee to wake-up (I'm desperate)
  delay(5000);
  // show that we're doing something
  leds[0] = CHSV(0.5, 255, 255);
  FastLED.show();
  
  addressRead();
}

void loop() {
  // put your main code here, to run repeatedly:

}

void addressRead()
{
  // Sets the AT Command to Serial Low Read.
  atRequest.setCommand(myCmd);
  
  // Sends the AT Command.
  xbee.send(atRequest);

  // Waits for a response and checks for the correct response code.
  if (xbee.readPacket(5000))
  {  
    if(xbee.getResponse().getApiId() == AT_COMMAND_RESPONSE)
    {
      xbee.getResponse().getAtCommandResponse(atResponse);
      
      if(atResponse.isOk())
      {
        // second LED means we could read MY from the xbee
        leds[1] += CHSV(128, 255, 192);
      }
    }
  }
  else {
    // ERROR: we keep on arriving here :( :( :(
    leds(0,3) = CHSV(128, 255, 192);
  }
  
  // Sets the AT Command to the Close Command.
  atRequest.setCommand(cnCmd);
  xbee.send(atRequest);

  FastLED.show();
}