Xbee s2 writing to a digital pin to multiple routers individually

XBee & XBee Gateway XBee - 802.15.4
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1

Hey. I am working with Xbee s2 and s2c and I am trying to find a way how to write digital high/low to multiple remote Xbee router devices.

int led = 13;

void setup(){
pinMode(led, OUTPUT);
Serial.begin(9600);
}

void loop(){
digitalWrite(led, HIGH);
setRemoteState(0x5);
delay(5000);
digitalWrite(led, LOW);
setRemoteState(0x4);
delay(5000);
}

void setRemoteState (char value){
Serial.write(0x7E); //start byte
Serial.write((byte)0x0); //high part of length (always zero)
Serial.write(0x10); //low part of length
Serial.write(0x17); //0x17 is remote AT command
Serial.write((byte)0x0); //frame ID set to zero for no reply

//ID of recipient, or use 0xFFFF for broadcast
Serial.write((byte)0x0);
Serial.write((byte)0x0);
Serial.write((byte)0x0);
Serial.write((byte)0x0);
Serial.write((byte)0x0);
Serial.write((byte)0x0);
Serial.write(0xFF);
Serial.write(0xFF);

//16 bit of recipient of 0xFFFE

Serial.write(0xFF);
Serial.write(0xFE);

Serial.write(0x02);

Serial.write(‘D’);
Serial.write(‘4’);

//command data in as many bytes
Serial.write(value);

//checksum
long sum = 0x17 + 0xFF + 0xFF + 0xFF + 0xFE + 0x02 + ‘D’ + ‘4’ + value;
Serial.write(0xFF - (sum & 0xFF));
}

I am using the following code and I am able to toggle the D4 pin of my router xbee device. I have connected another Xbee router device with the same PAN ID and its D4 is also toggling.

My question is how do I address them independently? I would like to choose which one do I want to toggle first and then delay till I toggle the second one?

I can identify the serial number high and low addresses of each router device and I have tried changing the following part of the code with the serial adress
Serial.write((byte)0x0); >>> 0x00
Serial.write((byte)0x0); >>> 0x13
Serial.write((byte)0x0); >>> 0xA2
Serial.write((byte)0x0); >>> 0x00
Serial.write((byte)0x0); >>> 0x40
Serial.write((byte)0x0); >>> 0xB8
Serial.write(0xFF); >>> 0xF4
Serial.write(0xFF); >>> 0x1F
https://imgur.com/a/fiP6lF6

After uploading the code, the digital pin is not toggling anymore. Is there wrong I am doing by adressing the Xbee device through its serial number?

2

If you’re changing the value in the address field, then the checksum will also change, so you need to dynamically calculate your checksum

this line:
//checksum
long sum = 0x17 + 0xFF + 0xFF + 0xFF + 0xFE + 0x02 + ‘D’ + ‘4’ + value;
Serial.write(0xFF - (sum & 0xFF));

3

It worked! Thanks a lot. What a silly mistake - i forgot to change the checksum after I have changed the address