write 1-wire rom addres to variable

From a bunch of 1-wire devices I want to write the devices rom addresses to an array. I have tried many options, but obviously I don't have a clue how to do this right.

In the code below, in the device search loop I get the adress printed on the serial line as I expect it. But the printed output of the main loop indicates that I am way of in my method to store this address in an array....

#include <OneWire.h>
// http://www.pjrc.com/teensy/td_libs_OneWire.html
OneWire  ds(2);

void setup(void) {
   Serial.begin(9600);
   while (!Serial) {   
  }
}

unsigned char UIDs[12];
int indx=0;

void getDeviceAddresses(void)
{
 int i=0;
 byte present = 0;
 byte done = 0;
 byte data[12];
 byte addr[8];

 while ( !done )
 {
   if ( ds.search(addr) != 1)
   {
     Serial.print("No more addresses.\n");
     ds.reset_search();
     done = 1;
     delay(1000);
     indx=0;
     return;
   }
   else
   {
     Serial.print("Sensors");
     Serial.print(indx);
     Serial.print(" address is:\t");
     indx++;
    //read each byte in the address array
    for( i = 0; i < 8; i++) {
      //Serial.print("0x");
      if (addr[i] < 16) {
        Serial.print('0');   
      }
      // print each byte in the address array in hex format
      UIDs[indx]=(UIDs[indx]+(addr[i], HEX));                    // I guess this is not how to do it....
      Serial.print(addr[i], HEX);
    }
  }
  Serial.println();
 }
}

void loop (){
  getDeviceAddresses();
  int i=0;
  while (true) {
    for ( indx = 0; indx < 13; indx++) {
      Serial.println(UIDs[indx]);    
    }
   delay(4000);
  }
}

Sensors0 address is:    106C402502080064
Sensors1 address is:    101E3C25020800DE
Sensors2 address is:    10614C250208000F
Sensors3 address is:    10513325020800E0
Sensors4 address is:    10094B250208003C
Sensors5 address is:    104D342502080097
Sensors6 address is:    10FD4025020800E2
Sensors7 address is:    10534025020800AD
Sensors8 address is:    1047672502080083
No more addresses.
0
128
128
128
128
128
128
128
128
128
0
0
12

It looks like addr is an array of 8 bytes holding your address.

If you define as:

unsigned char UIDs[12][8];

Then on each pass through your function you have:

{
     Serial.print("Sensors");
     Serial.print(indx);
     Serial.print(" address is:\t");
     indx++;
    //read each byte in the address array
    for( i = 0; i < 8; i++) {
      //Serial.print("0x");
      if (addr[i] < 16) {
        Serial.print('0');   
      }
      // print each byte in the address array in hex format
      UIDs[indx][i] = addr[i];         
      Serial.print(addr[i], HEX);
    }
  }

And finally in your loop to print them:

for ( indx = 0; indx < 13; indx++) {
      for (int i=0; i<8; i++){
         if(UIDs[indx][i] < 16){
            Serial.print('0');
         }
      Serial.print(UIDs[indx][i], HEX);    
    }