Passing string to uint8_t array in arduino

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I have to send an intiger counter as 'num' through ZigBee(API mode) from arduino. For this purpose I have to convert this integer to String and then to uint8_t array as it is needed in API frame to transmit.

Apart from other details I've converted my integer to string like,

String str;
int num = 0;
char  cstr[16];

void loop() {
  num++;
  str = String(num);
  str.toCharArray(cstr,16);

  Serial.println(cstr);  // this shows the correct result, means int is converted to String correctly

  uint8_t data[] = {cstr}; // passing String to uint8_t array

  XBeeAddress64 addr64 = XBeeAddress64();
  addr64.setMsb(0x00000000);
  addr64.setLsb(0x00000000); 
  ZBTxRequest zbTx = ZBTxRequest(addr64, data, sizeof(data));
  xbee.send(zbTx);

  int count = sizeof(data);
    for (int i = 0; i < count; i++) {
      if (i == (count-1)) {
      Serial.print(data[i]);   // here it prints "104" of ASCII which is equal to "h"       
      }
    } 
}

It also transmit it as like that Serial print i.e. ('104'). Please point out if I am making any mistake and guide me if I did't doing it as required.