Unicast using xbee-arduino lib in API mode

I must see something over the head. My setup works using broadcasting addressing

XBeeAddress64 ALL_MAC = XBeeAddress64(0x0,0xFFFF);

xbee_tx = ZBTxRequest(ALL_MAC, xbee_payload, min(message.length(), xbee_buffer_size)+1);
xbee.send(xbee_tx);

but once I try unicast, nothing arrives on the reading node

XBeeAddress64 SPOOKY_MAC = XBeeAddress64(0x0013A200,0x409453AA);

xbee_tx = ZBTxRequest(SPOOKY_MAC, xbee_payload, min(message.length(), xbee_buffer_size)+1);
xbee.send(xbee_tx);

For the XBees Series2 I use ZNET 2.5 COORDINATOR and ROUTER/END DEVICE in API mode, but havent hardcoded any DH/DL addressing in the configuration. Looking at the threads in here, I cant see, what I'm doing different... what am I'm not aware of?

but havent hardcoded any DH/DL addressing in the configuration.

Each series 2 XBee comes with DH and DL values defined. Those are the values that you need to use in the code to talk to a specific XBee.

PaulS:

but havent hardcoded any DH/DL addressing in the configuration.

Each series 2 XBee comes with DH and DL values defined. Those are the values that you need to use in the code to talk to a specific XBee.

It looks like he has done that,

XBeeAddress64 SPOOKY_MAC = XBeeAddress64(0x0013A200,0x409453AA);

He is correct in saying that DH and DL do not need to be set, e.g. using X-CTU or whatever.,