64bit address in xbee Arduino Library

[SurajitGithub1234]

Hi, I am using xbee library in SoftSerial mode and in API Mode to transmit from coordinator to an end device. ESP8266 is attached to the coordinator and i am analyzing the Received packet on Remote End Device Module in xCTU Software.
I was working fine when I tried to broadcast my message from Coordinator by writing:
XBeeAddress64 addr64 = XBeeAddress64(0x00000000, 0x0000FFFF); in arduino code.

But It is not transmitting when I put specific MAC Address of the remote end device module in coordinator's firmware:
XBeeAddress64 addr64 = XBeeAddress64(0x0013a200, 0x41e1e5be);
**I tried by both Lower Case and Upper Case.

In xCTU software, I configured both modules properly as Tx and Rx was working properly from both the modules in xCTU Software.

Please help me out.
Thanks.

[davidsainty]

That's probably too little information to go on - you'll likely need to do some more diagnostics. Maybe capture what the transmitting device responded with after sending your request.