SampleApp ZStack 1.4.3 with CC2430 message transmission problem

Other Parts Discussed in Thread: Z-STACK, CC2430

Greeting everyone, I am new to this forum. During my development on creating a WSN with CC2430 I encountered a problem. The WSN is composed of one enddevice and one coordinator, a RFID reader is connected to the end device via uart0 which I can read the ID from the RFID reader without problem, but when I try to transmit the ID via the SampleApp_SendFlashMessage() I cannot be sure it can success everytime. I know that the network condition may not be perfect, and it would miss packets, but I receive no error message using the if (DataRequest)...else (). Nothing in the else statement is executed when I see that coordinater can't receive the message via a RS232 printout. I am not sure about one thing : Is my message successfully sent? If not, are there any place in the stack I can be informed of the transmission error, so I can resend, or redone? Thanks you guys, I already dig up the datasheets, and Z-stack manuals, but couldn't find the answer. Best Regards, Rimusuki_Korusakofu