Communication btw ZigBee devices using XBEE PYTHON API Library

I have a question pertaining to the use of the Xbee Python API. I want to send a synchronous unicast packet from a local device to a remote device. My local device is a zigbee module i have connected to a pc. The remote device consists of a zigbee module connected via usb to a raspberry pi. My question is how do I verify receipt of the data packet at the remote device? Based on my understanding from reading the documentation on the XBee library i have to install the library on both the pc and raspberry pi, and create an application on the local device to send the packet but after doing this is there any type of message or verification sent from the remote device that the packet was received?