router-cc253x-std.hex
=====================
The standard formware without any additional diagnostic messages.

router-cc253x-diag.hex
======================
The firmware with additional diagnostic messages. This firmware sends the genBinaryValue report 
for every neighbor in a network. This report looks like:
	
{
description: '28069/0x00158D0001DE7964',
inactiveText: 'PARENT',
presentValue: 6,
relinquishDefault: 1,
minimumOffTime: 0
}

Where:

description  network and MAC address.
inactiveText  device role in a network.
presentValue  RSSI value of the last received packet (rxLqi).
relinquishDefault (optional)  path depth.
minimumOffTime (optional)  number of associated devices.

router-cc2531-diag-usb.hex
=========================
The firmware also sends additional diagnostic messages. But this firmware has USB support inside. 
If you'll connect this USB dongle to a computer a new virtual COM port will appear. The router will 
also dump diagnostic messages to this port.