+"""This script uses T-REX stateless API to drive t-rex instance.
+
+Requirements:
+- T-REX: https://github.com/cisco-system-traffic-generator/trex-core
+ - compiled and running T-REX process (eg. ./t-rex-64 -i -c 4)
+ - trex_stl_lib.api library
+- Script must be executed on a node with T-REX instance
+- 2 interfaces must be configured in configuretion file /etc/trex_cfg.yaml
+
+##################### Example of /etc/trex_cfg.yaml ##########################
+- port_limit : 2 # numbers of ports to use
+ version : 2
+ interfaces : ["84:00.0","84:00.1"] # PCI address of interfaces
+ port_info : # set eth mac addr
+ - dest_mac : [0x90,0xe2,0xba,0x1f,0x97,0xd5] # port 0
+ src_mac : [0x90,0xe2,0xba,0x1f,0x97,0xd4]
+ - dest_mac : [0x90,0xe2,0xba,0x1f,0x97,0xd4] # port 1
+ src_mac : [0x90,0xe2,0xba,0x1f,0x97,0xd5]
+##############################################################################
+
+Functionality:
+1. Configure traffic on running T-REX instance
+2. Clear statistics on all ports
+3. Ctart traffic with specified duration
+4. Print statistics to stdout
+
+"""
+