feat(ncs-node01,ncs-node02,ncs-wedge): Setup namespace and interface config and switch configs for l1switch

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

sender-receiver-scripts/receiver.py

@@ -0,0 +1,67 @@
+import sys
+import time
+import threading
+from scapy.all import Ether, IP, UDP, send, sendp, Raw, sniff
+
+global initial_timestamp
+initial_timestamp = int(time.time() * 1000)
+
+# Simulated ACK sending function
+def send_ack(destination_IP, my_port, sender_port):
+    ack_data = ""
+    ###################
+    # With localhost:
+    ack_packet = IP(dst=destination_IP) / UDP(dport=sender_port, sport=my_port) / Raw(load=str(ack_data))
+    send(ack_packet, verbose=False)
+    ###################
+    # With netns:
+    # ack_packet = Ether(dst="00:00:00:00:00:04", src="00:00:00:00:00:01") / IP(dst="127.0.0.1") / UDP(dport=5551) / Raw(load=str(ack_data))
+    # sendp(ack_packet, verbose=False)
+    ###################
+    print(f"Sent ACK: {ack_data}")
+
+# Process incoming packets
+def process_packet(pkt):
+    ################### Save timestamps ###################
+    if Raw in pkt:
+        with open(save_file, "a") as f: # open as "a" for append
+            global initial_timestamp
+            receival_time = str(int(time.time() * 1000) - initial_timestamp) # time of arrival at receiver
+            send_time = pkt[Raw].load # time it was sent from the sender
+            ################### Conversion & error handling ###################
+            try:
+                send_time = int(send_time.decode("utf-8").split("X")[0]) # decode the payload and stop at "X"
+            except ValueError: # For the last packet without a timestamp but "END" as payload
+                print(f"END for {my_port}")
+                send_ack(destination_IP, my_port, sender_port)
+                return
+            except Exception as e:
+                print(f"Decoding error at {my_port}")
+                send_ack(destination_IP, my_port, sender_port)
+                return
+            ################### Write data ###################
+            aoi = int(receival_time) - send_time
+            f.write(f"{send_time},{receival_time},{aoi}\n")
+
+    send_ack(destination_IP, my_port, sender_port)
+
+# Main loop
+def main(destination_IP, my_port, sender_port):
+    ###################
+    # With localhost:
+    sniff(iface="lo", filter=f"udp and dst port {my_port}", prn=process_packet, store=False)
+    ###################
+    # With netns:
+    # sniff(iface="ns-g", filter=f"udp and dst port {my_port}", prn=process_packet, store=False)
+    ###################
+
+if __name__ == "__main__":
+    if len(sys.argv) != 4:
+        print("Usage: python receive_and_ack.py <destination_IP> <my_port> <sender_port>")
+        sys.exit(1)
+
+    destination_IP = sys.argv[1]                     # Clear
+    my_port = int(sys.argv[2])                       # Port to listen on
+    sender_port = int(sys.argv[3])                   # Port to send acks to
+    save_file = f"timestamps_{my_port}"
+    main(destination_IP, my_port, sender_port)