# One-off bench probe: isolated 4096B echo test (4KB through 2KB chip buffer).
# Connects to MCU :8080, sends 4096B increment pattern, waits for full echo.
import socket, sys, time

ip, port = "192.168.1.100", 8080
data = bytes((i & 0xFF) for i in range(4096))
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(15)
t0 = time.time()
s.connect((ip, port))
s.sendall(data)
rx = b""
first = None
while len(rx) < 4096:
    chunk = s.recv(4096 - len(rx))
    if not chunk:
        break
    if first is None:
        first = time.time()
    rx += chunk
elapsed = (time.time() - t0) * 1000
if len(rx) == 4096 and rx == data:
    print("PASS 4096B echo full match in %.1f ms (first byte %.1f ms)" % (elapsed, (first - t0) * 1000))
else:
    print("FAIL 4096B echo: got %d/4096 bytes after %.1f ms" % (len(rx), elapsed))
s.close()
sys.exit(0 if len(rx) == 4096 and rx == data else 1)