20 lines
540 B
Python
20 lines
540 B
Python
"""Quick diagnostic — just print what comes over serial."""
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import sys
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import serial
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if len(sys.argv) < 2:
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print(f"Usage: python {sys.argv[0]} <COM_PORT>")
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sys.exit(1)
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ser = serial.Serial(sys.argv[1], 115200, timeout=2)
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print(f"Listening on {sys.argv[1]}...")
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while True:
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raw = ser.readline()
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if raw:
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line = raw.decode("utf-8", errors="replace").strip()
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prefix = line[:20] if len(line) > 20 else line
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print(f"[{len(line):5d} chars] {prefix}...")
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else:
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print("(timeout — no data)")
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