117 lines
3.8 KiB
Python
117 lines
3.8 KiB
Python
# pip install paho-mqtt
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import json
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import re
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import time
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from paho.mqtt import client as mqtt
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# ========= 使用者設定 =========
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BROKER_HOST = "169.254.11.130"
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BROKER_PORT = 1886
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TOPIC = "topic_plc_and_py_for_AXIS"
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QOS = 1 # 建議測試用 1
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# ============================
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# 全域狀態（方便觀察最新值）
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state = {
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"BUTTON_Y": None,
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"Forward_RPM": None,
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"UPDown_RPM": None,
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}
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def _robust_json_parse(raw: str):
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"""
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將 PLC 端常見的非標準 JSON 嘗試修正後解析為 dict。
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例：'{Forward_RPM:1500,UPDown_RPM:800}' -> {'Forward_RPM':1500,'UPDown_RPM':800}
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也會把 TRUE/FALSE -> true/false
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"""
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s = raw.strip()
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# 去掉最外層引號（若有）
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if (s.startswith("'") and s.endswith("'")) or (s.startswith('"') and s.endswith('"')):
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s = s[1:-1].strip()
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# PLC 常見布林大寫 -> JSON 規範小寫
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s = s.replace("TRUE", "true").replace("FALSE", "false")
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# 自動補 key 的雙引號：{key: -> {"key":
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s = re.sub(r'([{,]\s*)([A-Za-z_]\w*)\s*:', r'\1"\2":', s)
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# 轉單引號為雙引號（若 payload 用了單引號包字串）
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# 放在補 key 後，避免 key 的引號再被替換
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s = s.replace("'", '"')
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return json.loads(s)
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def on_connect(client: mqtt.Client, userdata, flags, reason_code, properties=None):
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"""
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連上 Broker 後自動訂閱 Topic。
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paho-mqtt 2.x 的 on_connect 第四個參數是 reason_code（非 rc），名稱略有不同。
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"""
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if reason_code == 0:
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print(f"✅ 已連線到 MQTT Broker {BROKER_HOST}:{BROKER_PORT}")
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client.subscribe(TOPIC, qos=QOS)
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print(f"📡 已訂閱 Topic: {TOPIC}（QoS={QOS}）")
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else:
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print(f"❌ 連線失敗，reason_code={reason_code}")
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def on_message(client: mqtt.Client, userdata, msg: mqtt.MQTTMessage):
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payload_raw = msg.payload.decode("utf-8", errors="replace")
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print(f"\n📥 收到原始訊息：{payload_raw}")
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# 先試標準 JSON，失敗再用容錯解析
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try:
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data = json.loads(payload_raw)
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except json.JSONDecodeError:
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try:
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data = _robust_json_parse(payload_raw)
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except Exception as e:
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print(f"❌ 無法解析為 JSON：{payload_raw} ；錯誤：{e}")
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return
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# 只更新我們關心的欄位（有傳才改）
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for key in ("BUTTON_Y", "Forward_RPM", "UPDown_RPM"):
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if key in data:
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state[key] = data[key]
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print(
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f"✅ 解析後資料：{data}\n"
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f"📊 目前狀態：BUTTON_Y={state['BUTTON_Y']}, "
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f"Forward_RPM={state['Forward_RPM']}, UPDown_RPM={state['UPDown_RPM']}"
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)
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def on_disconnect(client: mqtt.Client, userdata, reason_code, properties=None):
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print(f"🔌 已斷線，reason_code={reason_code}")
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def sub_to_plc(broker_host: str, broker_port: int, topic: str):
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client = mqtt.Client(client_id="py_sub_plc_test", protocol=mqtt.MQTTv311)
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# 如需帳密或 TLS，在這裡設定
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# client.username_pw_set("user", "pass")
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# client.tls_set(ca_certs="ca.pem")
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# 自動重連延遲（paho-mqtt 2.x）
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client.reconnect_delay_set(min_delay=1, max_delay=10)
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client.on_connect = on_connect
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client.on_message = on_message
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client.on_disconnect = on_disconnect
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# 先連線，再進入 loop
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client.connect(broker_host, broker_port, keepalive=60)
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try:
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# loop_forever 會阻塞執行緒，內建自動重連
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client.loop_forever()
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except KeyboardInterrupt:
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print("\n🛑 收到中斷訊號，準備斷線...")
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finally:
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try:
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client.disconnect()
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except Exception:
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pass
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if __name__ == "__main__":
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print("🚀 啟動 MQTT 訂閱器...")
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print(f"Broker={BROKER_HOST}:{BROKER_PORT}, Topic={TOPIC}, QoS={QOS}")
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sub_to_plc(BROKER_HOST, BROKER_PORT, TOPIC)
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