42 lines
1.1 KiB
Python
42 lines
1.1 KiB
Python
from fastapi import FastAPI
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from pymodbus.client import ModbusSerialClient
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import time
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import threading
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from queue import Queue
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serial_port = "COM4"
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baud_rate = 9600
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modbus_client = ModbusSerialClient(method='rtu', port=serial_port, baudrate=baud_rate)
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modbus_queue = Queue()
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def poll_modbus():
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while True:
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if modbus_client.connect():
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response = modbus_client.read_holding_registers(address=0, count=1, unit=1)
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if not response.isError():
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modbus_queue.put(response.registers[0])
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modbus_client.close()
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time.sleep(1)
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threading.Thread(target=poll_modbus, daemon=True).start()
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app = FastAPI()
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@app.get("/modbus_data")
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async def get_modbus_data():
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if not modbus_queue.empty():
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modbus_value = modbus_queue.get()
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return {"modbus_data": modbus_value}
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else:
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return {"error": "No data received"}
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@app.get("/")
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async def root():
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return {"message": "Welcome to Modbus with FastAPI"}
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if __name__ == "__main__":
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import uvicorn
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uvicorn.run(app, host="0.0.0.0", port=12345)
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