import socket
from rest_framework.exceptions import ParseError
import json
import time

def get_tyy_data(*args):
    host, port = args[0], args[1]
    max_retries = 3
    retry_delay = 0.5

    for attempt in range(max_retries):
        sc = None
        try:
            sc = socket.socket()
            sc.connect((host, int(port)))
            sc.sendall(b"R")
            resp = sc.recv(1024)
            if not resp:
                raise ParseError("采集器返回空数据")
            elif len(resp) < 8:
                raise ParseError("设备未启动")
            json_data = resp[5:-4]
            json_str = json_data.decode('utf-8')
            res = json.loads(json_str)
            return res
        except ConnectionResetError:
                if attempt == max_retries - 1:
                    raise ParseError("采集器重置了连接，重试次数已达上限")
                time.sleep(retry_delay)
        except socket.timeout:
            raise ParseError("采集器连接超时")
        except Exception as e:
            raise ParseError(f"其他错误: {str(e)}")
        finally:
            if sc:
                try:
                    sc.close()
                except Exception:
                    pass

if __name__ == '__main__':
    print(get_tyy_data())